OBC 2006 › Division B

9.15.4.2.

Version 1 — in force 2 April 2007

In force · amended

Verified · covered Verified against the 2007-04-02–2007-06-30 consolidation, whose range covers the query date. How to read this

In force · amended

Verified · covered Verified against the 2007-04-02–2007-06-30 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · renumbered from 9.15.4.1. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 137/07, cl. 55 · ext ← current

In force 2007-04-02

OBC 2012 · continues as 9.15.4.2. — Pro

9.15.4.2. — Foundation Wall Thickness and Required Lateral Support

(1) Except as required in Sentence (2), the thickness of foundation walls made of unreinforced concrete block or solid concrete and subject to lateral earth pressure shall conform to Table 9.15.4.2.A. for walls not exceeding 2.5 m in unsupported height.

(2) The thickness of concrete in flat insulating concrete form foundation walls shall be not less than the greater of,

(a) 140 mm, or

(b) the thickness of the concrete in the wall above.

(3) Foundation walls made of flat insulating concrete form units shall be laterally supported at the top and at the bottom.

(4) Where average stable soils are encountered and wind loads on the exposed portion of the foundation are no greater than 0.70 kPa, the thickness and reinforcing of foundation walls made of reinforced concrete block and subject to lateral earth pressure shall conform to Table 9.15.4.2.B. and Sentences (5) to (10).

(5) For concrete block walls required to be reinforced, continuous vertical reinforcement shall,

(a) be provided at wall corners, wall ends, wall intersections, at changes in wall height, at the jambs of all openings and at movement joints,

(b) extend from the top of the footing to the top of the foundation wall,

(c) where foundation walls are laterally unsupported at the top, have not less than 600 mm embedment into the footing, and

(d) where foundation walls are laterally supported at the top, have not less than 50 mm embedment into the footing, if the floor slab does not provide lateral support at the wall base.

(6) Where foundation walls are laterally unsupported, the footing shall be designed according to Part 4 to resist overturning and sliding, if the maximum height of finished ground above the basement floor or crawl space ground cover exceeds 1.50 m.

(7) At the base of concrete block walls required to be reinforced and where the height of finished ground above the basement floor or crawl space ground cover exceeds 2.0 m, not less than one 15M intermediate vertical bar reinforcement shall be installed midway between adjacent continuous vertical reinforcement, and shall,

(a) extend to not less than 600 mm above the top of the footing, and

(b) have not less than 50 mm embedment into the footing, if the floor slab does not provide lateral support at the wall base.

(8) For concrete block walls required to be reinforced, a continuous horizontal bond beam containing at least one 15M bar shall be installed,

(a) along the top of the wall,

(b) at the sill and head of all openings greater than 1.20 m in width, and

(9) In concrete block walls required to be reinforced, all vertical bar reinforcement shall be installed along the centre line of the wall.

(10) In concrete block walls required to be reinforced, ladder or truss type lateral reinforcement not less than 3.8 mm (No. 9 ASWG) shall be installed in the bed joint of every second masonry course.

Editor's note

O. Reg. 137/07 creates a new version of this article effective 2007-04-02 but leaves Table 9.15.4.2.B. unchanged, so the e-Laws consolidation differences in the table described for the prior version carry forward to this version.

Text · e-Laws consolidated snapshot

Table 9.15.4.2.A. Thickness of Solid Concrete and Unreinforced Concrete Block Foundation Walls Forming Part of Sentence 9.15.4.2.(1)


Column 1	Column 2	Column 3	Column 4
Type of Foundation Wall	Minimum Wall Thickness, mm	Maximum Height of Finish Ground Above Basement Floor or Crawl Space Ground Cover, m
Type of Foundation Wall	Minimum Wall Thickness, mm	Foundation Wall Laterally Unsupported at the Top⁽¹⁾	Foundation Wall Laterally Supported at the Top⁽¹⁾
Solid concrete, 15 MPa min. strength	150	0.8	1.5
	200	1.2	2.15
	250	1.4	2.3
	300	1.5	2.3
Solid concrete, 20 MPa min. strength	150	0.8	1.8
	200	1.2	2.3
	250	1.4	2.3
	300	1.5	2.3
Unreinforced Concrete Block	140	0.6	0.8
	190	0.9	1.2
	240	1.2	1.8
	290	1.4	2.2

Note to Table 9.15.4.2.A.:

⁽¹⁾See Article 9.15.4.3.

Table 9.15.4.2.B. Reinforced Concrete Block Foundation Walls Forming Part of Sentence 9.15.4.2.(4)

Column 1	Colun 2	Column 3	Column 4	Column 5	Column 6
Minimum Wall Thickness, mm	Maximum Height of Finished Ground above Basement Floor or Crawl Space Ground Cover, m	Foundation Wall Laterally Unsupported at Top ⁽¹⁾		Foundation Wall Laterally Supported at Top ⁽¹⁾
		Continuous Vertical Reinforcement		Continuous Vertical Reinforcement
		Minimum Bar Size	Maximum Bar Spacing, m	Minimum Bar Size	Maximum Bar Spacing, m
190	1.0	25M	1.2	⁽²⁾	⁽²⁾
	1.2	25M	1.2	⁽²⁾	⁽²⁾
	1.4	25M	1.2	15M	1.2
	1.6	25M	0.8	15M	1.2
	1.8	25M	0.6	20M	1.2
	2.0	25M	0.4	20M	1.2
	2.2	⁽³⁾	⁽³⁾	25M	1.2
	2.4	⁽³⁾	⁽³⁾	25M	1.2
240	1.4	25M	1.0	⁽²⁾	⁽²⁾
	1.6	25M	1.0	⁽²⁾	⁽²⁾
	1.8	25M	0.8	⁽²⁾	⁽²⁾
	2.0	25M	0.8	20M	1.8
	2.2	25M	0.8	25M	1.8
	2.4	25M	0.6	25M	1.8

Notes to Table 9.15.4.2.B.:

⁽¹⁾See Article 9.15.4.3.

⁽²⁾No reinforcement required.

⁽³⁾Design to Part 4.

B 9.15.4.3. v0