Comfert-therm plastic covered batts?


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Old 08-21-13, 11:41 AM
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Vapor barrier and Comfort-therm plastic covered batts?

I want to insulate my previously uninsulated exterior walls. (Atlanta, Ga., Zone 3) My exterior sheathing is made up of diagonal boards, so there are gaps, even though it is covered by Tyvek.

I liked the idea of the plastic covered batt insulation because it seemed like it would be more resistant to air/moisture/insects that might penetrate the sheathing. This is the product I am looking at.

Shop Johns Manville 11-Pack 93-in L x 15-in W x 3-1/2-in D R-13 Fiberglass Insulation Batts at Lowes.com

My question is regarding vapor barrier. This product comes either with or without a vapor retarder. Is there any reason I should get it without a vapor retarder since I have tyvek on the sheathing, or is it ok to have both? Thanks, Tony
 

Last edited by Tony Gutierrez; 08-21-13 at 12:50 PM.
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Old 08-22-13, 06:31 PM
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Old 08-26-13, 06:22 AM
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According to that I do not need an interior Vapor barrier in Zone 3. But the local hardware stores do not carry the comfort therm without it. I tried to ask at Lowes if it would be ok and the guy didnt even know what a vapor barrier is.

Can anyone break this down for me?
 
 

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