Insulating A Cathedral Ceiling Spray Foam

I m in the early stages of building an amazing workshop to showcase tools over at tool box buzz and shop projects here at hci.

Insulating a cathedral ceiling spray foam.

From my research i thought i needed at least an r40 of insulation in a cathedral ceiling in my zone. However if you are determined to build an unvented roof then i think that closed cell foam insulation is a better choice. Using foam it green spray foam insulation in your cathedral ceiling can give you much. Treat your cathedral ceiling just like a wall with a different angle.

The higher r value reduces condensation when moist interior air hits the now less cold ceiling vice versa in summer with humid outside air. Cathedral ceilings insulating with spray foam cathedral ceilings unvented how to seal. I just had 3 inches of closed cell foam r21 installed on inside of my cathedral ceiling new const and was planning on adding r19 batt fiberglass over the spray foam. Check out the overhead project video to get some tips and techniques to make this project easier.

The new workshop will be located over my garage in an area that was framed using attic trusses when we built the new house. Insulating cathedral ceilings can be quite challenging. Attic trusses typically have a sloping ceiling. The spray foam contractor says i m wasting my money since the closed cell foam is 97 efficient.

I am wondering if i can attach craft paper and pine paneling to the 2x8 rafters and then fill the bays with cellulose. Hi steve i very much appreciate the quick and detailed reply. Foam it green spray foam bonds overhead. High density urethane spray foam provides an airtight seal and high r values making it a good choice for unvented cathedral ceilings.

Yes it s completely open from below with the rafters and roof sheathing all exposed see photo. First closed cell foam has a 60 percent higher r value per inch than open cell 6 3 vs. One of the best options would be spray foam insulation here s why. A cathedral ceiling is often difficult to insulate as they leave very little room for ventilation which is needed to keep the insulation dry.

May 30 2020 at 9 57 am. I want to properly insulate my cathedral ceilings and was thinking to spray 2 inches of closed cell foam to sheathing then fill with dense packed cellulose. 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. Cathedral ceilings spray foam insulation.