I am insulating un-conditioned storage space in 1-1/2 story house, central NC. Items stored in the space suffer from heat/cool cycling as well as summer humidity. Also, there’s only a closet door with virtually no insulation separating the storage space from living area. I’d like to use this space as a walk-in closet.
The space is at the base of a valley (12/12 pitch, both slopes). There is no soffit venting at the bottom of the valley, but there is soffit / ridge venting for the rest of the roof. Sheathing is plywood, shingles are FG. The house is 17 years old. Do I need to ensure air flow between the sheathing and the pink FG kraft-faced insulation (paper toward room), or can I insulate and not worry about lack of air flow creating moisture and/or heat build-up? The valley points north-west, so has afternoon sun. The spaces between the joists would have no air flowing in (except maybe air leaks from 1st floor or exterior). Any advice appreciated.
Geoff
Replies
If those bayes aren't vented, you can put a 2" layer of foam under the rafters, then cover that with new drywall. That sould buffer the temp swings enough to make it more usable.
Hey Geoff,
If you're looking at storage space/walk in closet that MUST keep a consistent temperature, you might want to look at a seal insulation combo like this one from Owens Corning. There's a lot that can be said about the R-value of a particular insulation, but this system works in multiple ways to make sure ensure a comfortable and efficient space.
Ventilation can be a concern for any storage space. Are you loking to keep the closet open or put a door on the opening?
Geoff -- apologies....
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I'm not a spammer, just trying to help folks with their questions around forums and I do digital work for Owens Corning.