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Unread 02-15-2020, 04:41 PM   #12
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 13,485
The manufacturer does not recommend the purple board for use in a shower...

While Aqua Defense can be used over drywall, it is not specified for use in a shower using drywall. It can be used over a cement board. You might want to call Mapei just for confirmation Phone: 1-888-US-MAPEI

So, it appears that the shower was not installed per industry or manufacturers' guidelines. IMHO, the installer doesn't have a leg to stand on.

People's time horizon is usually pretty short, and when looking at their new shower, they often only judge it based on how it looks on the outside, not that it failed after a bit of time. It's unfortunate, but a very large percentage of tiled showers are not built to industry guidelines. Now, not all of them fail, but far more than would had those guidelines been followed. While getting that looking nice is a skill set, if the 'bones' of the job aren't done right, it really doesn't matter unless it's sitting in a showroom, and never used.
Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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