Insulation for exposed roof rafter cathedral ceiling?
JNMadson
| Posted in Energy, Heating & Insulation on
I’m designing a home that will have a couple of rooms with a cathedral ceiling matching the roofline, and would like to have the rafters exposed. I’m wondering how to accomplish this and still get adequate R-value insulation for this space, as there would be no attic space in this area. Could rigid insulation be adequate on it’s own, inserted b/w the exposed rafters? SIPs? I know that one option is to simply drop the ceiling and have exposed “rafters” that are decorative only, however this would not be the preferred option. Would prefer to work with the actual roof rafters and am looking for an innovative solution / product.
Replies
Problem is, you want an unnatural thing to look "natural". Any way you do it some degree of fakery is involved.
Best solution is SIPs or the equivalent: foam insulation placed on top of the sheathing, with more sheathing on top of the foam. This can create a roof profile that looks too thick from the outside, though, if that aspect isn't planned/faked well enough.
There are
ways of framing the roof so that the fascia board height is normal even with plenty of room for insulation over exposed beams.
Like I said, you've got to plan to fake it in advance.