Insulating a pole barn
Dear Mr. Holladay,
I recently wrote to you to ask about the possibility of using rigid poly-iso with 6 mil. poly vapor membrane in my unvented 2×8 roof rafters in climate zone 6. You recommended closed cell spray foam instead. Is there any way I can improve on my original design to both solve the condensation problem and come up with a more economical solution. Since I would self-perform the rigid solution and would be installing the membrane myself would careful attention to its installation this resolve the problem with this assembly?