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Vapor barrier under slab?

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Mush07071

Active member
Joined
Jul 24, 2012
Messages
41
Wow, I was just thinking this exact question this morning. Thanks for the link, a little searching proved helpfull.
 
F

Familyof8kids

Well-known member
Joined
Aug 2, 2012
Messages
219
Location
Smyrna, TN
brownbagg said:
hell yes, thick, thick enough not to tear
Click to expand...


Easy enough for anyone to understand and correct in engineer terms for normal people. If you can tear it by hand at the store then the trade can and will during pour time. If you can afford it go with 15 mil and suggest you tape the seams even if you overlap.
 
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Xception

Active member
Joined
Feb 20, 2012
Messages
30
Location
Western Washington
If I had another slab to do I would not use it as I think it lends itself to letting the water out of the concrete too fast. (Less workable time, more cracks) Take it for what it is worth. I am not a professional like some of these guys.
 
C

ConCretin

Well-known member
Joined
Jan 20, 2011
Messages
3,379
Location
Central Maine
Xception, a vapor barrier actually keeps mix water in the concrete by preventing it from being absorbed by the sub grade. It can result in increased bleed water for the same reason. Bleed water can delay finishing operations though it isn't typically a major problem.

In any case, a vapor barrier has no effect on cracking. Installing a vapor barrier is good construction practice and is mandatory if you want to install any kind of adhered floor covering.
 
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