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

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

(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.

Editor's note

In the notes to Table-9.15.3.4., the footnote reference numbers are presented inline with a separating space; the e-Laws consolidation renders them as superscript abutting the text. The footnote text is identical.

Text · e-Laws consolidated snapshot

Table 9.15.3.4. Minimum Footing Sizes Forming Part of Sentence 9.15.3.4.(1)


Column 1	Column 2	Column 3		Column 4
Number of Floors Supported	Minimum Width of Strip Footings, mm			Minimum Footing Area for Columns Spaced 3 m o.c.⁽¹⁾, m²
	Supporting Exterior Walls⁽²⁾		Supporting Interior Walls⁽³⁾
1	250		200	0.40
2	350		350	0.75
3	450		500	1.0

Notes to Table 9.15.3.4.:

⁽¹⁾See Sentence 9.15.3.7.(1).

⁽²⁾See Sentences 9.15.3.5.(1).

⁽³⁾See Sentence 9.15.3.6.(1).