Cross-strapped walls – R value?
I am curious about the R value of a 2×4 and/or 2×6 wall (16 & 24″ oc) with interior 2×2 cross-strapping and wet blown cellulose insulation.
Somewhere I was able to download ASHRAE ratings for typical 2×6 walls etc but did not download or find cross-strapped.
Can anyone direct me to such an R value study?
I am sure the reduction in thermal bridging is more significant than the extra 1.5″ of insulation. (And before anyone suggests exterior XPS I want to use the sheathing for seismic bracing, need the exterior to be vapor permeable due to the wet winters we have, and would like to take advantage of the blown insulation contractor onsite – i.e. one shot deal.)
Edited 9/14/2009 9:04 pm by JohnWalker