Do the usual minimum thicknesses apply to "R-Sheathing" products?
Huber and RMax and maybe others offer insulated sheathing - OSB and polyiso fused together with the OSB on the outside. When building a wall assembly with this, do you have to follow the minimum thickness guidelines here:
even though the OSBis on the outside of the envelope and will be able to dry to the outside? Specifically, I'm wondering about a 1.5" R5 insulated sheathing on a 2x6 wall in Southern Maine (Climate Zone 6, but close to 5).
The cavity insulation will either be unfaced batts or Low Density Spray Foam. Will the answer change depending on which of these is chosen?
Posted Sat, 08/17/2013 - 09:33
Other Questions in Energy efficiency and durability