Insulating a Log Cabin Kit
I’m going to be assembling a 24’x32’ log cabin kit with 6” thick white pine logs this summer in Zone 5, Pennsylvania. It will mostly be three season use with an occasional winter weekend here and there. There will be a full basement, superior walls pre-insulated beneath it.
The way the kit is designed you have to drill and chisel out the log walls for the electrical outlets in the exterior walls. This slows construction and I’ll be rushing to get it under roof. I’ve been toying with the idea of framing out the interior walls. The two options I’ve come up with are:
Continuous R-13 2” Polyiso attached to the walls with furring strips. This option will cost about $3500. Should I be concerned about any moisture issues at the interface of the foil and the logs? While this would be easier than wiring in the logs, I would still have to route the polyiso to run the romex and use old work boxes.
Next option would be to frame out with standard studs and use R-15 rockwool insulation. This would run about $3700 and allow for conventional wiring. This is my preferred method.
Anything else I should be considering?
The ceiling is essentially a cathedral ceiling over the entire cabin framed with 2×10 rafters on a 8:12 pitch.
My current plan is to make site made baffles continuous from the sofit to the ridge vent with ½” polyiso, then insulate with 2×8” R30 rockwool, then cover the underside of the rafters with continous 2” polyiso and strap it with furring strips. This should give me a R-46, which I’m not sure if that’s even required or not. It seems that cathedral ceilings are generally R-30 unless they’re over 500 sqft, which mine is. If anyone has any comments or cheaper suggestions I’m all ears.
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