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OBC 2006 › Division B

9.15.3.4.

Version 0 — in force 31 December 2006

In force
Verified · covered Verified against the 2006-12-31–2007-04-01 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · split from 9.15.3.3. — Pro

OBC 1997 · continues from 9.15.3.4. — Pro

Base · O. Reg. 350/06 · ext← current

Original — base regulation

O. Reg. 503/09, cl. 158 · ext v1 →

In force 2010-01-01

Next: O. Reg. 503/09, cl. 158 · ext (not in force until 2010-01-01) v1 →

OBC 2012 · continues as 9.15.3.4. — Pro

9.15.3.4. — Basic Footing Widths and Areas

Comparing versions

Changed text stands out · unchanged is dimmed

v0 base

Earlier · viewing · 2006-12-31

(1) Except as provided in Sentences (2) and (3) and in Articles 9.15.3.5. to 9.15.3.7., the minimum footing width or area shall comply with Table 9.15.3.4.

(2) Where the supported joist span exceeds 4.9 m in buildings with light wood-framed walls, floors and roofs, footing widths shall be determined according to,

(a) Section 4.2., or

(b) the following formula:

W = w • [∑ sjs / (storeys • 4.9)]

where,

W = minimum footing width,

w = minimum width of footings supporting joists not exceeding 4.9 m, as defined by Table 9.15.3.4.,

∑ sjs = the sum of the supported joist lengths on each storey whose load is transferred to the footing, and

storeys = number of storeys supported by the footing

(3) Where a foundation rests on gravel, sand or silt in which the water table level is less than the width of the footings below the bearing surface,

(a) the footing width for walls shall be not less than twice the width required by Sentences (1) and (2), and Articles 9.15.3.5. and 9.15.3.6., and

(b) the footing area for columns shall be not less than twice the area required by Sentences (1) and (2), and Article 9.15.3.7.

v1 O. Reg. 503/09

Later · 2010-01-01

(1) Except as provided in Sentences (2) and (3) and in Articles 9.15.3.5. to 9.15.3.7., the minimum footing width or area shall comply with Table 9.15.3.4.

(2) Where the supported joist span exceeds 4.9 m in buildings with light wood-framed walls, floors and roofs, footing widths shall be determined according to,

(a) Section 4.2., or

(b) the following formula:

W = w • [∑ sjs / (storeys • 4.9)]

where,

W = minimum footing width,

w = minimum width of footings supporting joists not exceeding 4.9 m, as defined by Table 9.15.3.4.,

∑ sjs = the sum of the supported joist spans on each storey whose load is transferred to the footing, and

storeys = number of storeys supported by the footing

(3) Where a foundation rests on gravel, sand or silt in which the water table level is less than the width of the footings below the bearing surface,

(a) the footing width for walls shall be not less than twice the width required by Sentences (1) and (2), and Articles 9.15.3.5. and 9.15.3.6., and

(b) the footing area for columns shall be not less than twice the area required by Sentences (1) and (2), and Article 9.15.3.7.