Insulation, Radiant and Vapor Barriers - vapor barrier in the basement

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theamerican
11-01-06, 10:04 AM
Is 2 mil ok to use for this purpose, it will be between the block and the stud wall?

Concretemasonry
11-01-06, 10:21 AM
You will find as many different opinions od vapor barriers in basements as there are basements - total.

If it is open and not sealed at the edges, it probably does not make any difference. - You probably do not have every square inch of you basement walls finished and covered anyway. (it seems there is always an unfinished space/room and your doors to the rooms are not sealed).

Dick
Ed Imeduc
11-01-06, 10:32 AM
Id say yes . Its just that we use a 6 mil on the cement walls as it dont get a hole in it as easy. Have used 2 mil in the inside over the paper back insulation. But dont know why around here all I can find now is 4mil and on up.

ED ;)

theamerican
11-01-06, 11:16 AM
You're right, the walls will not have been refinished. That makes sense; why have a thick barrier when the edges will not be sealed. I just wanted some expert advice, thanks to both. Should the barrier extend under the stud wall, or just hang into the space between the slab and the walls?
Ed Imeduc
11-01-06, 11:37 AM
i like to set the bottom plate on the poly if its there. Also dont forget use a P/T 2X4 for the bottom plate.
theamerican
11-01-06, 12:13 PM
I definitely will use the p/t. Two more questions, should I use liquid nails and tapcons, or just the tapcons? Also, at this point, the walls don't have to be sealed with drylok, right?