A 1 m x 2m x. 5mm thick, semi flexible, polypropylene based board, double layered with 5mm integrated perpendicular support spacers at 4mm intervals, to be applied as a protection to the waterproof membrane.
Resistance to chemicals:-
HEAVY-DUTY board are not affected by mineral oils, solvents, acids, bases, and salts; that are usually found in a contaminated water table and in soil components. HEAVYDUTY board does not absorb water, which adds to the impermeability of the waterproof membrane.