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Where in the Ontario Building Code does it say when a floating slab needs engineered stamped drawings?

April 26, 2017building code drawings engineered floating Needs ontario slab stamped

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Where in the Ontario Building Code does it say when a floating slab needs engineered stamped drawings?

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OBC Table 9.12.2.2 shows the minimum depths of foundations (which shows depth of foundation to below frost, ie 3′-11″) But OBC 9.12.2.2 (6) (b) (iii) states these depths don’t apply for buildings “not more than 55 m^2 (538 ft^2) in building area”.