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Funny enough I was reading up on a similar topic recently, energy efficient home design rather than obs.
One of the condensation solutions they put up were one way membranes which were intended to allow moisture to pass through one way but not the other to prevent or reduce condensation in well sealed houses.
In context, one thing that was suggested was one of these membranes under condensation prone materials like metallic roofing, so moisture passes through the membrane from bottom to top and then drains along the top of the membrane to the roof edge rather than forming under the roof and dripping.
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