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MatthewG
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# Posted: 30 Sep 2021 08:48pm
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I just added an 8’x20’ deck onto a cabin I just moved. Originally it had a smaller deck with a metal roof, metal was screwed directly to rafters without any insulation or underlayment. Owner screwed stained 1x10 pine to bottoms of rafters as a ceiling/bird blocking. It is 6 years old and didn’t show signs of condensation drips on rafters, probably from the pine ceiling which insulated it somewhat. I’m not wanting to use 1x10’s as a ceiling on deck and leave it open but am concerned with condensation drips if I don’t insulate....but all the fanfold and 4x8 insulation panels I can find have writing/logo’s on underside. Options that I can think of are 1) use synthetic roof underlayment it’s black underneath 2) skip the insulation and put up with drips 3) buy more pine and install a ceiling 4) open to suggestions! Thanks from central Illinois
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Bruces
Member
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# Posted: 30 Sep 2021 09:10pm
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I have an exposed metal roof on my 10x24’ deck and there is no condensation at all .Unless you heat the deck ,you will be just fine .
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Grizzlyman
Member
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# Posted: 30 Sep 2021 11:26pm - Edited by: Grizzlyman
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Condensation needs differing Temps to form. Open is just fine. Think about all the farm buildings with just wood frames and steel.
Hope this helps!
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Alaskajohn
Member
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# Posted: 1 Oct 2021 10:35am
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Nice deck! Enjoy it! 
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snobdds
Member
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# Posted: 1 Oct 2021 10:57am
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If the underside of the deck and the top side of the roof are the same temperature, there can be no condensation.
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NorthRick
Member
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# Posted: 1 Oct 2021 02:46pm
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You very much can get condensation on the underside of the metal roof over an otherwise open deck. I know, as it happened to mine just the other weekend. Doesn't happen a lot, and it's not enough water dripping off of it for me to worry about, but it does happen.
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Brettny
Member
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# Posted: 1 Oct 2021 03:46pm
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It can happen but dosnt really matter because the underside is open to the breeze and general outside.
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toyota_mdt_tech
Member
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# Posted: 4 Oct 2021 07:56am
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With roughly same temps topside vs underside and the open porch, moving air, should be a non issue.
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