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Sonny Sonny is offline
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Default How necessary is gravel under concrete?

I would recommend putting a 1'X1' footing adjacent to your garage slab
and one at the end of your new slab, also. Put an expansion joint at
the center of your pour by placing a physical divider there. Just
cutting a kerf in the concrete (after it sets up well?) is not a
proper expansion joint and may likely not work to prevent the slab
from cracking somewhere else.

Order 3000psi concrete. Costs the same as 2500 psi.