Replies

1. 
   PASSIN | Sep 29, 2008 07:05am | #1

   i was concerned about using it for the first time about 6-7 years ago. After talking about it with my insulator he stated that almost nobody was using poly anymore, everybody was switching over to paint. I did a little checking on products and talked it over with a builder i ran into at the lumber yard who had said he had nt had any problems

   So i started using it and to date have not had any problems that im aware of. My new insulator doesnt even offer to do poly.

   I use Sherwin williams- Vapor prime? in place of pva primer. Works pretty good for primer.

   I would talk to home inspectors (the ones who see issues years after certain products have been installed) from your local area, and ask your insulation contractor what others are doing.

1. 
   Tyr | Sep 29, 2008 08:48am | #3

   Well I've never heard of it. Kind of reminds me of waterproofing paint for concrete foundations applied to the inside--not the way to go. I'm trying to figure out what surface you paint. Not the stud wall with insulation installed so do you paint the backside of the gypboard before cutting and hanging? Tyr

1. 
   Bish | Sep 29, 2008 02:11pm | #4

   You paint inside surface of drywall. The purpose in our climate is to stop vapor transmission from the warm living space, out thru the wall assembly, where it eventually would condensate as it reaches the dew point temperature. This would result in wet insulation.We have also switched to this type barrier, along with spray foam insulations.

1. 
   Tyr | Oct 02, 2008 03:03am | #5

   Thanks. That would be the same here as few residential living spaces are air conditioned although swamp coolers have become more popular recently and they increase the humidity within the house. The greatest problem I usually find is the use of gypboard over poly which is then tiled in baths. Green/blue board is minimally better. Replacement with Durock, retiling, and grouting gets expensive. Few homeowners reseal their grouting annually either. I just had never heard of VB paint. Tyr

1. 
   mmoogie | Oct 02, 2008 03:07am | #6

   By the time the wall has a coat o primer and two coats of topcoat, it's pretty much a vapor barrier anyway.Steve

2. 
   BillHartmann | Sep 29, 2008 07:40am | #2

   "that the moisture level in the drywall still may cause moisture issues with it coming in from the back. "

   Now does it come "from the back".

   What is your climate (location). In many parts of the US moisture moves in either direction depending on the season.

   With poly you can get condensation on the backside and now way for it to dry out.

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   A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.
3. 
   fingersandtoes | Oct 02, 2008 11:32am | #7

   Getting an effective vb using paint rather than poly means rethinking all the intersections and penetrations that are usually sealed by poly and tape. Places like the rim joists, sill plates, etc. It's not hard, it's just different.