Suitable for use in both new build and refurbishment projects.

ProTherm PIR PLY is a rigid polyisocyanurate (PIR) foam core faced with an exterior grade FSC-certified Grade 3 OSB and an aluminum foil backing.

Features and benefits:

• Factory laminated 6 mm oriented strand board (OSB).
• The PIR foam core is temperature tolerant and withstands the application of hot bitumen to the surface temperature of 240°C.
• ProTherm PIR PLY is covered by BBA Certificate No. 16/5341.
• Typical compressive strength for the foam exceeds 150 kPa when tested to BS EN 826: 1996 Thermal Insulating Products for Building Applications-Determination of compressive behavior.
• The product is stable, rot proof and durable and will remain effective as an insulation system at least as long as that of the waterproof covering. Durability depends on the method of application, the supporting structure and conditions of use.
• The insulation core and facings resist attack by mold and microbial growth, and do not provide any food value to vermin.
•  Exterior grade OSB Grade 3 has inherent moisture resistant qualities.
• ProTherm PIR PLY resists attack from dilute alkalis and acids, mineral oil and petrol. The foam is not resistant to ketonic solvents. Damaged boards should not be used.
• The low emissivity of the reflective foil can cut radiation heat transfer across an adjoining air-space The thermal conductivity of the foam and OSB is 0.022 W/m·K and 0.14 W/m·K respectively.
• Foil facings have a high water vapour resistance and will, therefore, provide significant resistance to water vapour transmission. This will minimize both surface and interstitial condensation. The necessity for the inclusion of a water vapour control layer in the roof construction should be assessed in accordance with BS 6229: 2003 Code of Practice for flat roofs with continuously supported coverings. Consideration should also be given to BS5250: 2002 Code of Practice to control condensation in buildings.
• PIR foam is CFC/ HCFC free and has a Zero Ozone Depletion Potential (ODP) with a Global Warming Potential (GWP) of 3, less than the target value of 5. It has a BRE Green Guide rating of A. ProTherm PIR PLY is manufactured from FSC (Forest Stewardship Council) certified OSB Grade 3.
• Achieves BS476-7: 1997 Class 1 rating for surface spread of flame. Finished with 3 layer built-up felt and chippings, the roof will attain an FAA rating when tested to BS 476: 1988 External Fire Exposure Test. Further details on the fire performance may be obtained from the manufacturer's technical services.
• Depending on the chosen waterproofing system, ProTherm PIR PLY is suitable for use on roof decks that are subject to limited maintenance foot traffic. Walkways should be provided on roofs requiring regular pedestrian access. The roof should be boarded out with protective boarding whenever site work is to take place after the roof board has been laid and the roof made watertight.