Assemble forms: Join 2×6 or 2×8 lumber to form ... Concrete cures much quicker during hot weather too quick sometimes; ...

Wall and column forms are often placed on previously hardened concrete slabs that are not perfectly flat. Thus there are some gaps under the forms, and leakage will occur at these locations.

When control joints meet curving form lines the joint should meet ... frost heaving due to lack of water drainage under slabs, the resulting concrete stresses can cause cracks.