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Garage slab with no vapor barrier

Posted by wianno (My Page) on
Fri, May 27, 11 at 15:46

Everything I read says you should always put a vapor barrier/retarder under a slab on grade. Whats the harm?

My contractor is arguing the point. He thinks the slab will "float" or that the trapped water will be bad. I disagree, but how hard should I fight it?

Its a slab on grade for the garage, living space above that. I may just put 6 mil down myself this weekedn in prep or the pour.


Follow-Up Postings:

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RE: Garage slab with no vapor barrier

Not needed if the space above the slab is unconditioned and you do not care about moisture levels.

Sidewalks are directly on grade with no barrier.

I would put down the barrier to make the garage dryer and more comfortable.


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RE: Garage slab with no vapor barrier

The contractor just doesn't want to have to remove excessive bleed water. Use a stiff, low water mix.


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