A cover block is essentially a spacer that is used to lift the rebar matrix off the ground so that concrete may flow underneath the rebar. In order to prevent corrosion of the rebar, it needs to be fully encased in concrete. By code, it usually needs about (25-75 mm) and becomes a permanent and integral part of the poured concrete, ensuring that no part of the rebar sags and minimized that required concrete coverage during the pour
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