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I have gotten conflicting information from salesmen. Background: I have a seasonal cottage about 150 feet from the ocean in Maine with a roof slope of 7/12. From reading your forum comments - my only metal choice would be aluminum given the closeness to the ocean and having a warranty. My questions: 1) given thermal expansion issues with aluminum and my location in Maine/seasonal cottage does an aluminum roof make sense? 2) I have received conflicting recommendations for aluminum salesmen for shingles vs standing seam. The shingle guy says I should not consider standing seam given thermal expansion and oil canning risk. The standing seam guy says I should not consider shingles given risk of water damage from driving rain and a relatively low pitch roof. Are they both right and I should just stick with asphalt?
10/7/2023
Or copy this URL: https://www.metalroofing.com/spirit/comment/26383/find/I would recommend aluminum due to the corrosive environment. Clip-fastened standing seam as well as any aluminum shingle have adequate allowance for thermal movement of the metal. Standing seam of all types always runs some risk of oilcanning. Striations in the panels help. It also can help to use something called backer rod between the panels or an entangled mesh product such as Dry-Tech and others. 7:12 really is not a low pitch. Most aluminum shingles have been tested and approved by their manufacturers and also have installation supported by building codes on roof pitches of 3:12 or 4:12 or greater. I feel you're safe either way. Aesthetics may guide your decision. If there is anything of concern about the design of your house or geometry of your roof, I am happy to take a look at those things. I can be reached at [email protected]
Isaiah Industries, Inc.
10/7/2023
Or copy this URL: https://www.metalroofing.com/spirit/comment/26384/find/