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Community and Q&A

Condensation in Metal Roof Assembly

krisfox | Posted in GBA Pro Help on

Hi guys!

I’ve done quite a bit of searching and I think I have a general understanding of the proper installation regarding dealing with condensation, but I was hoping you guys could clarify a couple of things.

A house I’m flipping in South Carolina:

Vaulted ceiling — The roof layers looks like this: decking, then felt, then shingles, then the previous owner installed a metal roof directly on top of the shingles.  The metal is condensating and then dripping down and entering into the roof decking and subsequently the walls at the boot cutouts.  I have no idea what to do here. I’m pretty sure at the least, I have to strip the roof down to the decking.  I’m indifferent between a metal or shingle roof, but it’d be nice to reuse the metal if possible (it can’t be more than 2 or 3 years old and looks great).

I’m sure I’m missing some details, but I’d appreciate some feedback or links to previous articles/discussions I may have missed during my research.

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  1. GBA Editor
    Kiley Jacques | | #1

    Hi Kris,

    I’m going to give your question a bump. Take a look at this detail drawing for an unvented cathedral ceiling assembly in a hot climate, as well as this recent article by Martin Holladay: Five Cathedral Ceilings That Work.

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