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National Building Code

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Excerpts from the National Building Code, 1985 Exterior wood steps shall not be in direct contact with the ground unless suitability treated with a wood preserver. In localities where termites are known to occur, all stumps, roots, and other wood debris shall be removed from the soil to a minimum depth of 300 mm in unexcavated areas under a building. Floors on the ground and exterior surfaces of walls below ground shall be waterproofed. Unless... unnecessary, the bottom of every exterior foundation wall shall be drained by drainage tile or pipe laid around the exterior of the foundation... or by a layer of gravel, or crushed rock... The building shall be located or the building site graded so that water will not accumulate at or near the building. Exterior foundation walls shall extend not less than 150 mm above finished ground level. (In localities where termites are known to occur) foundation walls of hollow unit masonry supporting floor joists shall be capped with at least 50 mm of solid masonry or concrete, or have the top course filled with mortar or concrete... In localities where termites are known to occur, joints between slabs-on- ground and foundation walls, and spaces around pipe, conduit or ducts that penetrate such slabs shall be filled with bitumen. Wood columns shall be separated from concrete in contact with the ground by 0.05 mm polyethylene film or Type S roll roofing. An access opening of not less than 500 mm by 700 mm shall be provided to each crawl space where the crawl space serves a single dwelling unit... Natural ventilation for crawl spaces shall be provided to the outside air by not less than (0.1 square meters) of unobstructed vent area for every (50 square meters) of floor area. Vents for crawl spaces shall be designed to prevent the entry of snow, rain, and insects... Vents for crawl spaces shall be uniformly distributed on opposite sides of the building. In localities where termites are known to occur, the (ground level) shall be not less than 450 mm (below the level of the joists)... (Unless unnecessary)...the crawl space floor and access trenches shall be sloped to drain to a sewer, ditch or dry well. A ground cover consisting of not less than 50 mm of asphalt or 10 MPa portland cement concrete, of Type S roll roofing or 0.01 mm polyethylene shall be provided in every crawl space. Joints in sheet-type ground cover shall be lapped not less than 100 mm and weighted down. Ends of wood joists or beams and other members framing into masonry or concrete shall be treated to prevent decay where the bottom of the member is at or below ground level, or a 12 mm air space shall be provided the end and sides of the member. Wood framing members that are not pressure treated with a wood preservative and which are supported on concrete in contact with the ground or fill shall be separated from the concrete by at least 0.05 mm polyethylene film or Type S roll roofing, except that such damp-proofing material is not required where the wood member is at least 150 mm above the ground. Vapour barriers shall be installed on the warm side of the insulation... Where downspouts are provided and are not connected to a sewer, extensions shall be provided to carry rain water away from the building... Caulking shall be provided where required to prevent the entry of water away from the building... Wood sleepers supporting finished flooring over a concrete base on the ground shall... be treated with a soaking of acceptable wood preservative.

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