However if you are determined to build an unvented roof then i think that closed cell foam insulation is a better choice.
Spray foam insulation vaulted ceiling.
It does not look sealed to the outside at the ridge.
Using foam it green spray foam insulation in your cathedral ceiling can give you much.
There is a major difference in spray foam insulation and sealing with spray foam insulation.
High density urethane spray foam provides an airtight seal and high r values making it a good choice for unvented cathedral ceilings.
Closed cell foam ceiling insulation in a vaulted ceiling offers substantial advantages over open cell.
Spray foam is a very expensive option however.
Foam board insulation would be a more economical especially if you are supplying the labor see photo.
In most cases however insulation will not help prevent moisture.
Foil faced iso board can be cost effective insulation for finished attics and cathedral ceilings.
Insulating a cathedral ceiling with foam it green.
What is going on with vaulted ceiling.
Cathedral ceilings spray foam insulation.
While fiberglass insulation is an excellent and effective product for insulating most building cavities in areas where there is extra risk of trapping moisture and thus rot or mold infections such as crawl spaces and cathedral ceilings where roof venting may be absent or minimal we prefer to use closed cell foam insulation products or spray.
If you re concerned about how you should be insulating cathedral ceilings icynene spray foam insulation is the ideal choice since it can aid in early detection of situations such as roof leaks and wind driven moisture intrusion icynene spray foam ca be applied to insulate any space or unique angle.
Foam it green spray foam bonds overhead.
Treat your cathedral ceiling just like a wall with a different angle.
One of the best options would be spray foam insulation here s why.
The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air.
Check out the overhead project video to get some tips and techniques to make this project easier.