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Old 12-26-2009, 06:46 PM   #1
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White poly under concrete ?


Anyone against the white poly on one side for the bubble insulation for under concrete slab ? Everything Ive read thus far says that the lime in the concrete will eat most bubble foil materials and thats what the one side of poly is for. I was going to use it for what little R-value it will have but also as a moisture/vapor/radon break. Any other products I need to consider ?

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Old 12-26-2009, 07:25 PM   #2
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White poly under concrete ?


Better to use 6 mil black poly but you can use the white

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Old 12-26-2009, 08:29 PM   #3
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White poly under concrete ?


Rigid foam board (2") insulation around perimeter (Or as local Building Department requirements) and air seal the plastic: http://www.100khouse.com/2009/06/24/...b-air-sealing/
Don’t use loose sand in certain applications: http://www.stellarcontractors.com/as...loose_sand.pdf


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Old 12-26-2009, 09:31 PM   #4
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White poly under concrete ?


Thanks for the responses and the links. Great information.
This link shows two examples of the products I was talking about.
http://www.buyfoilinsulation.com/und...ation-c-8.html
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Old 12-26-2009, 10:49 PM   #5
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I'm not entirely familiar with that product but suggest you research it more. Foil needs an air space to insulate, not touching: "Underslab insulation is typically of the polystyrene board type where R-values greater than R-1.5 are specified. Reflective foil insulation, on the other hand, requires an air space to be effective although some foil products are approved for underslab applications. R-values on these products are generally R-1.5 or less." From: http://www.radiantpanelassociation.o...cfm?pageid=420

1-4" of dead air space in a wall cavity is R-1. 2" of the pink foam is R-10.

http://www.greenbuildingtalk.com/For...c/Default.aspx

This I found with a short search: http://www.healthyheating.com/Page%2...o_bldg_sys.htm

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Old 12-27-2009, 05:09 AM   #6
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White poly under concrete ?


Interesting that you put the sand on top of the poly DPM. We put the sand below the poly to cover the hardcore.
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The insulation is also put between the slab and wall now, as this is an older diagram.
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Old 12-27-2009, 06:55 AM   #7
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White poly under concrete ?


Well very interesting indeed. I have been reading and researching for the last 1-1/2 hours since I read your posts. In short I can say that Im now 99.99% sure we wont be using bubble foil under the concrete slab.
Thanks for the help.
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Old 12-27-2009, 12:45 PM   #8
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White poly under concrete ?


stego 15mil vapor barrier's the current spec by architects/engineers
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Old 12-27-2009, 06:12 PM   #9
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White poly under concrete ?


Oh yes itsrealltconc. Ive come back to the yellow stuff a couple of times. Ive already called them last week and they have given me two different suppliers in my area. I will give the suppliers a call this week. I just hope I dont get sticker shock $$$$
Thanks for the help
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Old 12-27-2009, 09:55 PM   #10
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White poly under concrete ?


Quote:
Originally Posted by Mudball View Post
Oh yes itsrealltconc. Ive come back to the yellow stuff a couple of times. Ive already called them last week and they have given me two different suppliers in my area. I will give the suppliers a call this week. I just hope I dont get sticker shock $$$$
Thanks for the help


Don't worry, you will.

Far more expensive than 6 mil poly in my experience. Unless you have a known radon problem, I'd steer towards the 6 mil.
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Old 12-27-2009, 10:32 PM   #11
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http://energy.cr.usgs.gov/radon/rnus.html
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Old 12-28-2009, 09:54 PM   #12
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White poly under concrete ?


Thanks for the help and the link. I bought a roll of the stego 15 mil today for 225.00 and that was worth it to me. It is 2.5 times as thick as the 6 mil and when you take the 94.00 I paid for the 6 mil (94 X 2.5 = 235) then it comes close to the same or actually a little better pound for pound for what your getting. I feel much better with this product under the slab.
Thanks again.

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