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Unread 07-31-2015, 06:39 AM   #1
mark999
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contractor installed blue drywall in shower

Is blue board drywall (moisture resistant) acceptable as a substrate ? Stall floor will get deck mud with latticrete membrane and walls(blue board) will get hydroban applied with using a thickness gauge. Tile is honed limestone on a mesh sheet in a chevron design 1.3 sq. ft. per piece.

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Unread 07-31-2015, 07:21 AM   #2
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Apparently acceptable to your Contractor, Mark. Not likely acceptable to your local building code. Not acceptable to the waterproofing membrane manufacturer.
Quote:
Originally Posted by Mark
Stall floor will get deck mud with latticrete membrane and walls(blue board) will get hydroban...
Hydroban is a Laticrete membrane.
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Unread 07-31-2015, 08:37 AM   #3
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While drywall is an acceptable substrate for hydroban, there is an exception for wet areas where hydroban is to be installed only over ceement board.
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