Tempo:
Table 4 Minimum footing sizes (Length of supported joists 4.9 m [16 ft.] or less) (Design floor load 2.4 kN/m2 [50 lb./ft.2] maximum) Minimum Widths of Strip Footings, mm (in.) No. of Floors Supported
Supporting Exterior Walls
Supporting Interior Walls
Minimum Area of Column Footings1, m2 (sq. ft.)
1
250 (10)2
200 (8)3
0.4 (4.3)
2
350 (14)2
350 (14)3
0.75 (8)
3
450 (18)2
500 (20)3
1.0 (11)
Notes to Table 4 1. Sizes are based on columns spaced 3 m (9 ft., 10 in.) (on centre). For other column spacings, footing areas must be adjusted in proportion to the distance between columns. 2. For each storey of masonry veneer over wood-frame construction, footing widths must be increased by 65 mm (21⁄2 in.). For each storey of masonry construction other than foundation walls, the footing width must be increased by 130 mm (51⁄8 in.). 3. For each storey of masonry supported by the footing, the footing width must be increased by 100 mm (4 in.).
Table 5 Minimum thickness of foundation walls Maximum Height of Exterior Finish Grade Above Basement Floor or Inside Grade, m (ft.–in.) Type of Foundation Wall
Minimum Wall Thickness, mm (in.)
Foundation Wall Laterally Unsupported at the Top1 to 4
Foundation Wall Laterally Supported at the Top1 to 4
Solid concrete, 15 MPa (2,200 psi) minimum strength
150 (6)
0.80 (2–7)
1.50 (4–11)
200 (8)
1.20 (3–11)
2.15 (7–0)
250 (10)
1.40 (4–7)
2.30 (7–6)
300 (12)
1.50 (4–11)
2.30 (7–6)
150 (6)
0.80 (2–7)
1.80 (5–10)
200 (8)
1.20 (3–11)
2.30 (7–6)
250 (10)
1.40 (4–7)
2.30 (7–6)
300 (12)
1.50 (4–11)
2.30 (7–6)
140 (51⁄2)
0.60 (1–11)
0.80 (2–7)
240 (97⁄16)
1.20 (3–11)
1.80 (5–10)
290 (117⁄16)
1.40 (4–7)
2.20 (7–2)
Solid concrete, 20 MPa (2,900 psi) minimum strength
Unit masonry
Notes to Table 5 1. Foundation walls are considered laterally supported at the top if the floor joists are embedded in the top of the foundation walls, or if the floor system is anchored to the top of the foundation walls with anchor bolts, in which case the joists may run either parallel or perpendicular to the foundation wall. 2. When a foundation wall contains an opening of more than 1.2 m (3 ft.–11 in.) in length or openings in more than 25 per cent of its length, the portion of the wall beneath such openings is considered laterally unsupported unless the wall around the opening is reinforced to withstand the earth pressure. 3. When the length of solid wall between windows is less than the average length of the windows, the combined length of such windows is considered a single opening. 4. When foundation walls support solid masonry walls, the foundation wall is considered laterally supported by the first floor.
Supporting Exterior Walls
Supporting Interior Walls
Minimum Area of Column Footings1, m2 (sq. ft.)
1
250 (10)2
200 (8)3
0.4 (4.3)
2
350 (14)2
350 (14)3
0.75 (8)
3
450 (18)2
500 (20)3
1.0 (11)
Notes to Table 4 1. Sizes are based on columns spaced 3 m (9 ft., 10 in.) (on centre). For other column spacings, footing areas must be adjusted in proportion to the distance between columns. 2. For each storey of masonry veneer over wood-frame construction, footing widths must be increased by 65 mm (21⁄2 in.). For each storey of masonry construction other than foundation walls, the footing width must be increased by 130 mm (51⁄8 in.). 3. For each storey of masonry supported by the footing, the footing width must be increased by 100 mm (4 in.).
Table 5 Minimum thickness of foundation walls Maximum Height of Exterior Finish Grade Above Basement Floor or Inside Grade, m (ft.–in.) Type of Foundation Wall
Minimum Wall Thickness, mm (in.)
Foundation Wall Laterally Unsupported at the Top1 to 4
Foundation Wall Laterally Supported at the Top1 to 4
Solid concrete, 15 MPa (2,200 psi) minimum strength
150 (6)
0.80 (2–7)
1.50 (4–11)
200 (8)
1.20 (3–11)
2.15 (7–0)
250 (10)
1.40 (4–7)
2.30 (7–6)
300 (12)
1.50 (4–11)
2.30 (7–6)
150 (6)
0.80 (2–7)
1.80 (5–10)
200 (8)
1.20 (3–11)
2.30 (7–6)
250 (10)
1.40 (4–7)
2.30 (7–6)
300 (12)
1.50 (4–11)
2.30 (7–6)
140 (51⁄2)
0.60 (1–11)
0.80 (2–7)
240 (97⁄16)
1.20 (3–11)
1.80 (5–10)
290 (117⁄16)
1.40 (4–7)
2.20 (7–2)
Solid concrete, 20 MPa (2,900 psi) minimum strength
Unit masonry
Notes to Table 5 1. Foundation walls are considered laterally supported at the top if the floor joists are embedded in the top of the foundation walls, or if the floor system is anchored to the top of the foundation walls with anchor bolts, in which case the joists may run either parallel or perpendicular to the foundation wall. 2. When a foundation wall contains an opening of more than 1.2 m (3 ft.–11 in.) in length or openings in more than 25 per cent of its length, the portion of the wall beneath such openings is considered laterally unsupported unless the wall around the opening is reinforced to withstand the earth pressure. 3. When the length of solid wall between windows is less than the average length of the windows, the combined length of such windows is considered a single opening. 4. When foundation walls support solid masonry walls, the foundation wall is considered laterally supported by the first floor.
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