Dampproofing of Floors-on-Ground
(1) Where dampproofing is installed below the floor, it shall consist of,
(a) polyethylene not less than 0.15 mm thick with joints lapped not less than 100 mm,
(b) Type S roll roofing with joints lapped not less than 100 mm, or
(c) rigid extruded/expanded polystyrene with sealed or ship-lapped joints that has,
(i) sufficient compressive strength to support the floor assembly, and
(ii) a water vapour permeance complying with Clause 9.13.2.2.(2)(b).
(2) Where dampproofing is installed between a floor-on-ground and a finished floor, it shall consist of,
(a) rigid extruded/expanded polystyrene with sealed or ship-lapped joints that has,
(i) sufficient compressive strength to support the floor assembly, and
(ii) a water vapour permeance complying with Clause 9.13.2.2.(2)(b), or
(b) polyethylene not less than 0.05 mm with joints lapped not less than 100 mm.
Article 9.13.2.6 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
