Nbs specification (updated for contract)

THE OLD STATION
STOKESLEY
MIDDLESBROUGH
TS9 7AB
August 2014
Page 1 of 266 Project Fitzroy
specification for contract

of 266 Project Fitzroy

Table of Contents
Title Page
7Brick/ block wallingF10
16Natural stone/ ashlar walling/ dressingsF21
21Accessories/ sundry items for brick/ block/ stone wallingF30
30Precast concrete sills/ lintels/ copings/ featuresF31
34Carpentry/ timber framing/ first fixingG20
42Curtain wallingH11
59Structural glass assembliesH13
66Precast concrete and glass lens/ paver rooflights/ floor lights/
pavement lights/ security panels
H14
69Natural slatingH62
76Lead sheet coverings/ flashingsH71
83Aluminium strip/ sheet coverings/ flashingsH72
88Flexible sheet waterproofing/ damp proofingJ40
92Reinforced bitumen membrane roof coveringsJ41
107Single layer polymeric sheet roof coveringsJ42
119Plasterboard dry linings/ partitions/ ceilingsK10
128Rigid sheet flooring/ sheathing/ decking/ sarking/ linings/
casings
K11
131Panel cubicles/ duct and wall linings/ screensK32
133Demountable suspended ceilingsK40
141Windows/ Rooflights/ Screens/ LouvresL10
150Doors/ shutters/ hatchesL20
164Stairs/ ladders/ walkways/ handrails/ balustradesL30
168General glazingL40
171Cement based levelling/ wearing screedsM10
182Plastered/ Rendered/ Roughcast coatingsM20

188Rubber/ plastics/ cork/ lino/ carpet tiling/ sheetingM50
197Painting/clear finishingM60
204Intumescent coatings for fire protection of steelworkM61
209General fixtures/ furnishings/ equipmentN10
214Sanitary appliances and fittingsN13
217Sundry insulation/ proofing workP10
220Fire stopping systemsP12
226Unframed isolated trims/ skirtings/ sundry itemsP20
229FencingQ40
234Rainwater drainage systemsR10
239Purpose made joineryZ10
242Purpose made metalworkZ11
247Preservative/ fire retardant treatmentZ12
250Fixings and adhesivesZ20
254MortarsZ21
257SealantsZ22
259Powder coatingsZ31
264AnodizingZ33

2SealantsZ22
2Powder coatingsZ31
2AnodizingZ33

F10 Brick/ block walling
To be read with Preliminaries/ General conditions.
95 SIMILAR EQUIVALENT PRODUCTS
• Wherever products are specified by proprietary name and the phrase 'or equivalent' is not
included, it is to be deemed included.
• Demonstration of equivalence is the responsibility of the sub-contractor/supplier.
TYPES OF WALLING
110 CLAY FACING BRICKWORK Red Brick - part of chequerboard details and contrasting
banding in Education courtyards - see design intent document
• Bricks: To BS EN 771-1.
- Manufacturer: tbc.
Product reference: Ashwell Red Multi handmade.
- Recycled content: manufacturers standard.
- Special shapes: As shown on drawings.
• Mortar: As section Z21.
- Standard: To BS EN 998-2.
- Mix: 1:1:6 cement:lime:sand (mortar class 4).
- Additional requirements: Coloured mortar. Colour reference to be advised .
• Bond: Half lap stretcher generally, patterned brick design as architects details .
• Joints: Bucket handle.
• Features: special shaped bricks / solid bricks to reveals and snapped header details - see
detail 31-002
Chequerboard pattern to main elevation. Engineer to advise on joint ties at vertical
junctions.
110A CLAY FACING BRICKWORK Main Buff brick
• Bricks: To BS EN 771-1.
- Manufacturer: tbc .
Product reference: tbc.
- Recycled content: Manufacturer's standard.
- Special shapes: To window reveals As shown on drawing 31-002. .
- Mix: 1:1:6 cement:lime:sand (mortar class 4).
- Additional requirements: Coloured mortar. Colour reference to be advised .
• Bond: Half lap stretcher generally, patterned brick design as architects details .
• Joints: Bucket handle.
• Features: special shaped bricks / solid bricks to reveals and snapped header details - see
detail 31-002
Chequerboard pattern to main elevation. Engineer to advise on joint ties at vertcial
junctions.
Page 7 of 266 F10 Project Fitzroy

355 CONCRETE COMMON BLOCKWORK BELOW GROUND
• Blocks: To BS EN 771-3.
- Manufacturer: Contractor's choice.
Product reference: Submit proposals.
- Configuration: solid - Group 1.
- Compressive strength:
Mean value: 7.3 N/mm2.
Characteristic value: Not applicable.
Category: II.
- Freeze/ Thaw resistance: Frost resistant.
- Thermal properties: Thermal conductivity: 0.41 W/mK.
- Recycled content: 100%.
- Work sizes (length x width x height): 440mm x 215mm x 140mm.
Tolerance category: D1.
- Special shapes: None.
- Additional requirements: Reaction to fire class: A1.
- Mix: 1:3 masonry cement:sand 6 N/mm2 (mortar class 6) Strcural engineer to advise on
sulphate resisting requirements.
- Additional requirements: None.
• Bond: Half lap stretcher.
355A CONCRETE COMMON BLOCKWORK MEDIUM DENSITY INNER LEAF OF CAVITY
WALLS
- Manufacturer: Plascon or equal approved.
Product reference: Multicore solid .
- Min density ; 1475kg/m3
Category: II.
- Freeze/ Thaw resistance: Frost resistant.
- Mix: 1:1:6 cement:lime:sand 4 N/mm2 (mortar class 4).
- Additional requirements: Internal blockwork is utilised in conjunction with plastered
surfaces to acheive the acoustic reduction required as detailed in the acoustic strategy.
Quality of workmanship shall be maintained at a high standrad to ensure that air paths
are avoided. read in conjunction with acoustic strategy prior to blockwork selection .

355B CONCRETE COMMON BLOCKWORK IN LIFT SHAFTS
- Manufacturer: Contractor's choice.
Product reference: Submit proposals.
Characteristic value: Not applicable.
Category: II.
- Freeze/ Thaw resistance: Not applicable.
- Additional requirements: Lift shaft wall construction to be confirmed by structural
engineer. Either 2 leaves of 100m or block laid on side.
355C CONCRETE COMMON BLOCKWORK MEDIUM DENSITY IN PARTITIONS
- Manufacturer: Plascon or equal approved.
Product reference: Multicore solid.
- Configuration: Group 1 solid.
- Min density 1475kg/m3
Category: II.
- Freeze/ Thaw resistance: Not applicable.
- Additional requirements: Reaction to fire class: A1. .
- Additional requirements: Internal blockwork is utilised in conjunction with plastered
surfaces to acheive the acoustic reduction required as detailed in the acoustic strategy.
Quality of workmanship shall be maintained at a high standard to ensure that air paths
are avoided. read in conjunction with acoustic strategy prior to blockwork selection .
TESTING
400 HARD LANDSCAPING MATERIALS SPECIFICATION
• Minimum BRE ?Green Guide to Specification Online? rating: A+.

410 COMPRESSIVE STRENGTH OF MORTAR FOR EACH WALLING TYPE
• Testing authority: A UKAS Accredited laboratory.
• Test method: BS EN 1015-11.
• Preliminary tests procedure: As follows:
- Specimens:
Number of specimens: 6.
Type: 40 x 40 x 100 mm prisms.
Preparation: At least six weeks before walling commences.
- Specimen testing: Half of specimens at 7 days. Remainder at 28 days.
Retarded mixes: Extend curing periods to include retardation period.
- Response to result: If mean compressive strength at 28 days is not within the range
given below repeat tests with more suitable sand or next higher mortar class.
• Site tests procedure: As follows.
- Number of specimens: Six per 150m? of walling or per storey whichever the more
frequent.
- Specimen types: As preliminary test, but prepared during construction.
- Specimen testing: Half of specimens at 7 days. Remainder at 28 days.
Retarded mixes: Extend curing periods to include retardation period.
• Required test mean compressive strength at 28 days (N/mm?): To be within the following
range:
- Walling type: F10/110.
Preliminary tests minimum (N/mm?): To be advised by structural engineer.
Preliminary tests maximum (N/mm?): To be advised by structural engineer.
Site tests minimum (N/mm?): To be advised by structural engineer.
Site tests maximum (N/mm?): To be advised by structural engineer.
• Results: Submit.
420 SITE STORAGE
• Bricks shall be inspected on delivery, carefully unloaded to minimise damage and set
directly onto a well-drained, puddle free level area, not in contact with soil. Pay special
attention to the storage and handling of Glazed products as the faces are easily damaged.
• All products should be immediately protected from rain and snow.
• It is important not to overload floor slabs or scaffolding with bricks.
• Store units in stable stacks clear of the ground and clearly identified by type, strength,
grade, etc.
• Protect from adverse weather and keep clean and dry.
WORKMANSHIP GENERALLY
430 CONDITIONING OF CLAY AND CALCIUM SILICATE BRICKS AND CLAY BLOCKS
• Bricks and blocks delivered warm from manufacturing process: Do not use until cold.
• Absorbent bricks in warm weather: Wet to reduce suction. Do not soak.
440 CONDITIONING OF CONCRETE BRICKS/ BLOCKS
• Autoclaved concrete bricks/ blocks delivered warm from manufacturing process: Do not
use.
• Age of nonautoclaved concrete bricks/ blocks: Do not use until at least four weeks old.
• Avoidance of suction in concrete bricks/ blocks: Do not wet.
- Use of water retaining mortar admixture: Submit details.

460A MORTAR GROUPS
• Mix proportions: For a specified group select a mix design from the following:
- Group 1:
1:0-0.25:3 (Portland cement:lime:sand with or without air entraining additive).
1:3 (Portland cement:sand and air entraining additive).
- Group 2:
1:0.5:4-5 (Portland cement:lime:sand with or without air entraining additive).
1:3 (masonry cement:sand containing Portland cement and lime in approximate ratio 1:1,
and an air entraining additive).
1:2.5-3.5 (masonry cement:sand containing Portland cement and inorganic materials
other than lime and air entraining additive).
1:3-4 (Portland cement:sand and air entraining additive.)
- Group 3:
1:1:5-6 (Portland cement:lime:sand with or without air entraining additive).
1:3.5-4 (masonry cement:sand containing Portland cement and lime in approximate ratio
1:1, and an air entraining additive).
1:4-5 (masonry cement:sand containing Portland cement and inorganic materials other
than lime and air entraining additive).
1:5-6 (Portland cement:sand and air entraining additive).
- Group 4:
1:2:8-9 (Portland cement:lime:sand with or without air entraining additive).
1:4.5 (masonry cement:sand containing Portland cement and lime in approximate ratio
1:1, and an air entraining additive).
1:5.5-6.5 (masonry cement:sand containing Portland cement and inorganic materials
other than lime and air entraining additive).
1:7-8 (Portland cement:sand and air entraining additive).
• Batching: Mix proportions by volume.
• Mortar type: Continuous throughout any one type of masonry work.
500 LAYING GENERALLY
• Mortar joints: Fill vertical joints. Lay bricks, solid and cellular blocks on a full bed.
• AAC block thin mortar adhesive and gypsum block adhesive joints: Fill vertical joints. Lay
blocks on a full bed.
• Clay block joints:
- Thin layer mortar: Lay blocks on a full bed.
- Interlocking perpends: Butted.
• Bond where not specified: Half lap stretcher.
• Vertical joints in brick and concrete block facework: Even widths. Plumb at every fifth cross
joint.
520A ACCURACY
• Courses: Level and true to line.
• Faces, angles and features: Plumb.
• Permissible deviations:
- Position in plan of any point in
relation to the specified building
reference line and/ or point at
the same level 10 mm.
- Straightness in any 5 m length 5 mm.
- Verticality up to 3 m height 10 mm.
- Verticality up to 7 m height 14 mm.
- Overall thickness of walls 10 mm.
- Level of bed joints up to 5 m
(brick masonry) 11 mm.
- Level of bed joints up to 5 m
(block masonry) 13 mm.

535 HEIGHT OF LIFTS IN WALLING USING CEMENT GAUGED OR HYDRAULIC LIME
MORTAR
• Quoins and advance work: Rack back.
• Lift height (maximum): 1.2 m above any other part of work at any time.
• Daily lift height (maximum): 1.5 m for any one leaf.
545 LEVELLING OF SEPARATE LEAVES
• Locations for equal levelling of cavity wall leaves: As follows:
- Every course containing vertical twist type ties or other rigid ties.
- Every third tie course for double triangle/ butterfly ties.
- Courses in which lintels are to be bedded.
560A COURSING BRICKWORK
• Brickwork, to work sizes 215x102x65mm, should be set out horizontally 4 bricks to 900mm
(co-ordinating size) in stretcher bond and vertically to gauge 4 courses to 300mm to match
the appearance of the reference panel.
Setting out should also ensure satisfactory junctions and joints with adjoining or built in
elements and components.
580 LAYING FROGGED BRICKS
• Single frogged bricks: Frog uppermost.
• Double frogged bricks: Larger frog uppermost.
• Frog cavity: Fill with mortar.
595 LINTELS
• Bearing: Ensure full length masonry units occur immediately under lintel ends.
635 JOINTING
• Profile: Consistent in appearance.
645 ACCESSIBLE JOINTS NOT EXPOSED TO VIEW
• Jointing: Struck flush as work proceeds.
665 POINTING brick facework
• Joint preparation: Remove debris. Dampen surface.
- Mix: 1:1:6 cement:lime:sand 4 N/mm? (mortar class 4).
- Additional requirements: Natural / coloured mortar mix to be agreed following
construction of sample panel.
• Profile: Bucket handle.
671 FIRE STOPPING
• Avoidance of fire and smoke penetration: Fit tightly between cavity barriers and masonry.
Leave no gaps.

690 ADVERSE WEATHER
• General: Do not use frozen materials or lay on frozen surfaces.
• Air temperature requirements: Do not lay bricks/ blocks:
- In cement gauged mortars when at or below 3?C and falling or unless it is at least 1?C
and rising.
- In hydraulic lime:sand mortars when at or below 5?C and falling or below 3?C and rising.
- In thin joint mortar glue when outside the limits set by the mortar manufacturer.
• Temperature of walling during curing: Above freezing until hardened.
• Newly erected walling: Protect at all times from:
- Rain and snow.
- Drying out too rapidly in hot conditions and in drying winds.
ADDITIONAL REQUIREMENTS FOR FACEWORK
710 THE TERM FACEWORK
• Definition: Applicable in this specification to brick/ block walling finished fair.
- Painted facework: The only requirement to be waived is that relating to colour.
730 BRICK/ CONCRETE BLOCK SAMPLES
• General: Before placing orders with suppliers submit for approval of appearance labelled
samples of the following: Bricks as in clause F10/110 .
• Selection of samples: Representative of the range in variation of appearance.
740 FINISHED MASONRY WORK REFERENCE PANELS
• General: Before proceeding to construct the following walling types, construct panels as
specified. Give notice when panels are dry.
• Selection of masonry units: Reasonably representative of the average quality of the whole
order to be delivered .
• Panel types:
- Walling type: F10/110 .
Location: On site. Final location to be agreed .
Size: 1.5 x 1.5 m .
Other requirements: The reference panel should be positioned in a clean, well-lit area
and be available for the duration of the contract. A viewing distance of 3 metres must be
allowed .
750 COLOUR CONSISTENCY OF MASONRY UNITS
• Colour range: Submit proposals of methods taken to ensure that units are of consistent
and even appearance within deliveries.
• Conformity: Check each delivery for consistency of appearance with previous deliveries
and with approved reference panels; do not use if variation is excessive.
• Finished work: Free from patches, horizontal stripes and racking back marks.
760 APPEARANCE
• Brick/ block selection: Do not use units with damaged faces or arrises.
• Cut masonry units: Where cut faces or edges are exposed cut with table masonry saw.
• Quality control: Lay masonry units to match relevant reference panels.
- Setting out: To produce satisfactory junctions and joints with built-in elements and
components.
- Coursing: Evenly spaced using gauge rods.
• Lifts: Complete in one operation.
• Methods of protecting facework: Submit proposals.

780 GROUND LEVEL
• Commencement of facework: Not less than 150 mm below finished level of adjoining
ground or external works level.
790 PUTLOG SCAFFOLDING
• Use: Not permitted in facework.
800 TOOTHED BOND
• New and existing facework in same plane: Bond together at every course to achieve
continuity.
830 CLEANLINESS
• Facework: Keep clean.
• Mortar on facework: Allow to dry before removing with stiff bristled brush.
• Removal of marks and stains: Rubbing not permitted.

F21
Natural stone/ ashlar walling/ dressings

F21 Natural stone/ ashlar walling/ dressings
TYPES OF WALLING/ DRESSINGS
110 ASHLAR WALLING
• Stone: To BS EN 771-6.
- Name (traditional): Stoke ground top bed Bath stone.
- Petrological family: Jurassic Limestone.
- Colour: Pale cream / Buff.
- Origin: tbc.
- Finish: Sawn and honed.
- Supplier: tbc.
- Unit dimension tolerances: Category D2.
Mean value (minimum): MPa 13.80.
Characteristic value (minimum): Not applicable.
Category: II.
- Open porosity: 22.95%.
- Additional requirements: Apparent density: 1988 kg/m2.
- Quality: Free from vents, cracks, fissures, discolouration, or other defects deleterious to
strength, durability or appearance. Before delivery to site, season thoroughly, dress and
work in accordance with shop drawings prepared by supplier.
- Mix: to be agreed with specialist stone supplier.
- Sand: To BS EN 13139; crushed stone with grading to approval .
- Additional requirements: FINAL MORTAR MIX to be agreed following sample panel for
approval.
• Bond: As shown on drawings.
• Joints: Flush.
- Width: 3 mm.
- Pointing: Brushed. As clause 390.
• Other requirements: Sizes as indicated on architects drawings - read in conjunction with
architects drawings and deisgn intent document.

110A ASHLAR DRESSED STONE LINTELS AND CILLS and copings
• Stone: To BS EN 771-6.
- Name (traditional): Stoke ground top bed Bath stone.
- Petrological family: Jurassic Limestone.
- Colour: Pale cream / Buff.
- Origin: tbc.
- Finish: Sawn and honed.
- Supplier: -.
- Unit dimension tolerances: Category D2.
Mean value (minimum): MPa 13.80.
Characteristic value (minimum): Not applicable.
Category: II.
- Open porosity: 22.95%.
- Additional requirements: Apparent density:1988 kg/m?.
- Quality: Free from vents, cracks, fissures, discolouration, or other defects deleterious to
strength, durability or appearance. Before delivery to site, season thoroughly, dress and
work in accordance with shop drawings prepared by supplier.
- Mix: to be advised by specilaist stone supplier .
- Sand: To BS EN 13139; crushed stone with grading to approval .
- Additional requirements: Final mortar mix to be agreed following sample panel for
approval.
• Bond: As shown on drawings.
• Joints: Flush.
- Width: to be agreed.
- Pointing: Brushed. As clause 390.
• Other requirements: Sizes as indicated on architects drawings and design intent document.
GENERAL PRODUCTION
240 STONE SAMPLES
• Submit: Labelled samples of dressed stone or arrange for samples which represent the
range of variation in appearance to be inspected.
- Timing: Before placing orders.
250 CUTTING AND DRESSING OF STONE
• Timing: After seasoning but before delivery to site.
• Accuracy:
- Exposed and joint surfaces: Square, true planes free from hollow or rough areas.
- Dimensions: Maintain specified joint widths.
• Orientation for natural bed of stones: Appropriate to properties of stones and positions in
walling/ dressings.
260 IDENTIFICATION OF STONE UNITS
• Marking: Clearly and indelibly on concealed faces to indicate the natural bed and position
in the finished work.
270 INSPECTION OF STONE UNITS
• Give notice: Before despatch to site, at appropriate stages of production.
280 SAND SAMPLES
• Submit: Representative samples for approval of colour and grading.
- Timing: Before placing orders.

LAYING AND JOINTING
300 REFERENCE PANELS
• General: Complete areas of specified walling types and obtain approval of appearance
before proceeding further.
• Walling type:
- Location: to be agreed .
- Size: at least 3m long .
- Features: to include window cill, lintel and reveal .
315 ADVERSE WEATHER
• General: Do not use frozen materials or lay on frozen surfaces.
• Air temperature: Do not lay stones:
- In cement gauged mortars: At or below 3?C and falling or below 1?C and rising.
- In hydraulic lime:sand mortars: At or below 5?C and falling or below 3?C and rising.
• Temperature of walling during curing: Above freezing until mortar hardened.
• Newly erected walling: Protect at all times from:
- Rain and snow.
- Drying out too rapidly in hot conditions and in drying winds.
325 LAYING GENERALLY
• Stone selection: Do not use units with damaged faces or arrises.
• Accuracy:
- Courses: Level and true to line.
- Faces, angles and features: Plumb.
- Setting out: Achieve satisfactory junctions and joints with adjoining or built-in elements
and components.
• Absorbent stones: Dampen in warm weather to reduce suction. Do not soak.
• Mortar joints:
- Laying: Full bed of mortar with all joints and voids filled.
- Temporary distance pieces: Lead or stainless steel. Remove when mortar is sufficiently
strong.
- Appearance: Neat and consistent.
• Cleanliness: Keep facework clean. Rubbing and other abrasive or chemical cleaning
methods to remove marks and stains not permitted.
330 WALLING BELOW GROUND LEVEL
• Extent of facework below finished level of adjoining ground or external works (minimum):
150 mm.
340 PUTLOG SCAFFOLDING
• Use: Not permitted.
350 ONE PIECE SILLS/ THRESHOLDS
• Bed joints: Leave open except under:
- End bearings.
- Masonry mullions.
• Pointing on completion: Mortar to match adjacent work.
360 OPENINGS
• Method of forming: Rigid templates, accurately fabricated to the required size.
370 JOGGLE JOINTS
• General: Fill with bedding mortar. Tamp to expel air.

390 POINTING
• Joint preparation: Rake out to depth of 7-10 mm as work proceeds. Remove debris.
Dampen surface.
• Mortar application: Neat and consistent.
410 SUPPORT OF EXISTING WORK
• Joint above inserted lintel or masonry: Fully consolidated with semidry mortar to support
existing structure.

F30
Accessories/ sundry items for brick/ block/ stone
walling

F30 Accessories/ sundry items for brick/ block/ stone walling
CAVITIES
110 CONCRETE FILL TO BASE OF CAVITY
• Concrete generally: To BS EN 206-1 and BS 8500-2.
- Designated concrete: GEN 1 .
Workability: High.
• Extent: Maintain 75 mm between top of fill and external ground level and a minimum of 225
mm between top of fill and ground level dpc.
• Placement: Compact to eliminate voids.
120 CLEANLINESS
• Cavity base and faces, ties, insulation and exposed dpcs: Free from mortar and debris.
132A PERPEND JOINT PLASTICS WEEP HOLES
• Manufacturer: Rytons Building Products Ltd.
- Web: www.vents.co.uk.
- Email: lit@rytons.com.
- Product reference: Rytons Rytweep Clear Ref: RYTWECL.
• Accessories: Rytons Rytweep Tube Ref: RYTWTUBE.
132B PERPEND JOINT PLASTICS WEEP HOLES
• Manufacturer: As Clause 132A.
- Product reference: As Clause 132A.
• Locations: Through outer leaf immediately above base of cavity, at cavity trays, stepped
dpcs and above external openings. Ensure that weep hole is flush with face of masonry
and does not project.
75 mm above top of cavity fill at base of cavity.
• Provision: At not greater than 1000 mm centres and not less than two over each opening.

155 PARTIAL FILL CAVITY INSULATION
• Insulation: Phenolic foam boards to BS EN 13166: 2001.
- Product certification: British Board of Agrement (BBA) Certificate number 94/3047.
• Manufacturer: Kingspan Insulation Ltd
- Web: www.kingspaninsulation.co.uk
- Email: technical@kingspaninsulation.co.uk.
- Product reference: Kooltherm K8 Cavity Board or equal approved .
• Recycled content: Not applicable.
• Face size (length x width): 1200 x 450 mm.
• Thickness (nominal): 95mm.
• Thermal conductivity: 0.020 W/(m.K).
• Reaction to fire class: Class 1 to BS476-7: 1997.
• Additional requirements: None.
• Placement: Secure against face of inner leaf.
- Residual cavity: Clear and unobstructed.
• Joints between boards, at closures and penetrations: No gaps and free from mortar and
debris.
160A RYTONS PERISCOPE® UNDERFLOOR VENTILATOR
• Manufacturer: Rytons Building Products Ltd.
- Web: www.vents.co.uk.
- Product reference: Rytons Periscope Underfloor Ventilator Ref: PUFV
• Accessories: Rytons Vertical Extension Ref: PUFVVEXT.
160B AIR BRICKS IN CROSS WALLING
• Standard: To BS 493, class 1.
• Manufacturer: Rytons Building Products Ltd
- Web: www.vents.co.uk
- Product reference: Rytons Multifix Air Brick.
• Apertures: Rectangular hole.
• Work sizes: 215 x 65 mm.
• Material/ Colour: tbc.
• Placement: Built in with no gaps at joints.
160C AIR BRICKS IN EXTERNAL WALLING
• Standard: To BS 493, class 1.
• Manufacturer: Hanson Redbank.
- Product reference: square hole clay air bricks.
• Apertures: Rectangular hole.
• Work sizes: 215 x 65 mm.
• Material/ Colour: red / buff.
• Placement: Built in with no gaps at joints.
180A CAVITY CLOSERS AROUND OPENINGS IN EXTERNAL CAVITY WALLS
• Manufacturer: As clause 180B.
- Cavity width: 75 / 120mm.
• Thermal conductivity: 0.022 W/m.K.
• Fire performance: 60 minutes.
• Testing method: UKAS Accredited fire resistance test utilising the general principles of BS
476 Part 20: 1987 (Fire tests on building materials and structures. Method for
determination of the fire resistance of elements of construction (general principles).

180B CAVITY CLOSERS
• Manufacturer: Kingspan Insulation Ltd.
- Web: www.kingspaninsulation.co.uk.
- Email: technical@kingspaninsulation.co.uk.
- Product reference: Kingspan Kooltherm Cavity Closer 125 .
• Accessories: Jointing Clip and Fixing Tie.
REINFORCING/ FIXING ACCESSORIES
210A CAVITY WALL TIES FOR UNINSULATED CAVITY WALLS WITH BLOCKWORK INNER
LEAF
• Standard: PD 6697: 2010.
- Type: 1 (Masonry heavy duty) .
• Material/ finish: Stainless steel .
• Manufacturer: As clause 210B .
210B CAVITY WALL TIES
• Manufacturer: Ancon Building Products.
- Web: www.ancon.co.uk.
- Email: info@ancon.co.uk.
- Product reference: ST1 Wall tie
• Length: 250 mm.
• Material: Stainless steel grade 1.4301 (304).
211A CAVITY WALL TIES USED WITH PARTIAL FILL INSULATION FOR ALL CAVITY WALLS
USING PARTIAL FILL INSULATION
• Standard: PD 6697: 2010.
- Type: 1 (Masonry heavy duty) .
• Material/ finish: Stainless steel.
• Manufacturer: As clause 211B.
• Tie mounted insulation retaining clips: As recommended by the manufacturer.
211B CAVITY WALL TIES USED WITH PARTIAL FILL INSULATION
- Product reference: ST1 Wall tie
• Length: 250 mm.
220A WALL TIES
- Product reference: SDV Frame Cramp Tie.
• Length: as indicated on drawings.
• Accessories: Ancon ISO-TW Washer and Ancon Gauge Tape.
220B WALL TIES
- Product reference: PPV Frame Cramp Tie with debonding sleeve.
• Length: as indicated on drawings.
• Accessories: Ancon ISO-TW Washer and Ancon Gauge Tape.

220C WALL TIE - FLAT BAR
- Product reference: PPS Flat Bar Wall Tie with debonding sleeve.
• Length: 225 mm.
225 FIXING TIES IN MASONRY CAVITY WALLS
• Embedment in mortar beds (minimum): 50 mm.
• Placement: Sloping slightly downwards towards outer leaf, without bending. Drip centred in
the cavity and pointing downwards.
• Spacing: Staggered in alternate courses.
- Horizontal centres: 600 mm .
- Vertical centres: 450 mm .
• Additional ties: Provide within 225 mm of reveals of unbonded openings.
- Spacing: At not more than 300 mm centres vertically .
233 FIXING TIES IN MASONRY CAVITY WALLS WITH PARTIAL FILL CAVITY INSULATION
• Embedment in mortar beds (minimum): 50 mm.
• Placement: Sloping slightly downwards towards outer leaf, without bending. Drip centred in
the cavity and pointing downwards.
• Spacing: Evenly space in non staggered horizontal and vertical rows.
- Horizontal centres: 600 mm.
- Vertical centres: 450 mm.
• Spacing centres of top (eaves) row of ties: Not more than 450 mm.
• Provision of additional ties: Within 225 mm of reveals of unbonded openings.
- Spacing: At not more than 300 mm centres vertically.
241A WALL STARTERS/ CONNECTORS
- Product reference: Staifix Universal Wall Starter System.
• Material:
- Universal Wall Starter: Stainless steel grade 1.4301.
- QuickStart Wall Starter: Not applicable.
250A SLIDING ANCHOR RESTRAINT SLIP TIES
- Product reference: SAH Sliding Anchors
• Stem: SAH-UO.
- Offset: 35 mm.
- Length: 450mm.
• Wall ties: SPI.
• Length: 150 mm.
• Slot position: Not required.

251A WALL HEAD RESTRAINT SLIP TIES
- Product reference: IHR-V Head Restraint.
• Length: Standard.
251B WALL HEAD RESTRAINT SLIP TIES
- Product reference: FHR Head Restraint.
• Length: to suit 140mm blockwork.
270 MESHWORK JOINT REINFORCEMENT WHERE REQUIRED
• Standard: Not applicable.
- Email: info@ancon.co.uk..
- Product reference: Meshwork Joint Reinforcement.
• Type: Welded wire ladder type.
• Width: Approximately 40-50 mm less in width than wall or leaf.
• Placement: Lay on an even bed of mortar in a continuous strip with full laps at angles.
Keep back 20 mm from face of external work, 12 mm back from face of internal work and
finish joint to normal thickness.
- Lap length (minimum): in accordance with manufacturer's recommendations.
281A LATERAL RESTRAINT PROPRIETARY SLIP TIES FOR MOVEMENT JOINTS
- Product reference: Lateral Restraint Slip Ties
• Type: Ancon PPS wall tie with debonding sleeve.
• Length: 200mm.
FLEXIBLE DAMP PROOF COURSES/ CAVITY TRAYS
330A DAMP PROOF COURSE
• Manufacturer: Visqueen Building Products.
- Web: www.visqueenbuilding.co.uk.
- Email: riba@visqueenbuilding.co.uk.
- Product reference: Zedex CPT High Performance DPC
• Width: 100 or 140mm to suit internal/external leaf.
• Accessories: Detailing Strip and DPC Jointing Tape.
345A SITE FORMED FLEXIBLE SHEET CAVITY TRAYS
- Email: riba@visqueenbuilding.co.uk.
- Product reference: Zedex CPT High Performance DPC
• Width: refer to architect's drawings.
• Accessories: Detailing Strip and DPC Jointing Tape.

385 PREFORMED DPC/ CAVITY TRAY JUNCTION CLOAKS/ STOP ENDS
- Email: riba@visqueenbuilding.co.uk..
- Product references and locations: Zedex CPT High Performance DPC.
• Placement: Seal laps with dpcs and/ or cavity trays.
390 SITE FORMED DPC/ CAVITY TRAY JUNCTIONS/ STOP ENDS
• Three dimensional changes in shape: Form to provide a free draining and watertight
installation. Seal laps.
• Alternative use of preformed junction cloaks/ stop ends: Submit proposals.
INSTALLATION OF DPCS/ CAVITY TRAYS
415 HORIZONTAL DPCS
• Placement: In continuous lengths on full even bed of fresh mortar, with 100 mm laps at
joints and full laps at angles.
• Width: At least full width of leaf unless otherwise specified. Edges of dpc not covered with
mortar or projecting into cavity.
• Overlying construction: Immediately cover with full even bed of mortar to receive next
masonry course.
• Overall finished joint thickness: As close to normal as practicable.
425 GROUND LEVEL DPCS
• Joint with damp proof membrane: Continuous and effectively sealed.
435 STEPPED DPCS IN EXTERNAL WALLS
• External walls on sloping ground: Install dpcs not less than 150 mm above adjoining
finished ground level.
445 SILL DPCS
• Form and placement: In one piece and turned up at back when sill is in contact with inner
leaf.
455 COPING/ CAPPING DPCS
• Placement: Bed in one operation to ensure maximum bond between masonry units, mortar
and dpc.
• Dpcs crossing cavity: Provide rigid support to prevent sagging.
465 SEALING DPCS GENERALLY
• Overlaps and junctions: Seal with Adhesive recommended by dpc manufacturer .
475 SITE FORMED CAVITY TRAYS
• Requirements to prevent downward ingress of water:
- Profiles: To match those shown on drawings. Firmly secured.
- Joint treatment: Use unjointed wherever possible, otherwise lap at least 100 mm and
seal to produce a free draining and watertight installation.
- Horizontal cavity trays: Support using cavity closer.
- Sloping cavity trays: Prevent sagging.
- Cleanliness: Free from debris and mortar droppings.
485 CAVITY TRAYS OVER OPENINGS AND OTHER CAVITY BRIDGINGS
• Length: To extend not less than 150 mm beyond ends of lintels/ bridgings.

525 DPC/ CAVITY TRAY LEADING EDGE IN FACEWORK - SET BACK
• Treatment at face of masonry: Set back 5 mm from face of wall with recessed mortar joint
to expose edge at the following locations: At window and door heads .
535 DPC/ CAVITY TRAY LEADING EDGE IN FACEWORK - PROJECTING
• Treatment at face of masonry: Projecting 5 mm from face of wall at the following locations: A
t ground level .
560 VERTICAL DPCS GENERALLY
• Form: In one piece wherever possible.
- Joints: Upper part overlapping lower not less than 100 mm.
570 JAMB DPCS AT OPENINGS
• Joint with cavity tray/ lintel at head: Full underlap.
• Joint with sill/ horizontal dpc at base: Full overlap.
• Projection into cavity: Not less than 25 mm.
• Relationship with frame: In full contact.
JOINTS
610A MOVEMENT JOINTS WITH SEALANT TO EXTERNAL FACING BRICKWORK
• Joint preparation and sealant application: As section Z22.
• Filler: Closed cell polyethylene foam .
- Thickness: To match design width of joint.
- Manufacturer: As Clause 610 B.
- Placement: Build in as work proceeds with no projections into cavities and to correct
depth to receive sealant system.
• Sealant: As clause 610C.
610B JOINT FILLER
• Manufacturer: Fosroc Ltd.
- Web: www.fosroc.com.
- Email: enquiryuk@fosroc.com.
- Product reference: Expandafoam
610C SEALANT
• Manufacturer: contractor choice
sealent to external walls to be anti-pick. Contractor to submit amples for testing prior to
installation.
Colour: to approval.
• Accessories: Expandafoam polyethylene cord backing.
630 UNEXPOSED CONTRACTION JOINTS
• Formation: Close butt as work proceeds.
650 POINTING IN FLASHINGS
• Joint preparation: Free of debris and lightly wetted.
• Pointing mortar: As for adjacent walling.
• Placement: Fill joint and finish flush.

PROPRIETARY SILLS/ LINTELS/ COPINGS/ DRESSINGS
745 PRESTRESSED CONCRETE LINTELS
• Standard: To BS EN 845-2.
• Manufacturer: Naylor Concrete Products Ltd.
- Tel: +44 (0)1924 267286
- Fax: +44 (0)1924 265674
- Email: concrete@naylor.co.uk
- Web: www.naylor.co.uk.
- Product reference: Hi-Spec Range.
• Types: Single.
• Sizes: As schedule.
• Additional requirements: none.
• Placement: Bed on mortar used for adjacent work. Prop at not more than 1.2 m centres to
prevent displacement during construction. Retain props in position for not less than 14
days or until mortar has matured, whichever is longer.
- Bearing length (minimum): 150 mm.
755A PREFABRICATED STEEL LINTELS USED IN CONJUNCTION WITH BLOCKWORK
INNER LEAF
• Manufacturer: Birtley Building Products Ltd or equal approved.
- Product reference: CB 110/130 or HS 110/130 depending on span. Refer to schedule .
• Types: Combined.
• Material/ finish: Zinc coated steel to BS EN ISO 1461 with minimum coating mass of 460
g/m?, coating minimum thickness of 65 micrometres.
• Additional requirements: Fully insulated using CFC, HCFC and HFA freeexpanded
polystyrene insulation .
• Placement: Bed on mortar used for adjacent work.
755B PREFABRICATED STEEL LINTELS USED IN CONJUNCTION WITH CONCRETE
LINTEL TO FORM SCOTTISH REVEAL
• Manufacturer: Birtley Building Products Ltd or equal approved.
- Product reference: LA or EV 100 depending on span. Refer to schedule.
• Types: Combined.
• Material/ finish: Zinc coated steel to BS EN ISO 1461 with minimum coating mass of 460
g/m?, coating minimum thickness of 65 micrometres.
• Additional requirements: Fully insulated using CFC, HCFC and HFA freeexpanded
polystyrene insulation .
• Placement: Bed on mortar used for adjacent work.
MISCELLANEOUS ITEMS
840 OPENINGS FOR FRAMES
• Formation: Use accurate, rigid templates to required size.
850 WALL PLATES
• Placement: On full bed of mortar to correct horizontal level.

F31
Precast concrete sills/ lintels/ copings/ features

F31 Precast concrete sills/ lintels/ copings/ features
TYPES OF COMPONENT
112A DESIGNATED CONCRETE PRECAST PRESTRESSED LINTELS
• Manufacturer: As clause 112A.
• Other requirements: None .
112B PRESTRESSED CONCRETE LINTELS
Manufacturer: Naylor Concrete Products Ltd.or equal approved to be confirmed by
structiural engineer
- Tel: +44 (0)1924 267286
- Fax: +44 (0)1924 265674
- Email: concrete@naylor.co.uk
- Web: www.naylor.co.uk.
- Product reference: Hi-Spec Range.
• Additional requirements: none.
• Placement: Bed on mortar used for adjacent work. Prop at not more than 1.2 m centres to
prevent displacement during construction. Retain props in position for not less than 14
days or until mortar has matured, whichever is longer.
125 SUBSTITUTION OF PROPRIETARY CONCRETE FOR DESIGNATED CONCRETE
• Concrete: Component manufacturer's 'proprietary' concrete.
• Substitution: Submit proposals for each substitution, including:
- Identity of concrete: Manufacturer's mix reference .
- Performance: Limiting values for w/c ratio, cement/ combination content or, alternatively
the Exposure class to BS 8500, to which concrete conforms.
- Reinforcement: Type and cover.
- Evidence of performance: Third party certification by body
from a UKAS accredited laboratory.
130 CONCEALED PRECAST LINTELS
- Verification of performance: Submit calculations or test certificates.

140 CONCEALED PRECAST LINTELS
• Concrete: Designated to BS 8500-2: Minimum RC30.
- Aggregate size (maximum): 20 mm.
• Configuration:
- Clear span up to 900 mm:
Section: 140 mm deep x width of wall.
Bearing: 150 mm at both ends.
Reinforcement: One 12 mm carbon steel bar for each 105 mm of wall thickness.
- Clear span 900 mm to 1800 mm:
Section: 215 mm deep x width of wall.
Bearing: 225 mm at both ends.
Reinforcement: One 16 mm carbon steel bar for each 105 mm of wall thickness.
• Cover to reinforcement (nominal): 20 mm minimum.
150 CONCEALED PRECAST PADSTONES .
• Concrete: Designated to BS 8500-2: Minimum RC30.
- Aggregate size (maximum): 20 mm.
• Other requirements: none .
GENERAL REQUIREMENTS
210 MOULDS
• Permissible fabrication and operating tolerances: Length 0 to +6 mm, other dimensions ?3
mm.
220 CONCRETE GENERALLY
• Specification: To BS 8500-2 and BS EN 206-1.
• Producer: Currently certified by a body accredited by UKAS to BS EN 45011 for product
conformity certification of ready-mixed concrete.
• Chloride class of concrete:
- Excluding SRPC: C1 0.40.
- Using SRPC: C1 0.20.
- Reinforced and heat cured: C1 0.10.
- Prestressed: C1 0.10.
• Admixtures containing calcium chloride: Not allowed.
250 REINFORCEMENT
• Carbon steel reinforcement: As appropriate to BS 4449, BS 4482 and BS 4483.
- Cutting and bending: To BS 8666.
• Galvanized reinforcement: Galvanized to BS EN ISO 1461 after cutting. Chromate treated.
• Stainless steel reinforcement: To BS 6744.
- Designation 1.4301.
- Cutting and bending: To BS 8666.
• Non structural reinforcement: Include to resist shrinkage and handling stresses.
• Bimetallic corrosion and staining: Prevent by appropriate selection and use of materials.
• Condition at time of placement: Clean, free of corrosive pitting, loose materials and
substances that adversely affect reinforcement, concrete, or bond between the two.
• Fixing: Accurate and secure.
- Method: Wire tying, approved steel clips or tack welding if permitted.
- Concrete cover: Maintain free of all tying wire or clips.
255 QUALITY ASSURANCE OF REINFORCEMENT
Reinforcement to BS 4449, BS 4483, BS 6744: Obtain valid
certificates of approval for product conformity issued by the
UK Certification Authority for Reinforcing Steels.

260 CASTING AND CURING
• Placing of concrete: Thoroughly compact.
• Protection against drying out: Methods and duration to
BS EN 13369 clause 4.2.1.3.
• Immature components: Avoid movement, vibration, overloading, physical shock, rapid
cooling and thermal shock.
• Delivery to site: Minimum 14 days after casting.
261 CUTTING
• Cutting of precast concrete components: Not permitted.
262 RECORDS
• Records for each type of component: Maintain details including:
- Unique identification number.
- Identification of the producer.
- Identification of the place of production.
- Correlation with records of mixes, including batch numbers.
- Date of each stage of manufacture.
- Dates and results of all tests, checks and inspections.
- Dimensions related to specified levels of accuracy.
- Specific location in the finished work.
- Weight of the unit.
- Damage and making good.
- Any other pertinent data, e.g. if unit is a production control unit.
• Availability of records for inspection: On request.
INSTALLATION
420 LAYING
• Mortar for bedding and jointing: As section Z21.
- Type: Site batched and mixed.
- Mix: 1:1:6 cement: lime:sand.
- Packing: If required use slate.
• Bedding components: On full bed of mortar.
• Removal of marks, stains and extraneous mortar on visible faces: Rubbing not permitted.
440 ONE PIECE SILLS/ THRESHOLDS
• Bed joints: Leave clear of mortar except at end bearings and beneath masonry mullions.
- On completion: Point with mortar to match adjacent work.

G20
Carpentry/ timber framing/ first fixing

G20 Carpentry/ timber framing/ first fixing
GENERAL
105 TIMBER PROCUREMENT
• Timber (including timber for wood based products): Obtained from well managed forests/
plantations in accordance with:
- The laws governing forest management in the producer country or countries.
- International agreements such as the Convention on International Trade in Endangered
Species of wild fauna and flora (CITES).
• Documentation: Provide either:
- Documentary evidence (which has been or can be independently verified) regarding the
provenance of all timber supplied, or
- Evidence that suppliers have adopted and are implementing a formal environmental
purchasing policy for timber and wood based products.
115 CONTRACTOR'S STRUCTURAL DESIGN
• Design responsibility: Design and detail trussed rafters to main roof.
• Requirement:
- Generally: As section B50/B51.
Modifications: see structural engineers specification.
- Design: Complete the design in accordance with the designated code of practice to
satisfy specified performance criteria.
- Service class: 1.
- Additional requirements: None.
• Design and production information:
- Drawings: Showing service void and route required, roof covering - see sections and roof
layouts.
- Other requirements: in accordance with structural engineers design load criteria .
• Timing of submissions: submit full drawings for comment prior to manufacture.
150 STRENGTH GRADING OF TIMBER
• Grader: A company currently registered under a third party quality assurance scheme
operated by a certification body approved by the UK Timber Grading Committee.
160 GRADING AND MARKING OF SOFTWOOD
• Timber of a target/ finished thickness less than 100 mm and not specified for wet exposure:
Graded at an average moisture content not exceeding 20% with no reading being in
excess of 24% and clearly marked as 'DRY' or 'KD' (kiln dried).
• Timber graded undried (green) and specified for installation at higher moisture contents:
Clearly marked as 'WET' or 'GRN'.
• Structural timber members cut from large graded sections: Regraded to approval and
marked accordingly.
Page 34 of 266 G20 Project Fitzroy

PRODUCTS
210 STRUCTURAL SOFTWOOD (GRADED DIRECT TO STRENGTH CLASS) FOR
STRUCTURAL USE GENERALLY
• Grading standard: To BS 4978, BS EN 14081-1, or other national equivalent and so
marked.
• Strength class to BS EN 338: SEE STRUCTURAL ENGINEERS SPECIFICATION.
• Treatment:
- Preservative treatment: Organic solvent impregnation to NBS section Z12 and Wood
Protection Association Commodity Specification C8.
Design service life: 40 years.
- Fire retardant treatment: Fire retardant impregnation to NBS section Z12 and Wood
Protection Association Commodity Specification FR5, Type D for external cladding to
cafeI.
270 UNGRADED SOFTWOOD FOR INTERNAL NON-STRUCTURAL USE
• Quality of timber: Free from decay, insect attack (except pinhole borers) and with no knots
wider than half the width of the section.
• Surface finish: Regularized.
• Treatment:
Protection Association Commodity Specification C8 where specified .
- Design service life: 40 years.
- Fire retardant treatment: None required.
275 WOOD TRIM FOR EAVES FASCIA
• Species: Contractor's choice.
• Standard: To BS 1186-3.
- Class: 2.
• Treatment: Organic solvent impregnation to NBS section Z12 and Wood protection
Association Commodity Specification C5.
- Design service life: 40 years.
• Fixing: as details.
• Other requirements: Undercut bottom edge of boards to form drip.
311 NON-STRUCTURAL PLYWOOD cladding to cafe
• Standard: To an approved national standard.
• Thickness: 18mm.
• Appearance class to BS EN 635: I.
• Bond quality to BS EN 314-2: Class 3.
• Finish: Sanded.
• Treatment:
Protection Association Commodity Specification C8.
Design service life: 40 years.
- Fire retardant treatment: Fire retardant impregnation to NBS section Z12 and Wood
Protection Association Commodity Specification FR5 for external use.
350 TRUSSED RAFTERS
• Design and fabrication: To BS 5268-3 and BS EN 14250.
• Manufacturer: A firm currently registered under a third party quality assurance scheme.
• Truss system: Agrement certified.
• Ancillary components to be supplied by the truss fabricator: all items to complete roof
system.
• Treatment: Organic solvent type as section Z12 and BWPDA Commodity Specification C8 .

WORKMANSHIP GENERALLY
401 CROSS SECTION DIMENSIONS OF STRUCTURAL SOFTWOOD AND HARDWOOD
• Dimensions: Dimensions in this specification and shown on drawings are target sizes as
defined in BS EN 336.
• Tolerances: The tolerance indicators (T1) and (T2) specify the maximum permitted
deviations from target sizes as stated in BS EN 336, clause 4.3:
- Tolerance class 1 (T1) for sawn surfaces.
- Tolerance class 2 (T2) for further processed surfaces.
420 WARPING OF TIMBER
• Bow, spring, twist and cup: Not greater than the limits set down in BS 4978 or BS EN
14081-1 for softwood, or BS 5756 for hardwood.
430 SELECTION AND USE OF TIMBER
• Timber members damaged, crushed or split beyond the limits permitted by their grading:
Do not use.
435 NOTCHES, HOLES AND JOINTS IN TIMBER
• Notches and holes: Position in relation to knots or other defects such that the strength of
members will not be reduced.
• Scarf joints, finger joints and splice plates: Do not use without approval.
440 PROCESSING TREATED TIMBER
• Cutting and machining: Carry out as much as possible before treatment.
• Extensively processed timber: Retreat timber sawn lengthways, thicknessed, planed,
ploughed, etc.
• Surfaces exposed by minor cutting/ drilling: Treat with two flood coats of a solution
recommended by main treatment solution manufacturer.
450 MOISTURE CONTENT
• Moisture content of wood and wood based products at time of installation: Not more than:
- Covered in generally unheated spaces: 24%.
- Covered in generally heated spaces: 20%.
- Internal in continuously heated spaces: 20%.
451 MOISTURE CONTENT TESTING
• Procedure: When instructed, test timber sections with an approved electrical moisture
meter.
• Test sample: Test 5% but not less than 10 lengths of each cross-section in the centre of
the length.
• Test results: 90% of values obtained to be within the specified range. Provide records of all
tests.
460 PROTOTYPES
• Components: Prepare one of each of the following and arrange for inspection before
starting repetitive fabrication:
cafe cladding panels.

510 PROTECTION
• Generally: Keep timber dry and do not overstress, distort or disfigure sections or
components during transit, storage, lifting, erection or fixing.
• Timber and components: Store under cover, clear of the ground and with good ventilation.
Support on regularly spaced, level bearers on a dry, firm base. Open pile to ensure free
movement of air through the stack.
• Trussed rafters: Keep vertical during handling and storage.
520 EXPOSED END GRAIN
• Components: Seal exposed end grain of the following before delivery to site:
all exposed.
• Sealer: Clear end grain sealer.
550 EXPOSED TIMBER
• Planed structural timber exposed to view in completed work: Prevent damage to and
marking of surfaces and arrises.
JOINTING TIMBER
570 JOINTING/FIXING GENERALLY
• Generally: Where not specified precisely, select methods of jointing and fixing and types,
sizes and spacings of fasteners in compliance with section Z20.
580A FRAMING ANCHORS
• Manufacturer: contractor choice.
• Material/ finish: Galvanized low carbon steel or as recommended by truss manufacturer .
• Fasteners: Galvanized or sherardized square twist nails.
- Size: Not less than size recommended by anchor manufacturer.
• Fixing: Secure using not less than the number of nails recommended by anchor
manufacturer.
630 BOLTED JOINTS
• Bolt spacings (minimum): To BS 5268-2, table 81.
• Holes for bolts: Located accurately and drilled to diameters as close as practical to the
nominal bolt diameter and not more than 2 mm larger.
• Washers: Placed under bolt heads and nuts that would otherwise bear directly on timber.
Use spring washers in locations which will be hidden or inaccessible in the completed
building.
• Bolt tightening: So that washers just bite the surface of the timber. Ensure that at least one
complete thread protrudes from the nut.
- Checking: At agreed regular intervals up to Completion. Tighten as necessary.
650A GLUED JOINTS
Compatibility: Where relevant, obtain manufacturer's confirmation that adhesive is
compatible with preservative/ fire retardant treatment.
• Glued structural components: Fabricated to BS 6446 in clean, controlled workshop
conditions.
670 ANTI-CORROSION FINISHES FOR FASTENERS
• Galvanizing: To BS 7371-6, with internal threads tapped and lightly oiled following
treatment.
• Sherardizing: To BS 7371-8, Class 1.
• Zinc plating: To BS EN ISO 4042 and passivated.

ERECTION AND INSTALLATION
710 PROPOSALS FOR ERECTING STRUCTURAL TIMBER
• Proposals: Submit details of:
- Method and sequence of erection.
- Type of craneage.
- Temporary guys and bracing proposed for use during erection.
• Latest date for submission: 10 days before erection commences.
740 PRE-ERECTION CHECKING
• Timing: Not less than 10 days before proposed erection start date.
• Checklist:
- Foundations and other structures to which timber structure will be attached: Check for
accuracy of setting out.
- Holding down bolts: Check for position, protruding length, condition and slackness.
• Inaccuracies and defects: Report without delay.
• Erection: Obtain permission to commence.
750 MODIFICATIONS/REPAIRS
• Defects due to detailing or fabrication errors: Report without delay.
• Methods of rectification: Obtain approval of proposals before starting modification or
remedial work.
• Defective/damaged components: Timber members/ components may be rejected if the
nature and/or number of defects would result in an excessive amount of site repair.
760 TEMPORARY BRACING
• Provision: As necessary to maintain structural timber components in position and to ensure
complete stability during construction.
770 ADDITIONAL SUPPORTS
• Provision: Position and fix additional studs, noggings and/ or battens to support edges of
sheets materials, and wall/ floor/ ceiling mounted appliances, fixtures, etc. shown on
drawings
• Material properties: Additional studs, noggings and battens to be of adequate size and
have the same treatment, if any, as adjacent timber supports.
775 BEARINGS
• Timber surfaces which are to transmit loads: Finished to ensure close contact over the
whole of the designed bearing area.
• Packings: Where provided, to cover the whole of the designed bearing area.
- Crushing strength: Not less than timber being supported.
- In external or inaccessible locations: Rot and corrosion proof.
780 WALL PLATES
• Position and alignment: To give the correct span and level for trusses, joists, etc.
• Bedding: Fully in fresh mortar.
• Joints: At corners and elsewhere where joints are unavoidable use nailed half lap joints. Do
not use short lengths of timber.
784 JOISTS GENERALLY
• Centres: Equal, and not exceeding designed spacing.
• Bowed joists: Installed with positive camber.
• End joists: Positioned approximately 50 mm from masonry walls.

786 JOISTS ON HANGERS
• Hangers: Bedded directly on and hard against supporting construction. Do not use packs
or bed on mortar.
• Joists: Cut to leave not more than 6 mm gap between ends of joists and back of hanger.
Rebated to lie flush with underside of hangers.
• Fixing to hangers: A nail in every hole.
790 STANDARD JOIST HANGERS -.
• Size and type: To suit joist, design load and crushing strength of supporting construction.
• Material/ finish: Galvanized low carbon steel.
795 TRIMMING OPENINGS
• Trimmers and trimming joists: When not specified otherwise, not less than 25 mm wider
than general joists.
800A TRUSSED RAFTER INSTALLATION
• Erection: To BS 5268-3, clause 9.3 and TRA site installation guide.
• Trusses generally: Do not modify without approval.
• Damaged trusses: Do not use.
• For fixing details to concrete slab and steel structure see structural engineers details
810A PERMANENT BRACING OF TRUSSED RAFTERS
• Bracing and binders: to specialists deisgn
- Method of fixing: To every rafter, strut or tie with not less than two fasteners.
Fasteners: 75 x 3.35 mm galvanized round wire nails.
• Lap joints: Extended over and nailed to at least two truss members.
820A VERTICAL RESTRAINT STRAPS to roofs
• - To timber members with not less than 30 x 3.5 mm galvanized square twist.
- To masonry with not less than five 50 mm x 12 gauge sherardized screws evenly
spaced, with at least one screw located within 150 mm of the bottom end of each strap.
All in accordance with structural engineers design
830A LATERAL RESTRAINT STRAPS to roofs
Material/ finish: Galvanized steel.
• Size: to structural engineers design.
• Fixing: To top of joists/ rafters/ ties at not more than 1.2 m centres and as shown on
drawings.
- Ensure that cranked end is in tight contact with cavity face of wall inner leaf and is not
pointing upwards.
• Straps spanning joists/ rafter/ ties running parallel to wall: Fix noggings and packs tightly
beneath straps.
- Size of noggings and packs: Not less than three quarters of joist/ rafter/ tie depth and not
less than 38 mm thick.
- Notching: Notch joists so that straps fit flush with surface. Do not notch rafters/ ties.
• Fasteners: to engineers design.
850 INSPECTION GENERALLY
• Structural timber-work: Give reasonable notice before covering up.
860 BOLTED JOINTS INSPECTION
• Timing: Inspect all accessible bolts at the end of the Defects Liability Period and tighten if
necessary.

870A ANCHOR TESTING
• Standard: To BS 5080-1 and -2.
as required in structural engineers specification
• Test reports: Submit as soon as available.

H11 Curtain walling
TENDERING
10A INFORMATION TO BE PROVIDED WITH TENDER
• Submit the following curtain walling particulars:
- Typical plan, section and elevation drawings at suitable scales.
- Typical detailed drawings at large scales, including typical head and sill sections .
- Technical information and certification demonstrating compliance with specification of
proposed incorporated products and finishes, including insulating glass units, automatic
opening vents .
- Certification, reports and calculations demonstrating compliance with specification of
proposed curtain walling.
- Proposals for connections to and support from the building structure and building
components.
- Proposals for amendments to primary supporting structure and for secondary supporting
structure additional to that shown on preliminary design drawings.
- Schedule of builder's work, special provisions and special attendance by others.
- Examples of standard documentation from which project quality plan will be prepared.
- Preliminary fabrication and installation method statements and programme.
- Schedule of products and finishes with a design life expectancy less than that specified
in clause 440, with proposals for frequencies and methods of replacement.
- Proposals for replacing damaged or failed products.
- Areas of non-compliance with the specification.
- PROPOSALS FOR COMPONENT TESTING IN ACCORDANCE WITH CLAUSE 550B
TYPES OF CURTAIN WALLING
110A CURTAIN WALLING TO CORRIDORS
• Supporting structure: Steel frame .
• Curtain walling system:
- Manufacturer: As clause 110B .
• Glazing system: Gaskets, cover plate fixed .
• Panel/ facing type: secure glazing and pasivent panels .
Accessories: None .
• Incorporated components:
Double access doors
- Glazed-in ventilation louvres as clause 140A .
• Other requirements: To include all products, fixings and interfaces necessary to complete
the fabrication and installation. Performance criteria to comply with Design/Performance
Requirements and Testing subsections INC 550b .
Page 42 of 266 H11 Project Fitzroy

110B CURTAIN WALLING SYSTEM
• Manufacturer: contractor choice
- Product reference: MX62 SYSTEM OR EQUAL APPROVED.
• Internal framing member:
- Material: Aluminium Alloy 6063T6 to BS1474. Steel core to mullions dependant on
testing criteria - see below.
- Finish: Stoved polyester powder coated, Colour Ref: To be confirmed.
Minimum film thickness: 60 micrometres.
• External cover cap:
- Material: Aluminium Alloy 6063T6 to BS1474.
- Finish: Stoved polyester powder coated, Colour Ref: To be confirmed.
Minimum film thickness: 60 micrometres.
• Glazing: Double glazed sealed units comprising: Proprietory secure galazing system to
both sides - 14.5mm ESG secure P7BT glass, supplied by ESG secure or equal approved
specialist.
ESG Ltd
1-3 Moss Road
Witham, Essex
CM8 3UQ
Tel: 01376 520061
Email: sales@esguk.co.uk
www.esguk.co.uk .
• Glazing system: Gaskets, cover plate fixed. Note due to secure environment, cappings to
be screw fixed at 150mm centres and internal gaskets cut to short lengths.
Other requirements: To be installed using screws and fixings manufactured from stainless
steel or other corrosion resistant materials;
Fixings to be resin anchored into masonry or bolted to steelwork at 150mm centres.
The curtain walling configuration will be capable of withstanding attack as detailed in DoH
Environmental design guide for adult secure servcies test levels 1,2 & 3, SE CLAUSE
550B .
135 DOORS
• Manufacturer: contractor choice .
- Product reference: CD commercial door .
• Material: Aluminium Alloy 6063T6 to BS1474 .
• Finish: Polyester powder coating .
- Colour/ texture: to be confirmed .
- Minimum film thickness: 60 micrometres .
• Fixing: Contractor to submit proposals .
• Other requirements: Performance criteria as clause 436. Ironmongery anti-ligature, .
137 OPENING LIGHTS (WINDOWS)
- Product reference: FXi 65 Aluminium casement windows.
• Material: Aluminium Alloy 6063T6 to BS1474.
• Finish: Polyester powder coating.
- Colour/ texture: to be confirmed.
- Minimum film thickness: 60 micometers.
• Size: Refer to schedule.
• Other requirements: Performance criteria as clause 435.

140A PASSIVENT LOUVRES
• Manufacturer: Passivent system to specialist design. Units to comprise louvre externally ,
internal thermally broken baffle system and bespoke flat perforated plate internally, plate to
anti-ligature design to client approval. .
• Material: aluminium .
• Finish: Powder coating .
- Colour/ texture: tbc .
Fixing: glazed into curtan walling .
• Other requirements: see architects design intent documentand ventilation strategy
provided by M&E designer. Passivent to be provided with interface unit for automated
action. .
150 MATERIALS SPECIFICATION
• Minimum 'BRE Green Guide to Specification Online' rating: B.
GENERAL REQUIREMENTS/ PREPARATORY WORK
210 DESIGN
• Curtain walling and associated features: Complete the detailed design. Submit before
commencement of fabrication.
• Related works: Coordinate in the detailed design.
220 SPECIFICATION
• Compliance standard: The Centre for Window and Cladding Technology (CWCT)
'Standard for systemised building envelopes'.
• Reference information: For the duration of the contract, keep available at the design office,
workshop and on site copies of:
- The CWCT 'Standard for systemised building envelopes'.
- Publications invoked by the CWCT 'Standard for systemised building envelopes'.
230 INFORMATION TO BE PROVIDED DURING DETAILED DESIGN STAGE
- A schedule of detailed drawings and dates for submission for comment.
- A schedule of loads that will be transmitted from the curtain walling to the structure.
- Proposed fixing anchor details relevant to structural design and construction.
- A detailed testing programme in compliance with the Main Contract master programme.
- A detailed fabrication and installation programme in compliance with the Main Contract
master programme.
- Proposals to support outstanding applications for Building Regulation consents or
relaxations.

232 QUALITY PLAN
• Requirement: Submit during detailed design.
• Content: In accordance with BS 5750, BS EN ISO 9001 and including the following:
- Name of the quality manager.
- Quality assessment procedures.
- Inspection procedures to be adopted in checking the work.
- Stages at which check lists will be used and samples of the lists.
- List of work procedures on the correct use of materials or components, both off site and
on site.
- List of product information with latest revisions.
- Subcontractors involved in the work.
- Subcontractors' quality plans.
- Storage, handling, transport and protection procedures.
- Procedure for registering and reporting non compliances.
- Maintenance procedures and calibration records.
- Certification that completed work complies with specification.
- Check list register to ensure all items have been inspected and non compliances
discharged.
232A QUALITY PLAN
• Requirement: Submit during detailed design.
• Content: In accordance with BS 5750, BS EN ISO 9001 and including the following:
- Name of the quality manager.
- Quality assessment procedures.
- Inspection procedures to be adopted in checking the work.
- Stages at which check lists will be used and samples of the lists.
- List of work procedures on the correct use of materials or components, both off site and
on site.
- List of product information with latest revisions.
- Subcontractors involved in the work.
- Subcontractors' quality plans.
- Storage, handling, transport and protection procedures.
- Procedure for registering and reporting non compliances.
- Maintenance procedures and calibration records.
- Certification that completed work complies with specification.
- Check list register to ensure all items have been inspected and non compliances
discharged.
- details of testing proposals
235 INFORMATION TO BE PROVIDED BEFORE COMMENCEMENT TESTING OR
FABRICATION OF CURTAIN WALLING
- Detailed drawings to fully describe fabrication and installation.
- Detailed calculations to prove compliance with design/ performance requirements.
- Project specific fabrication, handling and installation method statements.
- Certification for incorporated components manufactured by others confirming their
suitability for proposed locations in the curtain walling.
- Recommendations for spare parts for future repairs or replacements.
• Recommendations for safe dismantling and recycling or disposal of products.

235A INFORMATION TO BE PROVIDED BEFORE COMMENCEMENT TESTING OR
FABRICATION OF CURTAIN WALLING
- Detailed drawings to fully describe fabrication and installation.
- Detailed calculations to prove compliance with design/ performance requirements.
- Project specific fabrication, handling and installation method statements.
- Certification for incorporated components manufactured by others confirming their
suitability for proposed locations in the curtain walling.
- Recommendations for spare parts for future repairs or replacements.
• Recommendations for safe dismantling and recycling or disposal of products.
250 PRODUCT SAMPLES
• General: Before commencing detailed design, submit labelled samples of: Mullion/transom
cruciform connection of correct RAL colour and finish .
260 SAMPLES OF FIXINGS
• General: During detailed design, submit labelled samples of each type of fixing anchor,
including casting-in restraints and shims, together with manufacturers' recommended
torque figures.
DESIGN/ PERFORMANCE REQUIREMENTS
305 CWCT 'STANDARD FOR SYSTEMISED BUILDING ENVELOPES'
• General: Unless specified or agreed otherwise comply with:
Part 2 - Loads, fixings and movement.
Part 3 - Air, water and wind resistance.
Part 4 - Operable components, additional elements and means of access.
Part 5 - Thermal, moisture and acoustic performance.
Part 6 - Fire performance
Part 7 - Robustness, durability, tolerances and workmanship.
• Project performance requirements specified in this subsection: Read in conjunction with
CWCT performance criteria.
313 INTEGRITY
• Requirement: The curtain walling must resist wind loads, dead loads and design live loads,
and accommodate deflections and movements without damage.
• Design wind pressure: Calculate in accordance with BS 6399-2.
• Hard body impact loads: To BS 8200:
- Location and category: Areas within 1.5m of ground level; category B. Areas abobe 1.5m
of ground level; category E.
• Soft body impact loads - curtain walling to BS EN 14019:
- Location and classification: Areas within 1.5m of floor level; Class E5.
• Soft body impact loads - glass to BS EN 12600:
- Location and classification: Areas within 1.5m of floor level; Class 1 (B) 1.
• Permanent imposed loads: -.
• Temporary imposed loads: None.
320 DEFLECTION UNDER DEAD LOADS
• Requirement: Framing members parallel to the curtain walling plane must not:
- Reduce glass bite to less than 75% of design dimension.
- Reduce edge clearance to less than 3 mm between members and immediately adjacent
glazing units, panel/ facing units or other fixed units.
- Reduce clearance to less than 2 mm between members and movable components such
as doors and windows.

325 DEFLECTION UNDER WIND LOAD
• Requirement: To CWCT 'Standard for systemised building envelopes' clause 3.5 2 and the
following additional requirements: None.
• Additional stiffness to CWCT 'Standard for systemised building envelopes' clause 3.5 4.2:
Not allowed.
330 GENERAL MOVEMENT
• Requirement: Curtain walling must accommodate anticipated building movements as
follows: to be advised by the structural engineer .
332 APPEARANCE AND FIT
• Requirement: Design curtain walling system:
- To ensure position and alignment of all parts and features as shown on preliminary
design drawings.
- To accommodate deviations in the primary support structure.
• Primary support structure: Before commencing installation of curtain walling system, carry
out survey sufficient to verify that required accuracy of erection can be achieved.
- Give notice: If the structure will not allow the required accuracy or security of erection.
- Design tolerances: As sections G10 and F10..
• Curtain wall envelope zone tolerances:
- Width: 5mm.
Critical reference location: steekwork.
• Maximum permitted component and installation tolerances: in accordance with CWCT
Standard, clause 7.4.2.
340 AIR PERMEABILITY
• Requirement: Permissible air leakage rates of 1.5m?/hr/m? for fixed lights and 2.0
m?/hr/lin.m for opening lights must not be exceeded when the curtain walling is subjected
to the peak test pressure.
• Permeability class to BS EN 12152: A4.
- Peak test pressure: 600 Pa.
345 AIR PERMEABILITY EXFILTRATION
• Requirement: The maximum permissible air exfiltration rate through the curtain walling
system must not exceed: All external walls: 5 m?/(h.m?) at a test pressure of 50 Pa..
350 WATER PENETRATION
• Watertightness class to BS EN 12154: R7.
- Peak test pressure: 600 Pa.
• Additional requirements: Internal surfaces or cavities must not be wetted when the curtain
walling is subjected to a peak positive test pressure.
370 THERMAL PROPERTIES
• Method of calculating the thermal transmittance (U-value) of curtain walling/ each zone of
curtain walling: Weighted U-value.
• Average U-value of curtain walling: 1.8 W/m?K.
• Curtain wall zone interfaces: Co-ordinate to achieve required average U-value.
• Method for assessing thermal transmittance (U-value) of assemblies: By calculation.

380 SOLAR AND LIGHT CONTROL
• Total solar energy transmission:
- Maximum g-value - glazing only: 0.3.
- Maximum effective g-value - glazing with shading devices: Not applicable.
• Visible light transmission:
- Minimum light transmission - glazing only: 60%.
- Minimum effective light transmission - glazing with shading devices: Not applicable.
385 THERMAL STRESS IN GLAZING
• Glass panes/ units: Must have adequate resistance to thermal stress generated by
orientation, shading, solar control and construction.
390 AVOIDANCE OF CONDENSATION
• Requirement: Notional psychrometric conditions under which condensation must not form
on building interior surfaces of framing members or any part of infill panels/ facings are:
- Notional outdoor psychrometric conditions as BS 6229, table A1.
- Notional indoor psychrometric conditions:
Temperature: 20?C.
Relative humidity: 50%.
Vapour pressure: 1.17 kPa.
410 SOUND TRANSMITTANCE
• Minimum weighted sound reduction index (Rw) to BS EN ISO 717-1:
- Between internal and external surfaces of curtain walling: Refer to acoustician's report
and recommendations.
• Minimum weighted standardized level difference (DnTw) to BS EN ISO 717-1:
- Between adjacent floors abutting curtain walling: In accordance with HTM 08-01.
- Between adjacent rooms on same floor abutting curtain walling: In accordance with
HTM 08-01.
425 INTERNAL SURFACE SPREAD OF FLAME OF CURTAIN WALLING
• Standard: To BS 476-7.
- Class 0.
430 FIRE STOPPING
• Locations: At junctions of curtain walling with compartment walls and floors.
• Materials and methods of fixing: To ensure fire resistance not less than that specified for
compartment walls and floors.
435 OPENING LIGHTS (WINDOWS)
• Performance criteria: To CWCT 'Standard for systemised building envelopes' Part 3.
• Security:
- Applicable opening lights: All.
- Security rating: To BS 7950.
• Opening lights restrictive catches to CWCT 'Standard for systemised building envelopes'
clause 4.2.5: To all opening lights in windows to floors above ground level .
• Ventilation requirement: In accordance with mechanical engineer's calculations to achieve
minimum natural ventilation requirements.
• Windows to be cleaned from inside of the building: Refer to cleaning and maintenance
schedule.
• Fasteners: Concealed multipoint, operated by an internal handle.
• Integral locks: Suited to pass same key.

436 DOORS AND OTHER ACCESS FACILITIES
• Performance criteria: To CWCT 'Standard for systemised building envelopes' Part 3.
• Access facilities designated for use by disabled persons: All external doors to meet the
minimum requirements of ADM and BS8300.
• Strength and durability: To CWCT 'Standard for systemised building envelopes' clause
4.3.3.
- Forces and tests: To BS EN 12400.
• Security:
- Applicable doors: All.
- Security rating: To PAS 24-1.
440 DURABILITY
• Relevant agents or degradation mechanisms: To be determined by curtain walling
contractor.
• Design life of the curtain walling system: Not less than 50 years.
• Secondary components: Submit details together with required maintenance regime,
replacement periods and methods of replacement.
450 SAFETY
• Finished surfaces of curtain walling: Accessible internal and external areas must not:
- Have irregularities capable of inflicting personal injury.
- Release irritant or staining substances.
TESTING
510 COMPARISON (TYPE) TESTING
• Requirement: To CWCT 'Standard for systemised building envelopes', Part 8.
• Test results and reports: Before commencement of curtain walling fabrication and
installation, submit proof of compliance with this specification.
520 PROJECT TESTING (SITE)
• Test results and reports: Before installation of general areas of curtain walling, submit proof
of compliance with this specification.
530 TESTING AUTHORITY
• Requirement: Project testing must be carried out by a United Kingdom Accreditation
Service (UKAS) approved independent laboratory.

550 TEST SEQUENCE - STANDARD LABORATORY TESTS
• Requirement: To CWCT 'Standard for systemised building envelopes', Standard sequence
A, clause 8.12.1, and as follows:
• Air permeability (infiltration): To CWCT clause 8.6.
- Peak test pressure: As clause 340.
- Method of identifying areas of concentrated air leakage: Smoke.
• Air permeability (exfiltration): To CWCT clause 8.6.
- Allowable exfiltration rates: As clause 345.
• Water penetration resistance - static: To CWCT clause 8.7.1.
• Wind resistance - serviceability: To CWCT clause 8.8.
- Peak test pressure: Equal to design wind pressure specified in clause 313.
- Position of displacement measuring devices: To be agreed.
- Allowable elastic and residual deformation: in accordance with CWCT Standard, clause
3.5.2.
• Air permeability (infiltration): Repeat as above.
• Air permeability (exfiltration): Repeat as above.
• Water penetration resistance - static: Repeat as above.
• Hose test: To CWCT clause 8.16.2.
- Joints to be tested: As drawing.
• Wind resistance - safety: To CWCT clause 8.8.
- Peak test pressure: Equal to 1.5 times design wind pressure specified in clause 313.
- Position of displacement measuring devices: As drawing.
- Allowable residual deformation: in accordance with CWCT Standard, clause 3.6.2.2.
• Impact - safety: To CWCT clause 8.10.
- Location, sequence and number of impacts to be applied: Not applicable.
- Type of soft body impactor: Double tyre to BS EN 12600 .
- Energy of soft body impactor (E): Not applicable.
- Required hard body impact load category: As clause 313.
- Required soft body impact classification: As clause 313.
• Dismantle inspect and record.

550A TEST SEQUENCE - (Note - for client testing see clause 550B)
• Requirement: To CWCT 'Standard for systemised building envelopes', Standard sequence
A, clause 8.12.1, and as follows:
• Air permeability (infiltration): To CWCT clause 8.6.
• Air permeability (exfiltration): To CWCT clause 8.6.
- Allowable exfiltration rates: As clause 345.
• Water penetration resistance - static: To CWCT clause 8.7.1.
• Wind resistance - serviceability: To CWCT clause 8.8.
- Peak test pressure: Equal to design wind pressure specified in clause 313.
- Position of displacement measuring devices: To be agreed.
- Allowable elastic and residual deformation: in accordance with CWCT Standard, clause
3.5.2.
• Air permeability (infiltration): Repeat as above.
• Air permeability (exfiltration): Repeat as above.
• Water penetration resistance - static: Repeat as above.
• Hose test: To CWCT clause 8.16.2.
- Joints to be tested: As drawing.
• Wind resistance - safety: To CWCT clause 8.8.
- Peak test pressure: Equal to 1.5 times design wind pressure specified in clause 313.
- Position of displacement measuring devices: As drawing.
- Allowable residual deformation: in accordance with CWCT Standard, clause 3.6.2.2.
• Impact - safety: minimum To CWCT clause 8.10 - see also clause 550B.

550B ADDITIONAL CLIENT TEST REQUIREMENTS
Taken from the Environmental Design Guide, Adult Medium Secure Services, published by
the Department of Health, 2011
The testing of materials or components is a critical element of the development project.
The project quality plan should clearly identify responsibilities for testing at an early stage
and ensure that the appropriate skills, training, recording and safety measures are in place.
The tests types provided below are designed to replicate a number and/or combination of
actions.
Curtain wall components will pass testing if:
It exhibits no significant failure resulting in the removal of the whole or part of the
component
It does not break or fracture enabling its use as a weapon or means of self-harm
There is no escape or exposure to live electrical wiring, high-temperature pipework or any
other vulnerable services.
If the element or component becomes deformed as a result of testing, this should not
necessarily be classified as a failure provided the extent of deformation does not enable
access to any recess or void within which it is fixed.
Type 1 An attack on a component or element of construction by the use of an
implement or weapon
Implement: 36 x 36x 1000mm hardwood shaft (minimum density 650 kg/m3),
chamfered at one end to replicate the jagged edge/arises/etc. of a vandalised component,
to be planed and all arises rounded
Test: Carry out a sustained attack for a period of 15 minutes (maximum potential period
for a patient to work undetected on a component, notwithstanding the noise that this would
create), including hitting with the flat section of the weapon a minimum of 10 consecutive
blows, attacking end-on with the non-chamfered end of the weapon for a minimum of 10
consecutive blows and, where testing a component, prizing away from the structure to
which it is fixed by the chamfered end of the weapon (the latter applies to the whole or any
part of the component)
Type 2 Attack by punching or kicking
Implement: 1.2 kg rubber mallet (75mm)
Test: Carry out sustained attack with implement comprising of 15 consecutive blows
commencing each blow with the implement withdrawn a minimum of 1000mm away from
the component/element of construction
A component or element of construction will pass testing if:
Type 3 The impact of the full body weight of a person
Implement: Rubber paving maul
Test: Carry out sustained attack with implement comprising of 15 consecutive blows
commencing each blow with the implement withdrawn a minimum of 1000mm way from the
component/element of construction
Dismantle inspect and record results.

635 SITE HOSE TEST
• Requirement: To CWCT 'Standard for systemised building envelopes', 'Standard test
methods for building envelopes' Section 9.
- Joints to be tested: All.
655 WIND LOAD FATIGUE TEST, SMALL SPECIMEN
• Requirement: To CWCT 'Standard for systemised building envelopes', 'Standard test
methods for building envelopes' Section 14.
- Test sequence: As CWCT 'Standard for systemised building envelopes' Table 8.1.
PRODUCTS
710 ALUMINIUM ALLOY FRAMING SECTIONS
• Standard: To relevant parts of BS EN 515, BS EN 573, BS EN 755 and BS EN 12020.
• Alloy, temper and thickness: Suitable for the application and specified finish.
• Structural members: To BS 8118.
712 ALUMINIUM ALLOY SHEET
• Standards: To relevant parts of BS EN 485, BS EN 515 and BS EN 573.
• Alloy, temper and thickness: Suitable for the application and specified finish.
715 CARBON STEEL FRAMING SECTIONS/ REINFORCEMENT
• Standards: To relevant parts of BS 7668, BS EN 10029, and BS EN 10210.
• Thickness: Suitable for the application, and for galvanizing or other protective coating.
730 MECHANICAL FIXINGS
• Stainless steel: To BS EN ISO 3506, grade A2 generally, grade A4 when used in severely
corrosive environments.
• Carbon steel: To BS 4190 and suitable for galvanizing or other protective coating.
• Aluminium brackets, rivets and shear pins: To relevant parts of BS EN 755.
732 ADHESIVES
• General: Not degradable by moisture or water vapour.
735 FIXING ANCHORS
• Type and use: Reviewed and approved by fixing manufacturers. Submit confirmatory
information on request.
• Dimensions: Not less than recommended by their manufacturers.
• Adjustment capability: Sufficient in three dimensions to accommodate building structure
and curtain walling fabrication/ installation tolerances.
737 GLASS GENERALLY
• Standards: To BS 952 and relevant parts of:
- BS EN 572 for basic soda lime silicate glass.
- BS EN 1096 for coated glass.
- BS EN 1748 for borosilicate glass.
- BS EN 1863 for heat strengthened soda lime silicate glass.
- BS EN 12150 for thermally toughened soda lime silicate glass.
- BS EN 13024 for thermally toughened borosilicate glass.
- BS EN ISO 12543 for laminated glass.
• Glass quality: Clean and free from obvious scratches, bubbles, cracks, ripplings, dimples
and other defects.
• Glass edges: Generally undamaged. Shells and chips not more than 2 mm deep and
extending not more than 5 mm across the surface are acceptable if ground out.

741 DISTORTIONAL TOLERANCES ON GLASS
• Measurement of tolerances: After any thermal toughening/ heat strengthening.
• Maximum bow: 0.2% of pane dimension.
• Maximum roller wave:
- For 3 to 5 mm thick glass: 0.5 mm.
- For 12 mm and thicker glass: 0.15 mm.
• Maximum edge dip:
- For 12 mm and thicker glass: 0.25 mm.
745 INSULATING GLASS UNITS
• Standard and labels for hermetically sealed units: To BS EN 1279.
• Label: Each pane.
• Colour of aluminium perimeter spacers: Black.
• Perimeter taping: Not to be used.
• Perimeter seals:
- Resistant to UV light degradation on exposed edges.
- Compatible with structural, assembly and weather sealants.
760A GASKETS
• Material:
- Noncellular rubber to BS 4255-1.
- Cellular rubber to ASTM-C509.
• Continuity : Outer gaskets of single front sealed curtain walling systems and inner gaskets
of drained and ventilated or pressure equalized curtain walling systems must be formed in
a complete frame with sealed joints.
Inner gaskets to be sectional to avoid ligature risk.
Vulcanized rubber gaskets must have factory moulded corner joints.
• Durability: Resistant to oxidation, ozone and UV degradation.
765 WEATHERSTRIPPING OF OPENING UNITS
• Material:
- Noncellular rubber to BS 4255-1.
- Cellular rubber to ASTM-C509.
- Polypropylene woven pile, silicone treated.
• Attachment: Fixed in undercut grooves in framing sections using preformed corners, with
any joints in the length.
770 GENERAL SEALANTS
• Selection: In accordance with BS 6213 from:
- Silicone.
- One part polysulfide.
- Two part polysulfide.
- One or two part polyurethane.
• Classification and requirements: To BS EN ISO 11600.
• Reaction to contact products and finishes: Stable and compatible.
770A GENERAL SEALANTS
• Selection: In accordance with BS 6213 from:
Anti-pick sealant to client approval.
• Reaction to contact products and finishes: Stable and compatible.

772 CURTAIN WALLING JOINT ASSEMBLY SEALANTS
• Material: One part, low modulus silicone to BS EN ISO 11600, type F or G. Neutral curing
where in contact with or close proximity to other products that may be adversely affected
by acetoxy curing.
• Manufacturer: Contractor's choice.
- Product reference: Submit proposals - anti-pick type.
780 THERMAL INSULATION
• Material: PIR rigid board.
- Recycled content: Not applicable.
- Properties: Durable, rot and vermin proof and not degradable by moisture or water
vapour.
• Fixing: Attached to or supported within the curtain walling so as not to bulge, sag,
delaminate or detach during installation or in situ during the life of the curtain walling.
785 VAPOUR CONTROL LAYER
• Acceptable materials:
- Aluminium alloy.
- Carbon steel, galvanized or protective coated.
- Stainless steel.
- Reinforced membranes: Foil, plastics or rubbers, protected both sides by rigid facings/
linings.
• Location: Warm side of thermal insulation.
• Integrity: Continuous, free from gaps and sealed at joints.
FINISHES
810 PROTECTIVE COATING OF CARBON STEEL FRAMING SECTIONS/
REINFORCEMENT
• Treatment: One of the following to all surfaces:
- Hot dip galvanized to BS EN ISO 1461.
- An appropriate equivalent coating to BS 5493, BS EN ISO 12944 or BS EN ISO 14713.
820 PROTECTIVE COATING OF CARBON STEEL MECHANICAL FIXINGS
• Treatment: One of the following to all surfaces:
- Hot dip galvanized to BS EN ISO 1461.
- Sherardized to BS 4921, class 1 coating thickness and passivated.
- Zinc plated to BS EN 12329, coating designation Fe//Zn//C for an iridescent (yellow
passivate) chromate conversion coating or Fe//Zn//D for an opaque (olive green)
chromate conversion coating.
830 POWDER COATING
• Requirement: As section Z31.
FABRICATION AND INSTALLATION
910 GENERALLY
• Electrolytic corrosion: Prevent. Submit proposed methods.
• Fixings: Concealed unless indicated on detailed drawings. Where exposed they must
match material and finish of the products fixed.
• Fabrication: Machine cut and drill products in the workshop wherever possible.
• Identification of products: Mark or tag to facilitate identification during assembly, handling,
storage and installation. Do not mark surfaces visible in the completed installation.

912 METALWORK
• Requirement: As section Z11, unless specified otherwise in this section.
915 GLAZING
• Requirement: As section L40, unless specified otherwise in this section.
• Directional patterned/ wired glass: Generally fix parallel to surround and align adjacent
panes where seen together at close quarters.
917 FIXINGS/ ADHESIVES APPLICATION
920 SEALANT APPLICATION
930 ASSEMBLY
• General: Carry out as much assembly as possible in the workshop.
• Joints (other than movement joints): Rigidly secured, reinforced where necessary and fixed
with hairline abutments.
• Displacement of components in assembled units: Submit proposals for reassembly on site.
955 FIXING ANCHOR INSTALLATION
• Site drilling or cutting into structure: Submit proposals for positions other than shown on
detailed drawings.
• Concrete supporting structure:
- Cast-in inserts: Provide detailed locational information. Protect cavities in inserts from
entry of concrete.
- Edge fixing distances: Not less than recommended by fixing anchor manufacturers.
• Corrective fabrication: Minimize. Where necessary, submit proposals.
970 CURTAIN WALLING INSTALLATION
• Securing to fixing anchors: Through holes formed during fabrication only.
• Tightening mechanical fasteners: To manufacturer's recommended torque figures. Do not
overtighten fasteners intended to permit differential movement.
• Protective coverings: Remove only where necessary to facilitate installation and from
surfaces that will be inaccessible on completion.
975 WELDING
• In situ welding: Not permitted .
980 INTERFACES
• Flashings, closers, etc: Locate and form correctly to provide weathertight junctions with the
curtain walling.
982 IRONMONGERY
• Assembly and fixing: Accurately, using fasteners with matching finish supplied by
ironmongery manufacturer.
• Completion: Check, adjust and lubricate as necessary to ensure correct functioning.

985 MAINTENANCE
• Maintenance manual: Incorporate details within the Building Manual in accordance with
CWCT 'Standard for systemised building envelopes' clause 7.6.1.
- Materials certification and test reports to be included:
Contact details for subcontractors and suppliers.
Design criteria for the curtain wall system.
Product information for components and materials including manufacturers? literature,
COSHH data sheets and recommendations for cleaning maintenance and repair.
Copies of material, components and finishes certification and test report.
A full set of construction drawings, updated to include any changes made up to the time
of completion.
The terms and conditions of any guarantee.
Method statement for means of access for maintenance and for use of any permanent
equipment.
Method statement covering the procedures for replacement of parts that have a design
life less than the design life of the curtain wall system.
Recommendations for routine maintenance and cleaning, including suitable cleaning
agents and lubrication/ adjustments to working parts.
Record book for listing defects, maintenance and repairs.

H13
Structural glass assemblies

H13 Structural glass assemblies
TYPES OF STRUCTURAL GLASS ASSEMBLY
115A STRUCTURAL GLASS ASSEMBLY to education centre link corridor
• Supporting structure: to engineers design.
• System manufacturer: Pilkington Bauglasindustrie. Supplied and installed by Reglit Glass
Architecture.
Ashbury House, 6, Ashton Road, Glasgow G73 1UB. Telephone 0141 6136060 email
fredom@reglit.com.
- Product reference: Pilkington Profilit plus Glazing System .
Glass type:
Walls: Double glazed system SP26 toughened glass with film both panes. U Value
1.4w/m2K required
Pattern - wired cast
Size: 262x60mm
Other requirements:
Units to be thermally broken, with powder coated aluminium frames, fitted with impact
gaskets type 166, and silicone sealant both sides. Note that sealant is required to be anti
-pic.
High level glass to parapet area: Double glazed system SP26 toughened glass. U Value
1.4 w/m2k required
Pattern - cast etched.
Size : 262x60mm
Other requirements:
Units to be thermally broken, with powder coated aluminium frames, fitted with impact
gaskets type 166, and silicone sealant both sides.
Drawings - see design intent document for indicative sketches and GA drawings.
General:
Installed system to meet the requirements for critical glazing areas as stipulated in the
Approved doc N of the england and Wales building regulations.
Method of assembly : Pilkington profilit Plus, glass channels fitted vertically with impact
gaskets type 166, double glazed into proprietory aluminium perimeter framing system.
aluminium frame to be fixed to support structure, around full extent of structural opening.
all materials to be site cut.All glass/ glass and glass / aluminium joints to be sealed with
silicone sealant. (anti-pick where accessible)
Glazing system to be installed in accordance with manufacturers instructions and
recommendations.
Weather resistance:
External glazing including jointing and fixing , must be wind and water tight under all
conditions with full allowance made for permissible deflections.
Integrity:
Calculate glass size, thickness, spans, frame types and location of fixings in accordance
with manufacturers recommendations and BS6399: Part 2: 1997 Standard Method
(making due allowance for any internal presure) to ensure that the glazing will resist all
dead loads and live loads, and accommodate all deflections and thermal movements
without damage.

Nbs specification (updated for contract)

Nbs specification (updated for contract)

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