Tempo:
Column Footings Locate footings for posts or columns (Figures 32 and 33) so that the members they will support are centred. Footings vary in size depending on the allowable soil pressure and the load they support. On average stable soil, common sizes are 0.4 m2 (4.3 sq. ft.)—about 640 × 640 mm (25 × 25 in.)—for one-storey houses and 0.75 m2 (8 sq. ft.)—870 × 870 mm (34 × 34 in.)—for two-storey houses. The thickness of column footings without reinforcement must be at
least 100 mm (4 in.) and must never be less than the column footing’s projection measured from the edge of the column base plate to the edge of the footing. Footings for fireplaces and chimneys are usually placed at the same time as other footings. Fabric form footings are an innovative way to cast and form concrete footings using non-woven polypropylene, woven polyethylene or other similar materials, with the fabric supplied in a bag format to form pads for columns or a continuous
32 Steel column supported on steel bearing plate resting on footings steel column concrete floor
layer of sheathing membrane or polyethylene around steel column to break bond of concrete to slab
dampproofing granular fill steel bearing plate grout to level bearing plate thickness projection concrete footing
The thickness of the footing must not be less than the projection and never less than 100 mm (4 in.).
33 Wood column supported on concrete footings wood column concrete floor dampproofing granular fill layer of polyethylene around wood column thickness projection concrete footing
least 100 mm (4 in.) and must never be less than the column footing’s projection measured from the edge of the column base plate to the edge of the footing. Footings for fireplaces and chimneys are usually placed at the same time as other footings. Fabric form footings are an innovative way to cast and form concrete footings using non-woven polypropylene, woven polyethylene or other similar materials, with the fabric supplied in a bag format to form pads for columns or a continuous
32 Steel column supported on steel bearing plate resting on footings steel column concrete floor
layer of sheathing membrane or polyethylene around steel column to break bond of concrete to slab
dampproofing granular fill steel bearing plate grout to level bearing plate thickness projection concrete footing
The thickness of the footing must not be less than the projection and never less than 100 mm (4 in.).
33 Wood column supported on concrete footings wood column concrete floor dampproofing granular fill layer of polyethylene around wood column thickness projection concrete footing
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