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-   -   Insulating attic wall shared with living space (http://www.diychatroom.com/f103/insulating-attic-wall-shared-living-space-149803/)

BlueBSH 07-10-2012 02:08 PM

Insulating attic wall shared with living space
 
Try this again... tried to post this 5 times today every time it fails... :huh:

anyways..


I have a house constructed in 1996 which is 2 stories, and then it has a 1 story master suite which has attic space from a gabled attic that butts up against the house (standard gable attic, triangular ends against the houe and to the outside)

this wall that the attic butts against is not insulated, not sure why, but its not and of course its cold in the winter against that wall. the inside is completely finished and drywalled, the attic wall is just studds and you can see the inside drywall (2x4 studds in this part, nut sure why, the rest of the houe is all 2x6 *shrugs*)

I want to insulate this wall with roxul insulation to get a little more r-value then fiberglass, in addition to the sound deadening and increased firestopping you get with roxul.. but of course roxul has no vapor barrier

do I need a vapor barrier here? I assumed yes since its unconditioned attic space touching conditioned space, but then none of my ceilings have vapor barriers.. (I live near pittsburgh, pa so not sure what our region wants / requires)

if it does have to have a vapor barrier, what do you suggest? I don't want to go fiberglass, and cellulose would be in the same category as roxul for the vapor retarder

Windows on Wash 07-11-2012 06:06 PM

Picture would be very helpful here, however, the general answer to your question would be no.

Vapor barriers are overused and largely unnecessary in most of the climate regions.

Gary in WA 07-12-2012 11:04 PM

"do I need a vapor barrier here? I assumed yes since its unconditioned attic space touching conditioned space, but then none of my ceilings have vapor barriers.. (I live near pittsburgh, pa so not sure what our region wants / requires)"-------------------

You are in Zone 5, Fig.#3: http://www.buildingscience.com/docum...nd-wall-design

Gary


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