6 Mil Vapor Barrier Versus 4 Mil - Building & Construction - DIY Chatroom Home Improvement Forum

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Old 09-20-2008, 06:48 PM   #1
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6 mil Vapor Barrier versus 4 mil

Converting 300 sq ft garage into family room. Installing full floor above garage concrete slab. I want to put a polyethylene vapor barrier on the concrete.

Most places I read recommend 6 mil polyethylene. Home Depot selling for $50.

When cleaning out the garage I found a brand new box of 4 mil polyethylene that my Dad had given me.

Would it be a problem if I used the 4 mil that I have, instead of buying 6 mil?

I have a giant box. Can I double-up the 4 mil, creating a 8 mil barrier?



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Old 09-20-2008, 07:53 PM   #2
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The 6 mil requirement beneath slabs is to ensure durability. Since yours isn't beneath a slab, and won't be exposed to damage or foot traffic, I seen no reason 4 mil wouldn't work just fine. No need to double it up.


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