What is a "block out" in concrete, and why do we need to check them before pouring?

A block-out is a temporary wood or foam frame placed into concrete deck forms to create an open hole for future vertical duct risers. You must check them to ensure they align perfectly with your blueprint layout before the concrete is poured.

['A block-out is a temporary wood or foam frame placed into concrete deck forms to create an open hole for future vertical duct risers. You must check them to ensure they align perfectly with your blueprint layout before the concrete is poured.']

Stop if

• Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.

Steps

• A block-out is a temporary wood or foam frame placed into concrete deck forms to create an open hole for future vertical duct risers. You must check them to ensure they align perfectly...

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