I will be having a 30x40 pole barn/building constructed for a work shop. I plan to use closed cell spray foam for the exterior walls but i am unsure how the best way to go about sealing/insulating the ceiling and/or roof. Should i spray foam the underside of the roof as well or would it be better to put a ceiling/liner on the bottom of the trusses then blow in some cellulose or artic cat fiberglass on top of that? If i go the latter route would there be any issues with condensation forming on the bottom of the roof tin? Thanks for your input.

Posted By DENALI on 05 Jul 2012 05:06 PM
I will be having a 30x40 pole barn/building constructed for a work shop. I plan to use closed cell spray foam for the exterior walls but i am unsure how the best way to go about sealing/insulating the ceiling and/or roof. Should i spray foam the underside of the roof as well or would it be better to put a ceiling/liner on the bottom of the trusses then blow in some cellulose or artic cat fiberglass on top of that? If i go the latter route would there be any issues with condensation forming on the bottom of the roof tin? Thanks for your input.

SIp Liner Panels
Danali;
If you insulate the ceiling and keep the eave ventlation unobstructed you will not have any problems

You will laso have a much smaller and easier area to heat with a finished ceiling.