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Unread 04-03-2010, 02:07 PM   #4
Houston Remodeler
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Join Date: Oct 2009
Location: Houston Texas
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As far as the square hole at the j trap - I would fill it with sand to about 3 inches of the top. Pack that down well, then cover that with cement. The idea is if you ever have to get at that drain you just break off the top layer and dig.

On the drain - as long as the drain flange sets about 1" over the slab you should be fine. That 1' allows you to fill in below the flange with greater ease.
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