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when installing metal panels over existing shingles, installing wood fir strips seems to be the norm. What I am wondering is here in Miami where we have wicked humidity, and since the metal will "sweat" from condensation...and the wood strips will get wet...isn't there something better to use than fir strips ? Some type of plastic recycled lumber...I know the peak should be vented to allow air to pass under the metal, but I can't help but think that it will sweat anyway
Condensation occurs when warm moist air comes in contact with a cool surface. I say that because, if the temperature on both sides of the metal is the same, condensation can't really occur. I would not use treated lumber. You could switch to plastic lumber if it's okay with your building code but I don't think it's necessary. You also could put the battens up on little feet or something to allow drainage beneath them.
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