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I am building a porch roof over an existing patio. I am not planning on enclosing the porch. The rafters are fabricated I-beams. I plan on putting aluminum soffit under the I-beams. On top of the roof I would like to put down a metal roof. I already put down 3/4" OSB and a rain/ice barrier. Do I need insulation and/or ventilation on top of the rain and ice barrier, or can I get away without it? Won't the temperature changes cause a moisture problem on the underside of the metal roof?
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The correct place to insulate in this case, if you wish, would be in the enclosed "attic" cavity but as long as you are venting this area you should be fine.
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Thanks for the reply Todd. I plan on having a small area of vented soffit at the low end of the porch roof. The side at the house can't really be vented (It is lagged into the house at the ledger board).
I take from your response that I can just lay down the OSB, ice & rain barrier, then the metal roof. Should I leave the ends of the seams open for some air to get between the ice & rain barrier and the metal roof? ...or won't I have any troubles with moisture between the steel and the barrier?
4/8/2008
Or copy this URL: https://www.metalroofing.com/spirit/comment/11214/find/Isaiah Industries, Inc.
4/8/2008
Or copy this URL: https://www.metalroofing.com/spirit/comment/11215/find/4/8/2008
Or copy this URL: https://www.metalroofing.com/spirit/comment/11216/find/Isaiah Industries, Inc.
4/27/2008
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