Reply by clin

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Posted on Vapor barrier for metal roof?

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1057 posts in 1477 days

#1 posted 12-10-2017 10:15 PM

I also like the foam idea. But, if more conventional and DIY, whatever you do, keep a ventilated airspace under that roof. Note: VENTILATED.

No matter how good a vapor barrier, moisture will get in. Even some from the outside. So you need to allow it to get out quickly. This will reduce condensation and when there is condensation it will evaporate more quickly.

All of this also depends on where you live. There generally is no perfect solution, so you want the one that is best for your area most of the time. This is where contacting local experts is valuable. I would think the local metal building contractors would know what is best.

But, foam looks darn good for this application.

-- Clin

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