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Re: Knock-out Panel

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Rich Lewis wrote:

I don’t think precast panels would be practical.  This is a below grade foundation wall that needs a future opening into the basement area.  The remaining structure is all cast in place.

.

Place the concrete with the opening boxed out. Make the fill side opening 4" larger than the basement side, with a "step" about half way in.  Make a second placement for the knockout, placing a bentonite water stop around the perimeter of the opening.  If the opening is large enough, you may need to reinforce the knockout and/or thicken the wall around the knockout area in order to get the shear resistance at the "step" in the wall, where the effective wall thickness is only 1/2).

(Did that make sense?)

Jordan
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