Foam Insulation on outside of walls?
Moved to Kenai Peninsula of Alaska (S. of Anchorage)from Ketchikan (rain country – ave. 162 inches per year and no temps below zero), so lack of daylight and cold (-20 or -30) are big factors in winter. The May issue of Fine Homebuilding (#194) article “Remodeling for Energy Efficiency” has authors placing foam insulation outside the original sheathing, then resheathing over that. Aren’t they trapping moisture inside the walls? If not, why not, and where can i read about the proper techniques to replicate that on houses up here?
Dealing with a 1950’s house currently, would prefer not to take the inside paneling/sheetrock/etc off the walls. Don’t even know yet if there is a plastic vapor barrier. Do i bite the bullet and take a wall apart?
The original sheathing is wood, some early version of t-111. For FireWise purposes here in spruce-bark-beetle-kill land, I’d use Hardi-plank.
If there is already a discussion of this, please point me at it.