Walls for very cold climate
We’re building a post-and-beam home in the Colorado mountains (Zone 7) and have an insulation dilemma. I’ve read a lot of articles here, but haven’t been able to determine the solution to our energy efficiency problem.
The panels between the posts are currently designed as: exterior log paneling (2″), wrap, osb sheathing, 2×6 studs filled with open cell foam, interior finishes (gypsum or osb/paneling). We would like to improve the overall R-value, but can’t add a great deal of thickness to the wall for appearance reasons with the post-and-beam style. Builder suggesting we replace wrap/osb with either 1.5″ Zip-R panels or 1″ Tuff-R panels to break thermal bridging and add continuous insulation R-value. This is about the thickest material the design will tolerate. If the cavity insulation remains open cell foam, doesn’t that potentially create a condensation point on the inside of the sheathing? Should we consider backing the sheathing with 2″ of closed cell foam and then fill the rest of the cavity with either open cell foam or other materials?
What are people’s experiences with Zip-R or Tuff-R insulating products?
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