Problems with specifications account for 25% of PI claims.Problems with specifications can lead to dispute, especially or equal specifications.The quality of specifications has declined over the past 20 years. Source RIBA providers network Turn ideas into reality.
Specifying Roofing, Cladding and Rain-screen systemsHow important are the fasteners ?What are the Design Considerations ?Presenter Gavin Luke to Turn ideas into reality.
Agenda SFS intec - a profile Prevention of Corrosion in systems Prevention of Corrosion in Fasteners Stainless Steel vs Carbon Steel Product selection - Structural and Durability Case Histories Solutions & new Technologies Meaningful Warranties The Route to Specification Turn ideas into reality.
SFS intec Construction DivisionManufacturers of Specialist fasteners and sealants forRoofing / Cladding / Rain-screen / Timber / Flat Roofs Glass Turn ideas into reality.
CorrosionA fact of life with carbon steel Turn ideas into reality.
Modern Construction MethodsThe Enemy….. Corrosion of Carbon Steel Turn ideas into reality.
BS7453: 1992 Guide to durability of buildings.Temporary Agreed Period Non permanent site huts. Up to 10 Years Temporary exhibition buildings.Short Life Minimum 10 Years Temporary class rooms. Office internal refurbishments.Medium Life Minimum 30 Years Most industrial buildings. Housing refurbishment.Normal Life Minimum 60 Years New health and education buildings. New housing. High quality refurbishment of public buildings.Long Life Minimum 120 Years Civic and other high quality buildings Turn ideas into reality.
BS5427 1996 Code of practice for the use ofprofiled sheet for roof and wall cladding.Carbon steel fasteners should not be used in:Marine environment 2km from coast.Coastal environment 10km from coast.Any environment subject toairborne pollution/Industrialised.Fasteners are not replaceable.Fasteners are not repairable. Turn ideas into reality.
Preventing Corrosion in metals Coatings - painting; enamelling; powder coating; plastic coating Galvanization - a zinc coating created by hot dipping or electroplating (Zinc carbonate layer is eventually produced, which corrodes much more slowly ?) Resistant metals - Aluminium; Zinc; Lead; Copper Alloys - Carbon; Chromium; Nickel = Stainless Steels BY PASSIVATION Turn ideas into reality.
Design Considerations - Corrosion of Fasteners Turn ideas into reality.
Galvanic attackBad designThe cathode drives the corrosion againstthe smaller anodeCathode ( sheet ) is not affectedAnode ( fastener ) is sacrificedFastener immediately at risk !! Turn ideas into reality.
Anodic - more activeChoice of material important Magnesium Zinc Aluminium Cadmium Carbon / Mild Steel SteelThe Galvanic Table Wrought Iron Stainless Steel (Ferritic) Tin Lead Brass Copper Bronze Copper Nickel Stainless Steel (Austenitic) Titanium Silver Direction of Gold Activity Cathodic - less active "noble" Turn ideas into reality.
Design ConsiderationsAn Example - Ventilated Facades & Rainscreens Turn ideas into reality.
Design Considerations - Facades and Rainscreen CladdingThe Reality• External Panel (Specified by Architect)• Support Frame (Chosen by Contractor)• Insulation (Chosen by Contractor)• VCL (Chosen by Contractor)• Fasteners ??? (Chosen by Contractor)The IssueMix and Match - a recipe for disaster Turn ideas into reality.
Bracket to StructureStainless Steel to MasonryStainless Steel fasteners - into SteelstructureStainless steel fastener - into timberrails Turn ideas into reality.
Rail to Bracket -Panel to RailStainless steel to AluminiumTurn ideas into reality.
Specify Stainless SteelNot the solutionFerritic - 12% chromiumMartensitic - (400 series)11% chromium plus nickelAustenitic 304 / 316 * (300 series)17% chromium / 10% nickel / molybdenum* recommended by BS 5427 Turn ideas into reality.
Design Considerations - Structural Drill Point / Efficient Fastening Pull out values / Fastener Frequency Workmanship & Waste Durability and Warranty Cost ???? Turn ideas into reality.
A Fastening System - not a screw !! Under-head recess 3mm, 40 shore epdm washer Sharks Tooth stainless steel thread Longer, stronger drill point welded to thread Turn ideas into reality.
Improved pull out values means fewer fasteners into lighterconstruction (1.2mm steel reduced from 1.6mm)Improved pull out values combined with accurate wind load testing 20m X 50m X 8m METAL CLAD BUILDING 10,000 fastener required from a competitor = 5555 no at .011p =Using lightweight construction reduces the number of fasteners to = 1m² hole in structure Turn ideas into reality.
New technologies - improving performance Turn ideas into reality.
CLAMPING fastener - not just a stitcher ! Turn ideas into reality.
The SFS IntecMobile Training and Demo Van Educating the Contractor On Site Technical Support Lakesmere Turn ideas into reality.
Design Considerations Case Histories Turn ideas into reality.
The Olympic Aquatic Centre - Design ConsiderationChlorine resistanceOverall 25 yr Warranty Austenitic Stainless Steel Grade 304 Super Austenitic Stainless Steel below VCL Turn ideas into reality.
Greenock Waterside - Design Considerations -Corrosion of fasteners in Marine Environment25 yr warranty Austenitic Stainless Steel fasteners Turn ideas into reality.
Bagland Paper Mills - Design ConsiderationsCoastal Location - corrosion of envelope fastenersHigh Humidity interior - internal corrosion of fastenersCold bridging on flat roofOverall 25 yr warrantyAustenitic Stainless steel fasteners both externally and internallyThermally broken austenitic stainless steel fasteners on flat roof Turn ideas into reality.
BAE - SamlesburySnap off fastener on roof / security fastener on walls Turn ideas into reality.
Cardiff Millennium Centre - Design ConsiderationsLow Profile / colour-matched cladding fastenerGalvanic reaction to copper cladding25 yr warrantySnap off fastener on standing seam roofLow profile, colour matched stainless steel fastener on cladding Turn ideas into reality.
Case Studies - The Common Factor……….. A 25 year + Warranty - to match Design Life Requirements Turn ideas into reality.
Warranty considerationPV panels - payback period 25 yrsFastening system should have25 yr warranty Turn ideas into reality.
Warranty myth - fasteners are covered by the system manufacturer Warranty myth - its meaningful Turn ideas into reality.
Austenitic 304/316 StainlessSteel fasteners and A+ PinkStrip Butyl Sealant- a meaningful warranty1. Under the Warranty, the companywill make good that section of theroof/cladding by replacement orotherwise, any failure resulting fromsealant or fastener non-performanceBacked by Insurance coveringconsequential losses (£20M perproject) Turn ideas into reality.
Specification Support - SFS intec add value Product / Technical Information Wind loadings / Pull out values NBS Specification System Specification Attachment Clause 197A Fastener and sealant manufacturers must provide a written warranty of 20 - 30 years and an independent Public Liability Insurance of £20 million per project. Accredited Contractors Turn ideas into reality.
Summary - Any questions SFS intec - a profile Prevention of Corrosion in systems Prevention of Corrosion in Fasteners Stainless Steel vs Carbon Steel Product selection - Structural and Durability Case Histories Solutions & new Technologies Meaningful Warranties The Route to Specification Turn ideas into reality.