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Shower Waterproofing

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FX drain on heated tile

This is the shower floor chapter of the bargain basement budget emergency bath build (Not in a basement)


We have a 36 by 48 neo angle shower on a slab foundation.


Due to cast iron surgery and concrete demo we managed to end up with a recessed shower area to use for a curbless shower.


The tiny bathroom floor will be slab -> synthetic cork -> Prolux membrane with floor heat wires (think K-mart version of Ditra Heat) then ceramic tiles, obviously with thinset in between each layer.


The shower layers are the same except a dry-pack on the recessed slab ramping down from floor level to drain and No Flo membrane before the tile layer.

Should flange be on cork or on the heating membrane?
Should flange be on cork or on the heating membrane?

My dilema is what to bond the flange to. My gut tells me to bond it to the cork layer and let the heat membrane dead end into the flange and try and keep top of heat membrane at the same hight as the top of the flange. Then the no flo membrane goes right over the top of both of them.


I also need to get my act together and place my Tile Coach order so I have all of these items in hand instead of relying on published dimensions. (Isaac - selling the membrane by the foot should qualify you for a nobel prize)


My other big issue is the drypack. All my local dry pack options are unknowns or known to be bad. It looks like I get a 45 minute drive to buy Mapei 4-1 at my Lowes for 3 times what Lowes sells it for in some of their other stores. $30 a bag verses $10.


Thanks in advance

Jim


Does anybody else think I should NOT use the CeraZorb synthetic cork between the shower dry pack and the heat membrane?

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slojim
Oct 31, 2025

Slow progress, but progress it is.

Deep breath.. high tech screeds ready

Almost for got to Glue in the drain since it had been dry fitted so long ago

Hard to stop fussing with it at the end

I'll give it B since I had a few dips around the drain flange to even out.

Now here comes synth cork

The heat membrane made it in next but no pictures yet. It became the storage closet after a few days of drying. I will be putting in the heat wires in a day or so and then the scary part. The waterproofing.

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