Legerboard is a composite panel made up of type-2 expanded polystyrene insulation and a (7/16 in.) oriented strand board (OSB). The expanded polystyrene (EPS) insulation acts as a protection for the structural wall, whereas the OSB sheet reinforces the wall against diagonal distortion. The OSB sheet is available either with or without perforations in two sizes: (4 ft. × 9 ft. and 4 ft. × 8 ft.)
Legerboard R-4 panels are designed to break the thermal bridge between the structure and the exterior finish, in compliance with the National Building Code. Their solidity facilitates the installation of exterior finishings.
|Thermal resistance: r-value at 75ºF (24ºc) for 1 in (25 mm) thickness||(hre.pi2 .°F) / BTU||(m2 °C W) / W||ASTM: C-518 C-177||R4 1 5/16″|
|Compressive strength (min.) at 10% distortion||lb/po2 ou psi||(kPa)||ASTM: D-1621||16 (110)|
|Water vapor permeability (max.)||–||(ng/Pa.s.m2)||ASTM: E-96||200 (seulement pour l’isolant)|
|Water absorption (max.)||%||%||ASTM: D-2842||4|