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Discussion Starter · #1 ·
Hi... I am construction a 24X20 two story house.

I want to install a cheap vapor barrier. Can I use cheap 4 mil plastic on the outside over my sheeting and on the inside between the insulation and the sheetrock?

I am in Montana. Cold and dry in the winter. Warm and dry in the summer.

Thanks

T
 

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Naildriver
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Why "cheap"??? Why not do it right and use Tyvek on the exterior sheathing as a weather resistive barrier and 4 mil over your interior insulation.
 

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If you want cheap, use 15# roofing felt on the outside (a lot of us think roofing felt is a better siding underlayment than Tyveck). 4 mil poly will be fine on the inside. DO NOT use poly on the outside...that will just trap moisture and lead to rot.
 
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