Member
Join Date: Apr 2005
Posts: 118
NY
08-29-06, 04:09 AM
#1
Insulating Garage-vapor barrior needed?
Hi and Thanks in advance for your time-
I am insulating an existing attached garage. The previous insulation was inferior, as it was installed in the 1950's, and was of low R value. I am installing R-13 in the exterior 2x4 walls, and R-19 in the 2x6 ceiling (all Kraft faced). The garage has a concrete floor. I will be using epoxy paint on the floor. Also- I will be installing electric radiant heat panels to keep the garage at around 45 degrees in the winter. There is no rot or moisture issue in the garage at present. My question is-do I need to install a polyethelene vapor barrier over the insulation, or do I just leave it without. Previously ther was no vapor barrier.This will be covered by 5/8" sheetrock.
Thanks.
Ray.
I am insulating an existing attached garage. The previous insulation was inferior, as it was installed in the 1950's, and was of low R value. I am installing R-13 in the exterior 2x4 walls, and R-19 in the 2x6 ceiling (all Kraft faced). The garage has a concrete floor. I will be using epoxy paint on the floor. Also- I will be installing electric radiant heat panels to keep the garage at around 45 degrees in the winter. There is no rot or moisture issue in the garage at present. My question is-do I need to install a polyethelene vapor barrier over the insulation, or do I just leave it without. Previously ther was no vapor barrier.This will be covered by 5/8" sheetrock.
Thanks.
Ray.
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Join Date: Nov 2005
Posts: 2,459
HI
Member
Join Date: Aug 2002
Posts: 18,389
MO
09-05-06, 09:21 AM
#5
Use a poly V/B over the paper. I dont care how hard you try you cant get a seal on the walls with just paper back insulation. We put it on the walls and over any door or windows. Then dry wall after done cut the door and windows out of it. Hey you got clean windows and doors.
ED
ED
Member
Join Date: Jul 2005
Posts: 857
09-06-06, 04:54 AM
#6
Posted By: xiphias Elsewhere, kraft facing is generally considered appropriate.It may be appropriate in your area, but it is not superior to poly. Codes are the minimum building requirements, so it is always best to improve on them when building.
As Ed stated, it is impossible to get a good seal on the Kraft paper.
Posted By: xiphias Check out http://www.buildingscience.com/resources/walls/Vapor_Barriers_Wall_Design.pdfNot in my opinion. I believe most people are misinterpreting the information on this site.
the site is a gold mine.
