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Old 01-04-2010, 06:46 AM   #1
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gambrel roof insulation


I'm in the process of renovating a barn with a gambrel roof. We're far from finished but we moved in anyway. We recently noticed major condensation and moisture dripping inside after a quick thaw after a cold spell, and I wondered if I made a mistake in insulating. The moisture went away quickly on its own once the temp dropped again.
It has metal roofing and I used the pink 2" Raft r mate, on the underside before installing the batt insulation. The Raft r mate is advertised as attic venting and this is not an attic, so is it necessary and could this have contributed to this problem? Any other suggestions?

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Old 01-04-2010, 09:16 AM   #2
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Did you run the Rafter mate the entirety of your rafter cavity?

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Old 01-05-2010, 07:18 AM   #3
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Quote:
Originally Posted by mark942 View Post
Did you run the Rafter mate the entirety of your rafter cavity?
Yes, everywhere.
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Old 01-06-2010, 06:47 PM   #4
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issue and have heard a dozen fixes,none of them very appealing.as soon as the heat makes it through the insulation the roof condensates and it rains on the inside.ive been told to put up a barrier,remove insulation,add twirly birds,stop breathin,add moisture barrier to the ground ect..let me know what you find out,
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Old 01-06-2010, 09:59 PM   #5
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gambrel roof insulation


The baffles allow air from the soffit intake vents to reach the ridge exhaust vent. As per directions, you left 2" between each. http://www.owenscorning.com/around/v...s/VentSure.pdf

1. Then the fiberglass batts, faced- or unfaced?

2. Your location may require a vapor barrier behind the drywall: http://www.buildingscience.com/docum...ecommendations

3. You need an air barrier: http://www.buildingscience.com/docum...wall-approach/

4. or possibly some rigid foam board: http://www.buildingscience.com/docum...on?full_view=1

Be safe, Gary
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Old 01-07-2010, 07:36 PM   #6
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if you would do me the favor look under roofin of last year in late december.look for metal roof condensation i posted pixs of my cabin and how i installed the egg crate and insulation.thank you in advance and so long 4 now john

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