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LEGERBOARD  panels are composed of Type II, 7/8”
expanded polystyrene (EPS) and a 7/16” oriented strand
board (OSB). The expanded polystyrene (EPS) provides a
thermal envelop for the structural wall, whereas the OSB
sheet reinforces the wall against diagonal distortion.

LEGERBOARD R4 panels are designed to break the thermal
bridge between the structure and the exterior finish
and conform to the National Building Code. Their solidity
facilitates the installation of exterior finishings.

Physical Properties Imperial Metric TEST LEGERBOARD
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 psi (kPa) ASTM: D-1621 16 (110)
Water vapor permeability (max.) - (ng/Pa.s.m2) ASTM: E-96 200 (insulation panel only)
Water absorption (max.) % % ASTM: D-2842 4