Oil Canning Decisions

The asphalt shingle roofing on my residence has reached the end of it's usable life & am considering replacing with a low maintenance, well performing, metal roof. This last winter was brutal in CT, we had some roof leaks & ice damming at the eaves. I'd like to install something robust that will perform well over time but am a concerned about oil canning. What are your thoughts on the following options? (Ridge to eave length = 37', roof width = 90', 4/12 pitch) Option A. Standing Seam, double lock, 16" panel width, 24 gauge Galvalume, continuous waterproof membrane & slip sheet Option B. Same as above except, single lock seam + 22 gauge Galvalume, to allow more panel rigidity & free-er movement to mitigate oil canning potential. Is it worth the extra money & labor for this? Option C. Metal shingles. Smaller area less likely to oil can. May be less water tight?		Alex Gil Seam Type & Metal Thickness 5/12/2011	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15889/find/
Alex, thanks for considering metal for your next roof. Your roof design sounds fairly simple and it has adequate pitch for pretty much any metal roof to be installed successfully. I would not get hung up just on the exact details of the product but spend some time making sure you have a good installer and also making sure that the product has a well-backed warranty and a quality coating. Oil canning generally happens because of one of the following: Stresses in the metal Improper forming of the roofing panels Unevenness of the roof deck Improper fastening of the panels Improper fastening clips These things could happen with either Option A or B. The best assurance against oilcanning would be a panel with heavy forming configuration to it. That could include metal shingles. I hope this helps. Todd		Todd Miller Isaiah Industries, Inc. 5/12/2011	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/15890/find/

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