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Old 01-25-2010, 01:16 PM   #1
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Footings for 16" sq concrete support posts

We want to construct a 12x20 shed here in the Bahamas but cannot find code for footings for 16" sq support posts. Walls are T-111 and open above 4'. No electric, no water. Up north they should be 20x20x8. Without having to go below a freeze line at what depth should the footings be and what size square?
Any help is appreciated and thanks.
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Old 01-25-2010, 02:13 PM   #2
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Up north even where there is no frost, it is common to have the bottom of the footing of the 12" below grade and have it on firm soil. For an 8" thick footing many people have the slab 4" (1/2 of the thickness) beyond the edge of the column , wall or pier.

Since you have 16x16 columns you must have high loads or few columns. I would think your biggest problem is holding the shed down with good anchorage and keep it from flying into a house during one of your storms/hurricanes considering the height of the piers and shed.

Last edited by concretemasonry; 01-25-2010 at 07:55 PM.
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