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RE: Knock-out Panel

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Consider boxing it out like an opening. Use screw in rebar couplers with lapped splices. Provide a V joint in the interior perimeter of the wall to provide a positive shear key. Fill in the space with concrete "A" block, and grout all cells. The "A" block can be placed around the rebar. Use a rebar spacing that will work with CMU. The waterproofing should be a spray on coating applied from the outside. The fill behind the wall should be an open graded crushed rock to allow free draining to a perimeter drain.

Harold Sprague

From: "Rich Lewis" <seaint02(--nospam--at)>
Reply-To: <seaint(--nospam--at)>
To: <seaint(--nospam--at)>
Subject: Knock-out Panel
Date: Mon, 23 May 2005 09:21:58 -0500

I am designing a concrete basement wall that is to have a knock-out panel
for a future opening.  I would appreciate any suggestion on the best way to
detail this to ensure waterproofing and ease of demolition in the future.



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