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Old 01-07-2017, 02:32 PM   #1
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Stop tin roof condensation question


Hi all ive got a tin corrugated garage roof which suffers from really bad condensation at times. I have purchased all materials to build a false ceiling inside the garage using 50mm polystyrene insulation, 2x2 , 12mm external ply etc etc. I also purchased a plastic sheeting called visqueen which is a damp proof membrane. Now my plan is to have a 50mm gap between the tin roof and my insulation for the false ceiling and open vents to allow the air between to escape. My question is would the damp proof sheeting be better placed directly (glued) on to the metal sheeting and tucked at the corrugations or is it just as effective to be placed on top of the insulation just before the ply sheets are screwed in ? Im not a joiner and it doesnt have to be to spec i just want it to be dry and warmer than it is thanks
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Old 01-07-2017, 03:03 PM   #2
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Re: Stop tin roof condensation question


Spray foam between the rafters, right onto the bottom of the metal roof. that is what we did in my sister's horse barn. Then we covered the rafters with cheap plywood.
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Old 01-07-2017, 11:01 PM   #3
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Re: Stop tin roof condensation question


Quote:
Hi all ive got a tin corrugated garage roof which suffers from really bad condensation at times.
Twice a year, during Spring and Fall, I will bet.
Those are the times when the Dew Point of the air causes the condensation on the underside of Metal Roofing. Usually there would be building paper or a similar product underneath the metal to drain away the condensation so it is not an issue.
If the metal was installed without the building paper, you would need to do the spray foam per above or remove the roofing, install the paper and reinstall the metal.
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Old 01-08-2017, 06:23 AM   #4
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Thanks for your reply yeah no paper just the metal at the moment. Ive already bought the visqueen damp proof membrane so plan on using this with a 50mm air gap between the false ceiling and tin roof then add air vents to allow the air in the gap to be exchanged to try to stop any water droplets forming. I dont really want to buy any more materials so would like to use what i have
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