Jim Hooker BSc FIoRTechnical Director

How to avoid leaky roofsSIG Design & Technology technical seminar

How do you make a roof?

Client

Main contractorSpecialist

Designer

Manufacturer

Client

• Define performance requirement– Secondary functions– Access– Appearance– Maintenance strategy

• Budget for sustainability• Be prepared to review

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

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

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

Specialist

• Keep up to date• Be proactive – assist in design• Develop the workforce

– Train– Card – Supervise

• Protect the work

Everybody should…

Exploit the centre of excellence

What is a centre of excellence?Guidance

• Design Guide• Product evaluation • Drainage• Acoustics• Sealants• Safety• Guarantees• Testing for integrity

ALL FREE DOWNLOADS

FREE TELEPHONE ADVICE

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

ALL FREE DOWNLOADS

What is a centre of excellence?

BIM Objects

A careers centre • Resources and curriculum• Apprenticeship• Upskilling• Product installation training

What is a centre of excellence?

SPRA is that resourceA modern trade association

• Supply chain• Accountable• In touch• Market-focussed• Web-based media + human helpline• Developing sustainable systems• Committed to developing the workforce

Who is SPRA?

13 Membrane

manufacturers

(>70% of output)

26 Associates

40

Contractors

Individual trained installers

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

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.

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.

Green roofing and SUDS

Bio-diverse Extensive - sedum

Bio-diverse in education

Extensive (sedum) in education

Extensive (sedum) in leisure

Rain-screen

Replication

enquiries@spra.co.uk

0845 1547188

Any comments?