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Old 01-22-2018, 11:39 AM   #1
Philip Parker
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OSB subfloor prep for TileRedi

Howdy -

I work in the construction world but I am not a tile setter. I recently built a house for my family and I am in the process of finishing the master bath.

We received a free curbless TileRedi shower pan that I'll be installing over regular 3/4 inch OSB subfloor. I have zero interest in repairing or working on the house for the next 10 years so my tendency has been to build with this intention and work with materials that offer zero to little maintenance. I would love for this shower pan to be the same.

My initial plan was to RedGard the OSB as a precautionary membrane to avoid moisture intrusion and lay the grout bed over the RedGard, but I have two concerns:

1. Will the RedGard bond to the OSB well enough to offer a stable bond to the shower pan, and

2. Will this create a dual membrane situation that will actually trap water, or can I assume that if there is any moisture under the pan over the years that it will dissipate through the other, untreated side of the sub floor.

Many thanks for your advice in advance!

Philip
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Old 01-23-2018, 10:09 AM   #2
John Bridge
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Hi Philip,

Forget the RedGard on the OSB. That won't gain you anything. It will bond to it, though.

It's more important to concentrate on making the shower itself waterproof.
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Old 01-24-2018, 06:07 AM   #3
tilemanct
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Scrap the Tile Ready base and just go out and get a high quality acrylic base if you are looking for a 10 year maintenance free product. There was a reason someone just gave it to you!!
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Old 01-31-2018, 10:31 AM   #4
Philip Parker
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Dave - Can you elaborate more? I've certainly heard mixed reviews on the TileRedi pans, but without any first hand experience installing them I have no idea how well they go in.
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Old 01-31-2018, 10:35 AM   #5
Philip Parker
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Thanks John! Two walls on this shower are exterior walls with 4mil plastic installed as a vapor barrier. I've furred out the wall where the supply lines and shower controls/heads will be fitted. I've heard doing a double plastic barrier is a bad idea (in that it can trap moisture where the framing is) and that allowing one side of the shower to breath out is a good thing. Any thoughts about that?

Philip
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Old 01-31-2018, 10:44 AM   #6
John Bridge
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Hi Philip,

I'm going to move this into the Advice Forum. Maybe we'll get more response there.
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