A less expensive alternative is the more traditional vented cathedral ceiling insulated with fiberglass cellulose or open cell foam.
Insulating cathedral ceiling with foam board.
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It fills and seals the space and doesn t absorb moisture.
These should have straightforward framing with no skylights and with direct access to soffit and ridge vents.
By the diy experts of the family handyman magazine the foam solution to ceiling moisture problems.
Solve moisture and rot problems in insulated cathedral ceilings with closed cell foam ceiling insulation.
Rigid boards are manufactured from either.
Insulating cathedral ceilings can be quite challenging.
Spray foam is a very expensive option however.
Attic trusses typically have a sloping ceiling.
In most cases however insulation will not help prevent moisture problems.
Foam board insulation would be a more economical especially if you are supplying the labor see photo.
Rigid foam board installation in the case of a cathedral ceiling involves installing three different layers that are each 1 5 inches thick according to the procedure discussed in this article appearing in fine homebuilding.
This is best for simple cathedral ceilings that are easy to ventilate.
Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings.