Fact Check – Insulating a knee wall in a vented attic- Zone 4a
For an attic to bedroom conversion in vented attic, Im planning on insulating my truss/knee wall 2×4 16 oc bays with r16 rock wool batts and rigid polyiso foam.
Prior to install of the rock wool, I will install 2″ rigid foam with foil backing against the exterior side (facing attic space) with foil facing cold side and then foam air sealed. This will gain a overall r value of 26. The warm side of the wall will be rocked with 1/2 inch drywall.
Question: Will this work? From what Ive read on this forum, I think it will but I still get a bit confused with so much good info.
Thanks in advance.
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