I have a pole barn 30x40 with trusses allowing for a walk up attic area that is 8' tall at the center. The building has a metal roof on 2x4 purlins attached to the 24" on center trusses. The building has a full length continuous ride vent and 1' overhangs that are vented all the way around. I want to insulate the buildings roof or ceiling depending on the best way to hold heat and not form condensation. What would be the best way to do this. Block off all venting and spray foam the metal and purlins or keep the venting open and do something else?
Thanks
Terry Mooney
2013-11-22 17:14:54.000000
Sounds like a good idea. So how would I incorporate the end of the ridged foam where it has to meet the roof vent and the soffit? The only pics I have right now are of the framing when it was being built. I will take better ones next time I am there. At the soffit end would I use something like a accuvent soffit vent and do foam board from there up and spray over all of it?
Terry Mooney
2013-11-22 19:14:33.000000
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Terry Mooney
2013-11-22 20:30:39.000000
I never like spraying foam directly to metal but it is permissible with the right applicator.
I would prefer to sheet the purlins with rigid foam facing the attic side and shoot the foam to that side or just detail all the seam and seal it up and use traditional insulation at that point.
This would give you a sort of over deck venting and allow you to keep the venting to allow any moisture out but would keep the bulk of the moisture from condensing on the roof surface.
Post up a picture if you can.
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