Forms
The material most commonly used for edge forms is 2 by lumber. The lumber must occasionally be replaced, but the steel or aluminum angles and charnels may be reused many times. The tops of the forms must be in the same plane so that they may be used for screeds. They must also be well braced to remain in good alignment.
Edge forms should have holes in them for rebar or for expansion/contraction dowels to protrude. These holes should be ΒΌ inch larger in diameter than the bars. At times, the forms are spliced at the line of these bars to make removal easier.
The forms, or rough bucks, for doors, windows, air conditioning ducts, and so forth are set before the steel is placed and should be on the same plane as the edge forms.