Presentation by Jim Hooker of SPRA (Single Ply Roofing Association) 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/
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How to Avoid Leaky Roofs #PerfectRoof
1. Jim Hooker BSc FIoR
Technical Director
How to avoid leaky roofs
SIG Design & Technology technical seminar
2. How do you make a roof?
Client
Main contractor
Specialist
Designer
Manufacturer
3. Client
• Define performance requirement
– Secondary functions
– Access
– Appearance
– Maintenance strategy
• Budget for sustainability
• Be prepared to review
4. Designer
• Respond to performance requirement
• Don’t just replicate the last job
• Defend the specification
• Don’t subcontract key design features:
– Drainage and U-value
– Dimensional constraints
– Loadings
– Detailing
• Be ready to REVIEW
5. Main contractor
• Respect NBS Specification J42
– 210 Secure, free-draining, weatherproof
– 610 Grading to correct falls…Moisture
content and stability of substrate: Must
not impair integrity of roof.
– 920 Electronic roof integrity test …Testing
authority: . . . . . .
• Plan and manage protection
• Plan sequencing
• Check installer credentials
6. Manufacturer
• Not just a product
• Provide a holistic service
– Current certification
– Calculation service
– Indemnity for design advice
– Off-site installer training linked to VQ
– Installer database
– On-site inspection and enforcement
• Manage expectations on appearance
7. Specialist
• Keep up to date
• Be proactive – assist in design
• Develop the workforce
– Train
– Card
– Supervise
• Protect the work
10. What is a centre of excellence?
Guidance
• Design Guide
• Product evaluation
• Drainage
• Acoustics
• Sealants
• Safety
• Guarantees
• Testing for integrity
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11. Component standards
• PIR insulation
• EPS insulation
• XPS insulation
• MW insulation
• Fasteners
• Rooflights
• Roof access hatches
• Top-fixed safety anchors
• Membrane-line gutters
• Roof edge and lightning protection
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What is a centre of excellence?
BIM Objects
12. A careers centre
• Resources and curriculum
• Apprenticeship
• Upskilling
• Product installation training
What is a centre of excellence?
13. SPRA is that resource
A modern trade association
• Supply chain
• Accountable
• In touch
• Market-focussed
• Web-based media + human helpline
• Developing sustainable systems
• Committed to developing the workforce
15. Design checklist
• Falls: minimum 1:80 finished “at any point.”
• Keep it simple: avoid gutters and sumps.
• Wind loading: accurate, calculated, applied.
• Dead loading: pedestrian, services.
• Thermal: backstop, average, bridging.
• Warranty: ensure continuity.
• Integrity testing: design for it.
• Detailing: height, weathering, clearance to build.
Use for design development, review and survey
16. Products - critical factors
• Independent certification: SPRA requires BBA.
• Compatibility: with adjacent components.
• Appearance: it must match expectations.
• Repairable: straightforward, reliable procedure.
• Support: SPRA requires full design support.
• Track record: examples of similar UK installations.
• Details: for all system types.
• Training: quality and duration of course.
• Field inspection: frequency; record.
17. Installation - critical factors
No British Standards - SPRA sets industry standards
• Protect: deck, and roof system.
• Storage: be aware of requirements.
• Wind: use of adhesives/layout of fasteners.
• Welding: tests, samples, inspection.
• Access: specialist must have possession.
• Testing: use a qualified independent provider.
18. Green roofing and SUDS
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