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Old 11-16-2018, 12:00 PM   #1
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setting sleepers without breaking concrete moisture seal


Hello! What is the technique to set sleepers to a concrete slab foundation without breaking the moisture barrier seal, whether it be a plastic sheet or liquid sealant?
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Old 11-16-2018, 12:16 PM   #2
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Re: setting sleepers without breaking concrete moisture seal


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Originally Posted by tambourinecactu View Post
Hello! What is the technique to set sleepers to a concrete slab foundation without breaking the moisture barrier seal, whether it be a plastic sheet or liquid sealant?
Are you worried about moisture coming up of going into the concrete?
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Old 11-16-2018, 12:17 PM   #3
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Re: setting sleepers without breaking concrete moisture seal


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Are you worried about moisture coming up of going into the concrete?
maybe both? but mostly coming up and condensating then rotting the wood
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Old 11-16-2018, 12:22 PM   #4
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Re: setting sleepers without breaking concrete moisture seal


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maybe both? but mostly coming up and condensating then rotting the wood
Wood should not touch concrete directly, Use a sill gasket and nail them down, screw them down or let them float.
http://www.google.com/shopping/produ...hoCXkAQAvD_BwE
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Old 11-16-2018, 12:30 PM   #5
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Re: setting sleepers without breaking concrete moisture seal


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Originally Posted by Nealtw View Post
Wood should not touch concrete directly, Use a sill gasket and nail them down, screw them down or let them float.
http://www.google.com/shopping/produ...hoCXkAQAvD_BwE
Ok! I was thinking if it was possible to have them floating too...is there some other step, or just lay the sleepers down on some plastic or battens?
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Old 11-16-2018, 01:05 PM   #6
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Re: setting sleepers without breaking concrete moisture seal


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Originally Posted by tambourinecactu View Post
Ok! I was thinking if it was possible to have them floating too...is there some other step, or just lay the sleepers down on some plastic or battens?
Just staple sill gasket to the bottoms of the sleepers. I would put 1 1/2" foam board between them.
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Old 11-16-2018, 01:43 PM   #7
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Re: setting sleepers without breaking concrete moisture seal


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Just staple sill gasket to the bottoms of the sleepers. I would put 1 1/2" foam board between them.
will that be ok with wet underfloor heating in the concrete below?
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Old 11-16-2018, 01:48 PM   #8
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Re: setting sleepers without breaking concrete moisture seal


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will that be ok with wet underfloor heating in the concrete below?
Well then no, I was thinking you had a cold floor, you don't usually worry about moisture with a heated floor, there should sealed foam below the concrete.
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Old 11-16-2018, 01:49 PM   #9
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Re: setting sleepers without breaking concrete moisture seal


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Well then no, I was thinking you had a cold floor, you don't usually worry about moisture with a heated floor, there should sealed foam below the concrete.
ah ok, great!
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Old 11-16-2018, 02:10 PM   #10
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Re: setting sleepers without breaking concrete moisture seal


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ah ok, great!
There is a test you can do. Find a tape that will stick to concrete and tape down a square of sheet poly 12x12" and see if moisture shows up under it after a day or two. If moisture shows up, you have a problem with a perimeter drain around the outside.
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Old 11-16-2018, 05:18 PM   #11
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Re: setting sleepers without breaking concrete moisture seal


Nealtw's idea to test the moisture level of the slab is often sited, but I've read somewhere that it is not always reliable. I'd suggest a moisture meter instead and read it over some time, when outside is raining and dry. But if you have a radiant heating pipes in the slab, you should already have a vapor barrier and the insulation under the slab. Since it is upscale heating, such bsmt would have french drains outside as well. Any signs of them, maybe cleanout plugs? Those are the usual construction methods for radiant floors, modern floors anyway.


I think there are now moisture resistant engineered flooring too. Why do you think you want the sleepers? It is relatively dated way of installing a subfloor for indoors. Solid strip flooring is, I think, still not a good idea for bsmts.
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Old 11-16-2018, 05:24 PM   #12
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Re: setting sleepers without breaking concrete moisture seal


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Originally Posted by carpdad View Post
Nealtw's idea to test the moisture level of the slab is often sited, but I've read somewhere that it is not always reliable. I'd suggest a moisture meter instead and read it over some time, when outside is raining and dry. But if you have a radiant heating pipes in the slab, you should already have a vapor barrier and the insulation under the slab. Since it is upscale heating, such bsmt would have french drains outside as well. Any signs of them, maybe cleanout plugs? Those are the usual construction methods for radiant floors, modern floors anyway.


I think there are now moisture resistant engineered flooring too. Why do you think you want the sleepers? It is relatively dated way of installing a subfloor for indoors. Solid strip flooring is, I think, still not a good idea for bsmts.
yeah i think ill get a moisture reader when we get to the installation of the foundation. we're located in Estonia, and right now a decent parkett (as they call it here) goes for minimum 25 per m2, if we do sleepers and planks we can do it for around 8-10, and will have a nicer rustic/cabin feel to our home.

The foundation will also be a monolith slab, no basement.

Thanks for the help!
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