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Unread 03-09-2006, 10:20 AM   #2
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Join Date: Nov 2003
Location: LaConner, Washington
Posts: 13,694
If you brought the vapor barrier down over the flange you'll still be OK. The wall tile can bridge a 1/2" gap easily. Matter of fact, you'll want to stop the tile 1/8" above the tub anyway so the gap becomes 3/8". I don't think you encounter problems grouting that small of an unbacked area. Fill the joint up good, it will stick.

You can always run a good ol bead of high grade silicon caulk in there along that flange for added insurance.

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