Panel width and oil canning: "We are considering a standing seam metal roof for our ..." - Guest User (10/25/2004) | Roofing over existing roof | Archive

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We are considering a standing seam metal roof for our vacation home in Vermont. The present roof is made of cedar shakes/shingles and is about 20 years old. One contractor told us we had to remove the old roof to check for moisture damage, etc. Another told us he would go right over the old roof. Any thoughts? Also, one contractor suggested 21" panel width as that is what he normally uses. It seems a bit wide to me. What is "normal?" Are wider panels more prone to oil can, "waves," imperfections, etc?		Guest User 10/25/2004	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/4468/find/
Panel width "can" be a factor in oilcanning but there are ways to attempt to compensate for wide panels -- things like metal thickness, embossing the metal, putting in strengthening ribs, etc. Oilcanning has numerous potential causes. I would suggest reading the MCA Technical Bulletin on this subject which can be found at: http://www.metalconstruction.org/pubs/pdf/95-1060%20MCAoilcanning.pdf		Guest User 10/27/2004	Share Or copy this URL: https://www.metalroofing.com/spirit/comment/4469/find/