Excerpts from the National Building
Code, 1985
9.8.9.1. Exterior wood steps shall not be in direct
contact with the ground unless suitability treated with a wood preserver.
9.12.1.1. 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.
9.13.1.1. Floors on the ground and exterior surfaces of
walls below ground shall be waterproofed.
9.14.2.1. 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...
9.14.6.1. The building shall be located or the building
site graded so that water will not accumulate at or near the building.
9.15.4.3. Exterior foundation walls shall extend not less
than 150 mm above finished ground level.
9.15.5.1. (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...
9.16.5.1. 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.
9.17.4.3. Wood columns shall be separated from concrete in
contact with the ground by 0.05 mm polyethylene film or Type S roll roofing.
9.18.2.1. 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...
9.18.3.2. 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.
9.18.3.3. Vents for crawl spaces shall be designed to
prevent the entry of snow, rain, and insects...
9.18.3.4. Vents for crawl spaces shall be uniformly
distributed on opposite sides of the building.
9.18.4.1. In localities where
termites
are known to occur, the (ground level) shall be not less than 450 mm (below
the level of the joists)...
9.18.5.1. (Unless unnecessary)...the crawl space floor and
access trenches shall be sloped to drain to a sewer, ditch or dry well.
9.18.6.1. 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.
9.23.2.2. 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.
9.23.2.3. 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.
9.26.5.1. Vapour barriers shall be installed on the warm
side of the insulation...
9.27.15.1. Where downspouts are provided and are not
connected to a sewer, extensions shall be provided to carry rain water away
from the building...
9.28.4.1. Caulking shall be provided where required to
prevent the entry of water away from the building...
9.31.1.3. 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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