DIY Home Improvement Forum banner

1 - 13 of 13 Posts

·
Registered
Joined
·
15 Posts
Discussion Starter #1
In an unfinished basement (walkout basement), is it common (or okay) to install faced fiberglass insulation in the wood framed wall with the paper toward the outside?

I figure this was done to pass fire code, but will it create vapor issues?
 

·
Registered
Joined
·
37,264 Posts
Please go back and add your location to your profile, yes it makes a differance.
 

·
Registered
Joined
·
1,311 Posts
In an unfinished basement (walkout basement), is it common (or okay) to install faced fiberglass insulation in the wood framed wall with the paper toward the outside?

I figure this was done to pass fire code, but will it create vapor issues?
The only place I know of were one can put the kraft face batt to the out side is Florida.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #4
I'm in east Tn.
~1200ft

My assumption is that the installer didn't have any unfaced in the truck, so he turned it backwards so he wouldn't have to cover it (with drywall) to meet code.

I do plan to finish the basement, but probably not for 1-3 years...will I be okay until then?
 

·
Mold!! Let's kill it!
Joined
·
2,849 Posts
The problem you have is twofold. The paper facer acts as a vapor retarder and should be placed toward the "warm in Winter" side of the floor or wall assembly. The second problem is that the facer, being exposed, presents a combustion hazard and needs to be covered.
 

·
Registered
Joined
·
1,311 Posts
I'm in east Tn.
~1200ft

My assumption is that the installer didn't have any unfaced in the truck, so he turned it backwards so he wouldn't have to cover it (with drywall) to meet code.

I do plan to finish the basement, but probably not for 1-3 years...will I be okay until then?
a simple solution to your problem is just gently pull the kraft face off.
 

·
Registered
Joined
·
15 Posts
Discussion Starter #10
I'm in zone 4a...so does that mean I NEVER have to use interior vapor barrier...regardless of class 1, 2 or 3?
 

·
Registered
Joined
·
15 Posts
Discussion Starter #12 (Edited)
nailbags, I'm guessing you are in zone 4c, which is required to have a class 1 or 2 vapor barrier. (according to the link provided by Gary above)

Also from that link...

"No interior vapor control required on the interior side of framed walls in climate zones 1, 2, 3, 4a, or 4b. In hot, humid climates, a Class I or II vapor control layer on the interior of the framing can, and often does, cause premature building enclosure failure due to inward moisture drive condensation (see RR-9302: Humidity Control in the Humid South). BSC recommends avoiding Class I or II vapor control layer on the interior in these zones, or any material that acts inadvertently like a Class I or II vapor control layer such as reflective foil insulations, vinyl wall coverings, glass mirrors and epoxy paints."

If that is indeed true, then why the heck do people tout the use of 2" XPS in rim joists (see other thread) which I believe is a class 2 vapor barrier?
 

·
Registered User
Joined
·
11,730 Posts
The foam is on the outside of the warm cavity, next to the exterior- not at the drywall, but after the insulation.

Gary
 
1 - 13 of 13 Posts
Top