Guest User
2/27/2008
I had a pole barn built with a concrete floor and I have installed insulation in the walls and ceiling. I use it as a cabin. My metal roof was installed over the trusses with no barrier under it. I have since learned of a product that some people have used that is place down before the roof goes down. Should they have put a barrier under the roof? I am worried about condensation dripping onto the insulation. If so what do I do about it now? I do have soffit vents and ridge vent. Thanks
Guest User
2/27/2008
If you used vinyl faced fiberglass over open purlins you shouldn't have a problem if the vinyl is not tore and you have it lapped right. If you have tears in the vinyl they make a tape for that and I would definitely use it.
Guest User
2/28/2008
No they did not use anything under the roof. The roof is attached to the purlins. The purlins are attached to scissor trusses. I placed unfaced insulation between the trusses and used poly as a vapor barrier facing the living area. My ? is - what do I do about possible condensation dripping from the roof onto the insulation. I can't very well take the roof off and put down a barrier on top of purlins and then put the roof back on. Do I have any other options at this point. I have not really had any issues with condensation that I can see. Because I have the insulation in place I can't really see how much condesation is taking place- its what I can't see that has me woorried. I don't want to drywall the ceiling only to find out later I have a problem. What about a gable end fan? Thanks for your replies!
Todd Miller
Isaiah Industries, Inc.
3/1/2008
A gable end fan could help to move out heat and moisture at the peak. However, what Wade is saying is correct -- if the insulation you used has a vinyl facing and you tape the seams, then it behaves as its own vapor barrier. If it is not vinyl faced you can still add a vapor barrier on the bottom side of the insulation.
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