OBC 2006 › Division B

9.12.2.2.

Version 1 — in force 1 January 2010

In force · amended

Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

In force · amended

Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 9.12.2.2. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 503/09, cl. 152 · ext ← current

In force 2010-01-01

OBC 2012 · continues as 9.12.2.2. — Pro

9.12.2.2. — Minimum Depth of Foundations

(1) Except as provided in Sentences (4) and (5), the minimum depth of foundations below finished ground level shall conform to Table 9.12.2.2.

(2) Where a foundation is insulated in a manner that will reduce the heat flow to the soil beneath the footings, the foundation depth shall conform to that required for foundations containing no heated space.

(3) The minimum depth of foundations for exterior concrete steps with more than 2 risers shall conform to Sentences (1), (2) and (5).

(4) Concrete steps with 1 and 2 risers are permitted to be laid on ground level.

(5) 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.

(6) The foundation depths required in Sentence (1) do not apply to foundations for,

(a) buildings,

(i) that are not of masonry or masonry veneer construction, and

(ii) whose superstructure conforms with the requirements of the deformation resistance test in CAN/CSA-Z240.2.1, “Structural Requirements for Mobile Homes”, or

(b) accessory buildings,

(i) that are not of masonry or masonry veneer construction.,

(ii) not more than 1 storey in building height,

(iii) not more than 55 m² in building area, and

(iv) where the distance from the finished ground to the underside of the floor joists is not more than 600 mm.

(7) The foundation depths required in Sentence (1) do not apply to foundations for decks and other accessible exterior platforms,

(a) that are of not more than 1 storey,

(b) that are not more than 55 m² in area,

(d) that are not supporting a roof, and

(e) that are not attached to another structure, unless it can be demonstrated that differential movement will not adversely affect the performance of that structure.

Text · e-Laws consolidated snapshot

Table 9.12.2.2. Minimum Depths of Foundations Forming Part of Sentence 9.12.2.2.(1)


Column 1	Column 2	Column 3	Column 4	Column 5
Type of Soil	Minimum Depth of Foundation Containing Heated Basement or Crawl Space⁽¹⁾		Minimum Depth of Foundation Containing no Heated Space⁽²⁾
Type of Soil	Good Soil Drainage	Poor Soil Drainage	Good Soil Drainage	Poor Soil Drainage
Rock	No limit	No limit	No limit	No limit
Coarse grained soils	No limit	No limit	No limit	Below the depth of frost penetration
Silt	No limit	No limit	Below the depth of frost penetration⁽³⁾	Below the depth of frost penetration
Clay or soils not clearly defined	1.2 m⁽³⁾	1.2 m	1.2 m but not less than the depth of frost penetration⁽³⁾	1.2 m but not less than the depth of frost penetration

Notes to Table 9.12.2.2.:

⁽¹⁾Foundation not insulated to reduce heat loss through the footings.

⁽²⁾Including foundations containing heated space insulated to reduce heat loss through the footings.

⁽³⁾Good soil drainage to not less than the depth of frost penetration.