| 9.12.2.2. |
Minimum Depth of Foundations
- Except as provided in Sentences (4) to (7), the minimum depth of foundations below finished ground level shall conform to Table 9.12.2.2.
Table 9.12.2.2.
Minimum Depths of Foundations
Forming Part of Sentence 9.12.2.2.(1)
Notes to Table 9.12.2.2.:
(1) Foundation not insulated to reduce heat loss through the footings.
(2) Including foundations insulated to reduce heat loss through the footings.
(3) Good soil drainage to not less than the depth of frost penetration.
(4) See Note A-Table 9.12.2.2.
- Where a foundation is insulated in a manner that will reduce heat flow to the soil beneath the footings, the foundation depth shall conform to that required for foundations containing no heated space. (See Note A-9.12.2.2.(2).)
- The minimum depth of foundations for exterior concrete steps with more than 2 risers shall conform to Sentences (1), (2) and (5).
- Concrete steps with 1 and 2 risers are permitted to be laid on ground level.
- The foundation depths required in Sentence (1) are permitted to be decreased where experience with local soil conditions shows that lesser depths are satisfactory, or where the foundation is designed for lesser depths.
- The foundation depths required by Sentence (1) do not apply to foundations for
- buildings
- that are not of masonry or masonry veneer construction, and
- whose superstructure conforms to the requirements of the deformation resistance test in CSA Z240.2.1, "Structural Requirements for Manufactured Homes," or
- accessory buildings
- that are not of masonry or masonry veneer construction,
- not more than 1 storey in height,
- not more than 55 m2 in building area, and
- where the distance from finished ground to the underside of the floor joists is not more than 600 mm.
- The foundation depths required by Sentence (1) do not apply to foundations for decks and other accessible exterior platforms
- of not more than 1 storey,
- not more than 55 m2 in area,
- where the distance from finished ground to the underside of the joists is not more than 600 mm,
- not supporting a roof, and
- not attached to another structure, unless it can be demonstrated that differential movement will not adversely affect the performance of that structure.
- Where decks or other accessible exterior platforms are supported on surface foundations supported on other than coarse-grained soil with good drainage or rock, access to the foundation positions to permit re-levelling of the platform shall be provided
- by passageways with a clear height under the platform of not less than 600 mm and a width of not less than 600 mm, or
- by installing the decking in a manner that allows easy removal.
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