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Unread 11-29-2011, 08:24 PM   #9
builder, anti-builder, rebuilder -- Retired Moderator
Join Date: Mar 2009
Location: oahu
Posts: 13,164
If the flange is properly glued to the riser, what Paul & Nate said. You can also add a 2x block(s) under the P-trap or horizontal run for support.

Oh, and the height of the bottom of the flange, should be at the height of the top of the finished floor (tile). So, the flange should rest on the finished floor or something that is as high as the finished floor, like a chunk of plywood or backer board.

"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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