Author Topic: Any experiences with felt on underside of purlin/metal roof for condensation?  (Read 170 times)

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Offline NathanS

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  • NY Mountains
For an extra $1 a linear foot I could get a felt membrane that is supposed to control condensation and prevent it from dripping from the underside of metal panels that are on purlins. I am curious if anyone has seen this stuff in action.

The alternative would be to sheath the roof with 1x Hemlock and cover it with tar paper. Which, costs about ~$300-350 more. (Cost of 1x + tar paper ~ $700 vs ~$400 for the felt)

The advantage really just seems to be how much quicker it would be to install the roofing on what amounts to a big ladder that spans the width of the building. If the felt didn't work it would be a nightmare. We go below the dew point virtually every night during the growing season.

Offline Don_P

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  • Posts: 4,597
The felt works here. I've seen the dripstop metal advertised for several years but no experience with it.


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