What cold wall/vapor profile system is practical to use in Whitehorse, Yukon?
Would you please guide me in understandingthe design for our new house ?
We live in Whitehorse,Yukon Territory, so our goal is super insulated, because
of our cold climate.
While Yukon is mostly a Subarctic/Arctic region, Whitehorse is much milder than the interior Yukon.
Average January temperature
Whitehorse -17.7C Old Crow -31.1
(the record daily low was -52.2 in 1947)
Average July temperature
Whitehorse +14.1C Old Crow +14.6C
I understand interior vapor barrier is appropriate only for severe cold climates, because the wall system must cope with substantial moisture drive from the building interior and into the building envelope during the heating season. Does Whitehorse fall within that parameter and require a interior Class 1 poly barrier?
Different super-insulated homes have started to appear in Whitehorse, double walled cellulose packed, even triple walled batt packed, but they all have interior poly in common.
If appropriate, I would like to utilize a wall system featured in the following article (with the addition of an interior 2x3 horizontal strapped insulated chase wall).
Figure 8: Frame Wall With Exterior Rigid Insulation With Cavity Insulation and Brick or Stone Veneer
Understanding Vapor Barriers/2006-10-24 (rev. April 2011)by Joseph Lstiburek
If this wall system/ vapor profile isn't entirely appropriate, would you kindly help me understand it's shortcoming for the Whitehorse climate, and what would be more suitable?
Brick veneer/cedar siding
Exterior rigid insulation (EPS?)
Plywood or OSB
insulated 6" wood wall
2x3 wood horizontal strapped insulated chase wall
vapor semi-permeable paint
Posted Thu, 11/01/2012 - 15:08
Edited Thu, 11/01/2012 - 15:13
Other Questions in GBA Pro help