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How much expansion and contraction would occur on a snap lock standing seam roof with a 25 feet 8 inches length panel that is a 24 guage galvalume material. The standing edge is 1.8 inches high. Also would you consider not hemming the panel at the bottom just letting it run over at the drip edge?
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It's hard to give an exact amount that the material would move. It varies in different climates and with different grades of steel. Typically with a panel that long your not going to get a lot of expansion and contraction. As far as the panel at the eave line you don't have to hem it over a a style d type flashing, this operation varies with manufactures. The manufacture I work for has been producing snaplock panels for over 25 years and it's not a requirement on our system. I made a mock up last week using the style d and hem method and liked it myself i think it gives a cleaner look and is probably a good idea in high wind areas.
5/1/2008
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Or copy this URL: https://www.metalroofing.com/spirit/comment/11345/find/Isaiah Industries, Inc.
5/10/2008
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