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A cover block is basically a spacer that is used to lift the rebar matrix off the ground so that concrete may flow below the rebar. In order to prevent corrosion of the rebar, it has to be totally sheathed in concrete. It usually needs about 2 to 3 inches of coverage on all sides. So the cover block lifts the rebar up by about 2 to 3 inches and becomes a permanent and integral part of the poured concrete, make certain that no part of the rebar sags and minimizes that required concrete coverage throughout the pour.