Materials:Perma-Board
Materials:Perma-Board
PRODUCT GROUP: Proprietary Insulation Overlay Boards
MANUFACTURER: Johns Manville Corporation
ADDRESS: Contact Information
DESCRIPTION
The roofing assembly / material information published in the RCABC Roofing Practices Manual does NOT represent a complete set of the manufacturer’s data or specifications. The preparation of a detailed specification is the responsibility of the design authority.
PERMA-BOARD is a semi-rigid waterproof sheet with a rubberized asphalt core sandwiched within two layers of fibreglass reinforcement. Available with a smooth poly film surface finish or a sanded finish. PERMA-BOARD is compatible with all asphalt roofing systems and is unaffected by moisture and will not rot.
PERMA-BOARD Asphalt Base Board / Overlay
| Uses: | PERMA-BOARD is designed to be used as an overlay to insulation and as a base for modified, built-up and single ply membranes. Elastomeric roofing membranes or built-up roofing may be heat welded or hot mopped directly to PERMA-BOARD, creating a thick waterproofing layer. The asphalt board becomes an integral part of the roof membrane making it stronger and more puncture resistant than it would otherwise be. | |
| Performance Properties: | Tensile Strength @ 23°C | 590 N / 25 mm (135 lb. / in.) |
| Puncture Strength @ 23°C | > 450 N / 1 cm. sq. | |
| Softening Point Temperature | 105°C (221°F) | |
| Maximum Water Absorption | 0.5% | |
| Physical Properties: | Dimensions | 1 m x 2 m (40" x 80" nominal size) |
| Thickness | 4.5 mm (3/16") nominal | |
| Weight | 10.4 Kg (23 lb.) Per sheet nominal | |
| Reinforcement | Two plies, fibreglass mat | |
Download a copy of the Technical Data Sheet