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Posted by RicodJour on April 9, 2008, 11:19 pm
wrote:
>
> >>> Ok, here comes the stupid footer question of the month. I've been
> >>> researching info on constructing a garage and know that I have to have a
> >>> footer below the frost line, which in my neck of the woods is 32 inches,
> >>> my
> >>> question is exactly WHAT has to be below that line. Does the entire
> >>> footer
> >>> need to be below as in a 8 inch thick footer has the top of the footer
> >>> at
> >>> 32 inches or does the footer just have to sit or have its bottom at the
> >>> frost line.
>
> >>> I originally thought it was the first way but have since seen some
> >>> inferences that it might be the second way. I want to do this correctly
> >>> but
> >>> if I can start the footer 8 inches higher I save on hand digging 16 x 8
> >>> inches of dirt and save on 8 x 8 inches of concrete for the stem wall
> >>> thus
> >>> lightening the load on my wallet and back.
>
> >> Top of the footing.
>
> > Around here it is a 48" frost line and to the BOTTOM of the footing. Why
> > the top? What if the footing is 2' thick?
>
> I always thought the same though we never have to deal with frost lines
> where we build so I don't know. The way I understand is that SOMETHING has
> to sit on solid ground that won't shift to much, so if the bottom is below
> the frost line, the rest "should" stay relatively put. That's all pure
> assumption though, so take it with a grain of salt.
>
> Basically here in California the frost line is above where a standard
> footing would be anyways, so we build em like normal. This makes me think
> that it's the bottom that must sit below the frost line.
The frost line is an imaginary line and, hopefully, not the actual
depth of frost - otherwise you're in trouble. The frost line is a
design criteria and the footing should sit on undisturbed soil no less
than the stated depth.
R
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