Presentation by Robin Gill of Make Architects at the 2015 #PerfectRoof seminar at The Building Centre in London 1st October 2015. More at: http://www.singleply.co.uk/live-blog-8-steps-to-the-perfectroof-ribaj-morning-seminar-2015/

1. 8 Steps to the perfect roof
Presentation
01.10.15
Hiscox Building

2. 2 Section Subject
Hiscox Building
–
Brief
Integrity
Excellence
Courage
Quality
Respect
• Bespoke office building for owner occupiers Hiscox
• Contemporary design which reflects Hiscox brand values

3. 3 Section Subject
Site
–
Location
10 minute walk20 minute walk
Train station
York Minster

4. 4 Section Subject
Site
–
Local context
Site
City Wall
Black Swan
Hungate Masterplan
The Stonebow
Site
Aldwark
St. Saviour’s Place
Peasholme Green
Foss
Spen Lane
Dundas Street
St. Cuthbert’s Church
York Minster
St Anthony’s Hall

5. 5 Section Subject
Site
–
History
The Wool Market, 1849

6. 6 Section Subject
Site
–
Archeology

7. 7 Section Subject
Site
Site
–
Masterplan

8. 8 Section Subject
Concept
–
Weave & the wall

9. 9 Section Subject
Design
–
Form

10. Ground floor Level 01
Level 03Level 02
Ground floor atrium
Level 03 roof terrace
Design
–
Plan

11. Design
–
Facade - Brick
/Page No. 14 Black Swan Sketchbook no. 5 FMDC Compiled façade information - draft stage d FMDC 035 Draft 1 25-Sep-13
3d sketchup model of typical bay
Scale 1:5@A3 approx.

12. Design
–
Facade - Brick

14. /Black Swan /Sketchbook 2 /Glazed wall options study /FMDC 035 /Draft 1 /07-Aug-13
1 - verticals at 2m centres without horizontals
1:20@A3 approx.
Option 1 - verticals at 2m centres without horizontals
• 400x200mm steel oval sections at 2m centres, spanning
13.5m, gravity supported from the ground.
• DGU’s with no transoms at 2m wide by 4.25m high.
• Heat strengthened glass required structurally.
• The glass is too thick to span 3m horizontally, hence the 2m
spacing of the verticals.
• Likely to be a more expensive solution than option 2.
• Primary frame columns at 6m centres. Façade divorced from
primary structure.
• No/limited connections between primary frame and façade
oval sections. The ovals in front of columns could be propped
to the structure behind resulting in the same size ovals but
with thinner wall thicknesses (potential small saving).
• Achieves a vertical aesthetic and a ‘special’ exciting design.
• 500 Brook Drive, Green Park, Reading provides good
precedent.
Curved glass procurement options @ 2m wide x 4.25m high.
• Suppliers include Seele, Fini Glass and Cricursa.
• Roller wave issues with heat strengthened glass, therefore a
risk of poorer optical quality at corners.
• Laminated heat strengthened glass required to both internal
and external panes at ground floor and to ensure safety and
redundancy in the event of breakage. This results in further
issues with optical quality due to the multiple layers of roller
wave.
/Page No. 4 /Black Swan /Sketchbook 2 /Glazed wall options study /FMDC 035 /Draft 1 /07-Aug-13
/Option 1 - verticals at 2m centres without horizontals
1:200 & 1:20@A3 approx.
Option 1 - verticals at 2m centres without horizontals
• 400x200mm steel oval sections at 2m centres, spanning
13.5m, gravity supported from the ground.
• DGU’s with no transoms at 2m wide by 4.25m high.
• Heat strengthened glass required structurally.
• The glass is too thick to span 3m horizontally, hence the 2m
spacing of the verticals.
• Likely to be a more expensive solution than option 2.
• Primary frame columns at 6m centres. Façade divorced from
primary structure.
• No/limited connections between primary frame and façade
oval sections. The ovals in front of columns could be propped
to the structure behind resulting in the same size ovals but
with thinner wall thicknesses (potential small saving).
• Achieves a vertical aesthetic and a ‘special’ exciting design.
• 500 Brook Drive, Green Park, Reading provides good
precedent.
Curved glass procurement options @ 2m wide x 4.25m high.
• Suppliers include Seele, Fini Glass and Cricursa.
• Roller wave issues with heat strengthened glass, therefore a
risk of poorer optical quality at corners.
• Laminated heat strengthened glass required to both internal
and external panes at ground floor and to ensure safety and
redundancy in the event of breakage. This results in further
issues with optical quality due to the multiple layers of roller
wave.
Design
–
Facade - Glass

16. Design
–
Interior

18. 18 Section Subject
Design
–
Interior

20. Terrace
–
Level 3

21. Terrace & roof
–
Flat roof construction

22. Questions
–
1. What were the particular challenges for
roofing the building?
2. How did the use of hot melt help with the
challenges?

23. Challenges
–
1. Programme • Short construction programme - 14 months
• Simple, fast & easy to install
• Rapid setting allows for fast turn around for
follow on trades
• Tried & tested system

24. Challenges
–
1. Programme
2. Budget
• Design & Build contract
• Variety of procurement options
• Hot melt system approximately 25% cheaper
than a cold applied liquid plastic system

25. Challenges
–
1. Programme
2. Budget
3. Curved geometry

26. Challenges
–
1. Programme
2. Budget
3. Curved geometry
4. Sustainable
• Breeam
• Recycled content of Permatec is 43%
• Use with green roof & PV panels

27. Challenges
–
1. Programme
2. Budget
3. Curved geometry
4. Sustainable
5. Variety of details

28. Challenges
–
Detail 1

29. Challenges
–
Detail 1

30. Challenges
–
Detail 2

31. Challenges
–
Detail 3
8StepstotheperfectroofPage28
Penetrations: The magical Pitch Pocket
Pitch pockets used for all
vertical penetrations. Services /
handrails / posts / I beams etc
1. Minimum 50mm galvanised
metal formwork bonded into hot
melt.
2. This is then secured with more
hot melt or mechanically fixed.
3. Filled with PermaTEC hot melt
4. Protection felt then covers
pitch pocket

32. Challenges
–
Bespoke & standard details

33. Summary
–