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, concrete core in flat wall insulating concrete forms or solid concrete and subject to lateral earth pressure shall conform to Table 9.15.4.2.-A for walls not exceeding 3.0 m in unsupported height. (2) The concrete core in flat insulating concrete form foundation walls shall be not less than the greater of (a) 150 mm, or (b) the thickness of the concrete in the wall above. (2.1) Foundation walls made of flat insulating concrete form units shall be laterally supported at the top and at the bottom. (3) 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 (4) to (7), where (a) the walls are laterally supported at the top, (b) average stable soils are encountered, and (c) wind loads on the exposed portion of the foundation are no greater than 0.70 kPa. (4) 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, and (c) 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. (5) For concrete block walls required to be reinforced, a continuous horizontal bond beam containing not less than 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 (c) at structurally connected floors. (6) In concrete block walls required to be reinforced, all vertical bar reinforcement shall be installed along the centre line of the wall. (7) In concrete block walls required to be reinforced, ladder- or truss-type lateral reinforcement not less than 3.8 mm in diameter (No. 9 ASWG) shall be installed in the bed joint of every second masonry course. Table 9.15.4.2.-A Thickness of Solid Concrete, Concrete Core in Flat Wall Insulating Concrete Form and Unreinforced Concrete Block Foundation Walls Forming Part of Sentence 9.15.4.2.(1) Maximum Height of Finish Ground Above Basement Floor or Crawl Space Ground Cover, m Height of Foundation Minimum Thickness Type of Foundation Wall Laterally of Concrete or Height of Foundation Wall Laterally Supported at the Top(1)(2) Wall Unsupported at the Concrete Block, mm Top(1)(2) > 2.5 m and > 2.75 m and  3.0 m  2.5 m  2.75 m  3.0 m Solid concrete and 150 0.8 1.5 1.5 1.4 concrete core in flat 200 1.2 2.15 2.15 2.1 wall insulating 250 1.4 2.3 2.6 2.5 concrete forms,(3) 15 MPa min. strength 300 1.5 2.3 2.6 2.85 Solid concrete and 150 0.8 1.8 1.6 1.6 concrete core in flat 200 1.2 2.3 2.3 2.2 wall insulating 250 1.4 2.3 2.6 2.85 concrete forms,(3) 20 MPa min. strength 300 1.5 2.3 2.6 2.85 140 0.6 0.8 — — Unreinforced 190 0.9 1.2 (4) (4) concrete block 240 1.2 1.8 (4) (4) 290 1.4 2.2 — — Notes to Table 9.15.4.2.-A: (1) See Article 9.15.4.3. (2) See Article 9.15.4.6. (3) See Note A-Table 9.15.4.2.-A. (4) See Table 9.15.4.2.-B. Table 9.15.4.2.-B Reinforced Concrete Block Foundation Walls Laterally Supported at the Top (1) Forming Part of Sentence 9.15.4.2.(3) Maximum Height of Size and Spacing of Continuous Vertical Reinforcement, M at mm o.c. Finished Ground 190 mm Minimum Wall Thickness 240 mm Minimum Wall Thickness Above Basement Floor or Crawl Space Foundation Wall Height Foundation Wall Height Ground Cover, m(2)  2.5 m  2.75 m  3.0 m  2.5 m  2.75 m  3.0 m 0.8 (3) (3) (3) (3) (3) (3) 1.0 (3) 1-15M at 1 800 1-15M at 1 800 (3) (3) (3) 1.2 (3) 1-15M at 1 600 1-15M at 1 600 (3) 1-20M at 2 000 1-20M at 2 000 1.4 1-15M at 1 600 1-15M at 1 600 1-15M at 1 600 (3) 1-20M at 1 800 1-20M at 1 800 1.6 1-15M at 1 400 1-15M at 1 400 1-15M at 1 400 (3) 1-20M at 1 600 1-20M at 1 600 1.8 1-15M at 1 400 1-15M at 1 400 1-15M at 1 200 (3) 1-20M at 1 600 1-20M at 1 600 1-15M at 1 000 2.0 1-15M at 1 200 or 2-15M at 1 200 1-20M at 1 600 1-20M at 1 600 1-20M at 1 600 1-20M at 1 200 2.2 2-15M at 1 200 2-15M at 1 000 2-15M at 1 000 1-20M at 1 400 1-20M at 1 400 1-20M at 1 400 2.4 2-15M at 1 000 2-15M at 1 000 2-15M at 800 1-20M at 1 400 1-20M at 1 400 1-20M at 1 200 2-15M at 800 2-15M at 800 2.6 n/a or or n/a 1-20M at 1 000 1-20M at 1 000 1-25M at 1 000 1-25M at 1 000 1-20M at 800 2.8 n/a n/a 1-20M at 600 n/a n/a or 2-15M at 1 000 1-20M at 400 3.0 n/a n/a or n/a n/a 2-15M at 800 1-25M at 600 Notes to Table 9.15.4.2.-B: (1) See Article 9.15.4.3. (2) See Article 9.15.4.6. (3) No reinforcement required.