2 x 6 cathedral ceiling insulation plan
I have a 1 1/2 story cabin that I am insulating. The second story was constructed using engineered attic trusses. The top chords are 2 x 6 and the knee walls are 2 x 4. Metal roof with soffit vents and ridge vents. My plan is to fur the sloped top chord with a 2 x 4 on edge. This would provide me with 9" of space. I will put allow 2" of ventilation space and install 1.5 " XPS rigid foam board as my baffles, followed by 5.5" of roxul comfort batts, 6 mil poly vapour barrier and drywall. The 2 x 4 kneewall I will build out also with 2 x 4, giving me 7 inches of space to fill. I will place 1 inch rigid foam as an air barrier for the back of knee wall, followed by 5.5 inch roxul, and vapour barrier, drywall. I will air seal everything with caulking and great stuff spray foam. Does this sound like a good method. Should I still be concerned with thermal bridging? Would an additional layer of rigid foam before the drywall be advised?
Posted Sat, 08/30/2014 - 19:07
Other Questions in General questions
Since drywall has a permeance of 0.02 liter/sec - m at 75 PA is ever possible to have sheathing dry to the interior of the home?