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Old 08-15-2012, 04:21 PM   #1
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vapor barrier under concrete slab


I'm pouring my basement floor/slab in a few days and I had a question. My architect recommended a 10 mil sheet of poly under the slab as a vapor barrier. I'm not going to be able to get a 10 mil sheet by that time but I was wondering if it would be ok if I took two 6 mil sheets and used some sort of silicon around the edges to basically seal them as one sheet. Would this double ply 6 mil basically be the same as a 12 mil sheet (assuming I can keep the moisture from getting in between the 2 sheets)?

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Old 08-15-2012, 05:18 PM   #2
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vapor barrier under concrete slab


How come you can't get the 10mm? We have 10mm at work, and haul it to jobs all the time. Call your concrete supplier and see if they have any.

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Old 08-15-2012, 11:24 PM   #3
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vapor barrier under concrete slab


Yeah, you can do the two layers if you must.
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Old 08-15-2012, 11:32 PM   #4
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Two layers will work and there's no need to try and use silicon.
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Old 08-16-2012, 10:40 AM   #5
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vapor barrier under concrete slab


Quote:
Originally Posted by joecaption View Post
Two layers will work and there's no need to try and use silicon.
Ditto...........
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Old 08-18-2012, 12:16 AM   #6
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vapor barrier under concrete slab


Don't sweat the small stuff; http://www.greenbuildingadvisor.com/...cience-podcast

This was next to that one in my library; http://www.nrmca.org/aboutconcrete/cips/29p.pdf

And the perimeter insulation per code, if in a heating climate; http://www.buildingscience.com/docum...059-slab-happy

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Old 08-19-2012, 07:29 PM   #7
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vapor barrier under concrete slab


Cant they invent insulated concrete?
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Old 08-20-2012, 10:34 AM   #8
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vapor barrier under concrete slab


I'm going to invent self-heating concrete, so I don't have to drive on friggin' snow for 4-5 months out of the year.
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Old 08-20-2012, 11:10 AM   #9
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Electricity heats the roads, heat melts the ice, melted snow drains in reservoir, reservoir feeds turbine, turbine sends electricity to power road heat. Genius

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