Denny Turk
7/13/2010
I have a pole barn with metal roof panels screwed to 1x4 purlins nailed to 2x8 rafters,no sheating and no felt for dry in.I am converting this in to a garage.I know the roof will sweat in the winter and want to prevent this without removing the metal panels.I have 4x8x5" thick styrofoam panels,I'm thinking if I cut these down to fit between the rafters and install them flush with the bottom of the the rafter leaving a 3" air gap between styrofoam and metal roof panels.I'm not sure gap or no gap.I will be heating in the winter.What do you think?Any ideas?Thanks in advance for your help Denny
Eric Novotny
An informed customer is the Best Customer!
7/14/2010
If you can see the underside of the roof from inside the barn, why not just have someone come out and spray foam it. Might be cheaper when you figure in removing the old panels and putting the roof back on.
Guest User
7/14/2010
They want 2000.00 dollars to spray the underside of the roof.I already 80 sheets of the styrofoam and my labor is free.Do you think my idea will solve the problem?Thanx Denny
Eric Novotny
An informed customer is the Best Customer!
7/16/2010
You can do that but you will have to make sure that they are relatively airtight to the rafters so that warm moist air is not making it to the underside of the roof. The roof will still sweat if there is an area for air to leave your Styrofoam layer and contact the roof.
Guest User
7/16/2010
Thanx, thats what I thought I just wanted a second opinion,I am sheeting in the hole under side after I insulate.Thanx for your help. Denny
Eric Novotny
An informed customer is the Best Customer!
7/17/2010
You bet. Good luck.
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