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Old 01-17-2008, 02:46 PM   #1
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bathroom basement subfloor on concrete slab


What is the best basement subfloor to install over a concrete slab, below grade, northern climate, concrete is level, clean and prepped, for a small 10' x 7' bathroom? I was thinking vapor barrier (polyethylene) with 3/4" plywood over the top. Planning on vinyl flooring for finish, any suggestions?

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Old 01-17-2008, 02:54 PM   #2
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bathroom basement subfloor on concrete slab


use those orange membrane like plastic but with cloths. thing... forget its name somthing like ditel....etc.....they are not flat ...

it is quite expensive but it is very good.....

you can use those other tiling backer blocks but plywood definitely an older technology and shouldn't be used....

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Old 01-17-2008, 04:22 PM   #3
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bathroom basement subfloor on concrete slab


how thick is this stuff ?

why can't tiles go directly on the concrete ?

should this be done across the whole basement or just in the bathroom ?

if i plan to have carpet in most of my concrete slab basement apartment, does anything need to be in between ?

thx,

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Old 01-17-2008, 05:47 PM   #4
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bathroom basement subfloor on concrete slab


Where can I find the orange backer cloth's? Home Depot? What would you recommend instead of a plywood subfloor? I could use sleepers,but I want to keep the height down, I don't want a big lip into the bathroom. Maybe 1" x 2" s?
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Old 01-18-2008, 11:08 AM   #5
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bathroom basement subfloor on concrete slab


the orange stuff is really thin... thickness is neglectable.... that stuff is either called ditel or dicore... I kind of forget....
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Old 01-18-2008, 11:35 AM   #6
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bathroom basement subfloor on concrete slab


vapor barrier (polyethylene) with 3/4" plywood over the top is what i would use. Remember that basements retain a lot of moisture, therefore, having any kind of padding/sub flooring will make your floors a lot less cold in the winter.
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Old 01-18-2008, 11:38 AM   #7
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bathroom basement subfloor on concrete slab


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Originally Posted by KUI****G View Post
use those orange membrane like plastic but with cloths. thing... forget its name somthing like ditel....etc.....they are not flat ...

it is quite expensive but it is very good.....

you can use those other tiling backer blocks but plywood definitely an older technology and shouldn't be used....
Are you speaking about the ceramic tile product, Ditra? He said he's putting down vinyl. It would really help if you read the post before making incorrect comments especially when the poster didn't realize you were speaking about the wrong product for his stated application.
You can put the vinyl right on the concrete if it's as flat as you say it is.
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Old 01-18-2008, 01:52 PM   #8
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bathroom basement subfloor on concrete slab


you are right... didn't see it is vinyl.... I thought he will use ceremic tiles.........
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Old 01-19-2008, 02:35 PM   #9
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bathroom basement subfloor on concrete slab


To minimize the height difference you can put down foamboard down between some sleepers. Decide how high you can live with and use the appropriate thickness foam. As stated before, use a vapor barrier over the concrete.
You could eliminate the floor buildup all together by using electric radiant floor heat and ceramic tile.
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Old 01-19-2008, 05:57 PM   #10
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bathroom basement subfloor on concrete slab


Thanks for the reply Ron! I think I will use your idea of foamboard between sleepers. I am trying to keep the cost to a minimum so the electric radiant heat under ceramic tile is a little out of my budget. Thanks again and I'm sure I'll have more questions in the future!

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