Thread: Mud shower pan
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Unread 07-18-2019, 05:49 AM   #48
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Join Date: Jul 2005
Location: Fairfax, Va
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Clamps on the just don't want to penetrate the water proofing layer. What most here seem to do, and have success with, is drilling a hole into the tile without getting into the water proofing. Cut the attaching screws at the same length as the hole is deep, squeeze epoxy into the hole and cover the bottom of the clamp with epoxy, then set the clamp and screw into it. Clean the area, wait for epoxy to set.

If your tile is 3/8" and you allow for 1/8" of mortar, a 1/2" deep hole will ensure you don't poke a hole in the WP. Cut the screw a 1/2" and the thickness of the clamp will ensure the screw doesn't bottom out in the hole.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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