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Old 06-06-2013, 06:49 PM   #1
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Set shower base in mud


I am going to be installing a pre-formed shower base in a bathroom remodel, I am removing a tub, and placing in a shower. The base I am using is here:

I was going to set the base in a layer of structolite to help level it, and give it full support throughout. My question is with regards to the structolite and bottom of the shower base. The underside of the base has a foam board bottom, covering the whole base. One of the reviews of the product on the HD site says "Great rigid foam base makes it easy to set and is firm with no bounce."

1. If I place the base directly in the structolite, will the structolite degrade the foam board in anyway (basically its like a stiff Styrofoam)?
2. Could I place a plastic sheet between the structolite and bottom of base, so this would not even be an issue?
3. Do I also need a plastic sheet between the wood sub-floor and the structolite, to keep the wood from soaking up water from the structolite?

Thanks in advance,


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Old 06-06-2013, 07:14 PM   #2
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You will need to call the maker to see if the foam can tolerate the mortar.

Isolating it from the foam with plastic may be all that is required--
If that is a flat bottomed foam pan--you will need very little mortar ---you might wish to use a 3/8 " tile trowel to get an even bed---


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Old 06-06-2013, 07:27 PM   #3
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I'm not a fan of showers or tubs with foam on the bottom, but that's just me I guess
I hear complaints of movement and squeeking.

Not sure what structolite is either, but it has been suggested here before to set the foam base on construction adhesive and glue it to the floor. This may or may not work for you- depends on how out of level you are.
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