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Old 01-02-2018, 04:01 PM   #2
Houston Remodeler
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Join Date: Oct 2009
Location: Houston Texas
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Welcome to the forum.

With a hot mop as the waterproofing, it would be my guess the drain height is higher in elevation than the hot mop layer. The drain shown has no weep holes. This combined with the hot mop elevation means the mud bed / drypack (above the hot mop and below the tile) is holding water. This should not be a problem as long as the shower and main bath floor are properly waterproofed. It would have been wiser to use a surface applied membrane as the waterproofing. A surface applied membrane would have eliminated the thick drypack layer and the need for weep holes.

Surface applied membranes are Kerdi, Hydroban, Aqua Defence, Nobleseal, Red Guard and a few more.

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Houston TX area Kitchen & Bath Remodeling
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