DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > plastic over insulation?




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Old 08-25-2007, 11:00 AM  
ALPS
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Default plastic over insulation?

Any benefit to putting up plastic over the insulation before hanging dry wall? Aside from time and minimal cost, any drawbacks?

The insulation does have a moisture barrier, but someone told be that covering it with plastic is a good idea, especially in a high moisture area, like a bathroom.
This wiil be in a closet that has one exterior wall and three interior, with one (the longest) separating the closet from a future bathroom.



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Old 08-25-2007, 03:40 PM  
inspectorD
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Default No benefites

Plastic is a bad vapor barrier..period. I would stick with the paper faced insulation and be done.
If you were to install plastic over the paper you would have 2 vapor barriers..can you see it raining in your home? This is a no-no in the vapor police book.

Paper lets the moisture collect a bit then releases it..plastic just runs down the wall. I have been in homes where the plywood at the exterior wall floor area was rotting through. These where extreme condition but better to er on the side of caution.

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