Rigid PIR insulation with plywood laminate for warm flat roofs on domestic projects.
Plylok is a high performance rigid polyisocyanurate (PIR) foam board for use in warm flat roofs under traditional bituminous waterproofing and single ply membranes. It is faced both sides with a multi-layer coated aluminium foil with a layer of 6mm plywood bonded for additional strength and rigidity.
Manufactured to ISO 9001 Quality and ISO 14001 Environmental Management Systems
Manufactured using a blowing agent with zero ozone depletion potential (ODP) and low global warming potential (GWP)
Low thermal conductivity of 0.022 W/m·K
No requirement for roof ventilation and condensation within the roof is avoided as the structure is maintained at the internal temperature
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Standard product features
2400 x 1200 mm.
0.022 W/m·K (insulation only).
Euroclass F (EN 13501-1), Class 1 (BS 476-7) (insulation only).
Exceeds 150 kPa at yield, and suitable for loads associated with maintenance traffic. Care must be taken to avoid damage to boards by impact or concentrated loads during installation.
To ensure adequate drainage the roof should have a minimum finished fall of 1:80. This may mean designing for twice the minimum finished fall to account for building inaccuracies, roof deflection and building settlement.
With increasing levels of insulation it is important to ensure the continuity of insulation at the junction of elements.
- Wind uplift:
The wind uplift force exerted on the roof will vary according to geographical location, site location and building height. Reference should be made to BS 6399 and the membrane manufacturer’s recommendations for the number of fixings and the fixing pattern.