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Posted by marson on April 10, 2008, 8:12 pm
> First of all lets start with the height. 3 blocks ie
> 24" down isn't deep enough for a freeze thaw area.
>
>
>
> > Hello, I will build a concrete block wall 4 blocks
> > high for a garage. Three of the courses will be
> > below grade. I want to make this wall as strong as
> > practically possible. (I could not use a poured wall
> > because of access problems). I live in a freeze/thaw
> > area. I want to use some rebar in the cores for
> > strength. Should these cores with rebar be filled
> > with concrete or mortar? Also anything I can do to
> > prevent cracking from the freeze/thaw cycles? Would
> > a control joint on each wall make sense? Thanks,
> > paul
Not sure what you are trying to accomplish. What do you mean by
"freeze thaw"? Obviously, you need to be below the frost depth in
your area or no amount of rebar will save you.
If you are concerned about lateral force, then core fill with
concrete. A bond beam would help, though it's hard to see why it
would be necessary on three courses. I assume you are filling the
center and prepping for a slab---in that case the slab and fill would
prevent the wall from pushing in.
No need for control joints.
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