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Unread 05-06-2021, 04:09 PM   #5
Veteran DIYer- Schluterville Graduate

STAR Senior Contributor

Join Date: Jul 2004
Location: Nashua, NH
Posts: 14,486
Some membranes designed for roofs and decks are designed for things like pavers or a floating wooden structure to sit on top of them.

If you make your platform stiff enough, you could use Ditra and then tile it. Use KerdiBand, or strips of Kerdi over the seams to waterproof it.

You could probably use Kerdiboard by itself if you then tiled over it as your platform, waterproofing, and tile substrate. Two layers of the 2" stuff, with a channel for your drain pipe wouldn't have any deflection issues once you tiled it and things had cured. They use that type of foam on bridge ramps instead of compacting stone and gravel...spread the point load out with a suitable tile, and it's robust.
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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