How to insulate attic wall without stud bays
Hello, I’m in zone 2A, I need to insulate a wall that is the side of my cathedral room. The attic is vented and will be insulated with a blown in product (most likely a non fiberglass one). The wall is a truss so it doesn’t have any framing to put batts into, it is already sealed up air tight. I’m wondering how to insulate it though…
It is a 24×6′ triangle, so 72 sqft.
1) DIY spray foam ($450 for R13)
2) somehow attach rockwool batts ($100 for R15)
3) cobble foam insulation two layers of 2″ then fill gaps with can foam ($100 for R15)
4) fiberglass batts ($75 for R19)
Any other ideas? I would like to do the rockwool solution if I could find a way to attach them. HOw can attach batts? Should I use faced or unfaced batts?
The picture shows about half the truss wall, from end to peak.
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