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Unread 10-07-2019, 09:09 PM   #1
po1973
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Concrete on redgard?

Any feeling on putting a concrete slab on top of a red guard shower pan? I'm building a sauna in a shed and would like to use a liquid membrane redguard and rather than tile the final surface just leave it as concrete as I will put cedar strip boards on top of the floor surface. So it's not necessary to have a tiled surface. Could I pour a concrete slab in place of a second deck pan with tile on top.

Thanks.
Pat in Minnesota
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Unread 10-07-2019, 10:03 PM   #2
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Welcome back, Pat.

So you have Redgard properly tied to the drain, and you want to use concrete on top of that, followed by cedar strips, correct?

The only possible issue I can think of is that water doesn't pass through concrete very quickly. If it's covered, it may retain moisture a while.

How would the strips be fit to the slope of the concrete?
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Unread 10-07-2019, 11:26 PM   #3
po1973
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thanks!

been a while. several bathrooms done since i've last logged in but this a new "outdoor" project.

the cedar boards would be a "duck board layout" set on concrete as this is outdoors, wood fire heat only. this sauna hot room is 6x8.
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Unread 10-08-2019, 12:32 AM   #4
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For an outdoor sauna, I would recommend calling Custom Technical support at 800-272-8786 to get their blessing.

Someone else here might know for sure if you can use Redgard for that application.
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Unread 10-08-2019, 06:27 AM   #5
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sounds like if it leaks it doesn't matter.?
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Unread 10-08-2019, 06:39 AM   #6
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If it's inside the shed then I'd build it as if it's inside a house. Like Kevin, I wonder how you have the Redgard tied into the drain and are you using a 3 pc clamping drain? Maybe the divot method.
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Unread 10-08-2019, 06:51 AM   #7
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if he is putting a mortar bed over it dose he need the divot?,going in like a PVC liner..
What is going on the walls? When you say shed is it a plywood floor or slab?
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Unread 10-08-2019, 06:58 AM   #8
po1973
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this sauna with shower is INSIDE a shed in my backyard. floor drain. the shed is off ground about a foot. will freeze but water will be tossed on the woodstove and need a place to drain.

i'll give the custom folks a call a little later.

thanks for the feedback!
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Unread 10-09-2019, 03:56 PM   #9
po1973
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Just spoke with Custom rep in California. He said that the concrete will not bond to the redgard and that will be a problem. SO....looks like i'm back to preslope, redgard membrane, mortar bed, tile. Just need to find some tile that I can live with at a reasonable price!
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Unread 10-09-2019, 04:12 PM   #10
po1973
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or the oatey rubber membrane....?
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Unread 10-09-2019, 04:55 PM   #11
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"Floor drain" doesn't tell me much. Is it a 3 pc clamping drain made for a shower? I'd put down a preslope then use the 3 pc clamping drain and Oatey pan liner instead of the Redgard. Then use deck mud like is usually done. Then tile on top of the mud. The mud bed won't bond to the liner, doesn't need to. If you can, post a pic of the drain.
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Unread 10-09-2019, 05:38 PM   #12
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Think I would pass on the Oatey Pat. CPE would be a better choice than PVC. It ages nicer under brutal conditions.
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