Foundation Footings for 8" high 12" block wall

Old 10-12-07, 01:15 PM
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Join Date: Aug 2004
Location: michigan
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Foundation Footings for 8" high 12" block wall

I'm looking for advice for how deep and how wide the footing for 12" concerte block wall 96" high would need to be to pass an inspection.

the project will consist of a 12'x20' room (outside of the existing basement) with a stairwell to the exterior.
The roof will be heavy gauge steel commercioal roof decking with a 4" concrete poured slab on it. Roofing tar applied, then commercial rubber roofing material with pea stone grave topping all.

ground conditions are hard, sandy clay, somewhat wet, but not too wet. I am thinking 16" wide x 12" deep footings. Anyone have a suggestion for the footing size?
I;m in michigan and the walls will be backfilled. Slab shall be exposed
Old 10-12-07, 02:20 PM
Join Date: Mar 2005
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Foundation Footings for 8" high 12" block wall

Traditionally, footing under block walls extend 4" beyond the block, so it would be 20" wide. Some code allow less.

Traditionally, the footing would be 8" thick. There is actually very little load on a footing, so thicker does little good. The heavier the building, the better.

Check you local code requirements.


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