Tempo:
of bitumen-saturated membrane and cover it with a heavy coating of bituminous material. This covering will help prevent leaks if minor cracks develop in the blocks or joints between the blocks.
Preserved Wood Foundations Preserved wood foundations are constructed according to typical framing methods. Some additional bracing requirements must be met and special fasteners used. The foundations consist of a pressure-treated wood footing plate resting on a granular drainage layer, with pressure-treated bottom and top plates, studs and blocking and pressure-treated plywood sheathing covered with a polyethylene sheet for dampproofing. The space between the studs may be filled with insulation and the interior finished to provide a warm living space either partly or entirely below ground level. A polyethylene sheet ground cover is required under preserved wood foundation floors. In addition, place a polyethylene strip between the bottom plate and the footing to keep the plate dry and to prevent moisture from getting into the wall cavity.
All wood framing and plywood used in a preserved wood foundation system must be pressure treated with chemical preservatives in accordance with Canadian Standards Association (CSA) Standard O80 Series 08: Wood Preservation. The chemicals permanently impregnate the wood cells to levels of penetration and concentration that make the wood highly resistant to attack by decay organisms and insects such as termites. The dried wood is odourless and is only slightly coloured. Lumber and plywood are identified by a certification mark showing that the material has been treated by a plant certified according to CSA Standard O322-02 (R2007) (Figure 46). Wood foundations can be built with a conventional concrete slab floor, a wood floor on sleepers resting on a granular drainage layer, or a suspended wood floor (Figure 47). The required size, species and grade of studs and thickness of plywood depends on stud spacing and backfill height and the number of storeys supported.
46 Certification mark for preserved wood foundation wood and plywood
Company Name and Logo
(name of inspection agency)
CSA O322 CCA 0510
PWF - FBT
type of perservative used first two digits identify the treating plant, the last two the year of treatment
use approved for the material standard CSA 0322, under which material is qualified
Preserved Wood Foundations Preserved wood foundations are constructed according to typical framing methods. Some additional bracing requirements must be met and special fasteners used. The foundations consist of a pressure-treated wood footing plate resting on a granular drainage layer, with pressure-treated bottom and top plates, studs and blocking and pressure-treated plywood sheathing covered with a polyethylene sheet for dampproofing. The space between the studs may be filled with insulation and the interior finished to provide a warm living space either partly or entirely below ground level. A polyethylene sheet ground cover is required under preserved wood foundation floors. In addition, place a polyethylene strip between the bottom plate and the footing to keep the plate dry and to prevent moisture from getting into the wall cavity.
All wood framing and plywood used in a preserved wood foundation system must be pressure treated with chemical preservatives in accordance with Canadian Standards Association (CSA) Standard O80 Series 08: Wood Preservation. The chemicals permanently impregnate the wood cells to levels of penetration and concentration that make the wood highly resistant to attack by decay organisms and insects such as termites. The dried wood is odourless and is only slightly coloured. Lumber and plywood are identified by a certification mark showing that the material has been treated by a plant certified according to CSA Standard O322-02 (R2007) (Figure 46). Wood foundations can be built with a conventional concrete slab floor, a wood floor on sleepers resting on a granular drainage layer, or a suspended wood floor (Figure 47). The required size, species and grade of studs and thickness of plywood depends on stud spacing and backfill height and the number of storeys supported.
46 Certification mark for preserved wood foundation wood and plywood
Company Name and Logo
(name of inspection agency)
CSA O322 CCA 0510
PWF - FBT
type of perservative used first two digits identify the treating plant, the last two the year of treatment
use approved for the material standard CSA 0322, under which material is qualified
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