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Old 10-13-2013, 11:18 AM   #46
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I'm expecting you to find plywood. If it's wood, you're good to go.
Screws hold better. Airspace isn't necessary, but MBCI offers some extended cleats that provide 1/4" to 3/8" airspace. 24 ga. metal is preferred.

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Old 10-13-2013, 12:13 PM   #47
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There is a reason why roofers minimize the amount of cement and caulk they use on installs. Excessive amounts of gunk on a roof traps water and forces it under shingles, creating more leaks. That is why people who attack roof leaks with big mounds of caulk, cement, and tar usually have new leaks develop right after their 'repair' work.
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Old 10-14-2013, 09:51 AM   #48
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Blatant, gross generalizations about which roof system will survive high wind events without even knowing what the substrate, or method of attachment, is kind of ridiculous. Wind resistance is only as good as the weakest link.

If I was to use a metal roof where you are, I would use a batten seam system, so I could remove and replace panels damaged by tree fall. Use a galvanized steel panel with a 70% Polyvinylidene fluoride, or polyvinylidene difluoride (PVDF) paint coating, (Kynar 500, it's like band aid) and use the number of clips recommended by the manufacturer for the anticipated wind speed. The clips should be screwed down with square drive minimum No. 12 fasteners at two per clip into a sound substrate. Follow Tinners advice for spacing, and run panels from eaves to ridge continuous.

Google MetFab A good friend of mine started that company and he knew his chit.
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Old 10-14-2013, 04:28 PM   #49
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met-fab.com ?
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Old 10-14-2013, 08:59 PM   #50
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Originally Posted by paulmars View Post
Yes www.met-fab.com

You can check out their construction details even if you buy from a local provider near you. The key is 24 gage Kynar if steel, .040" if Aluminum. There are a lot of Metal Systems on the market, though.
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Old 10-16-2013, 06:43 PM   #51
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Blatant, gross generalizations about which roof system will survive high wind events without even knowing what the substrate, or method of attachment, is kind of ridiculous. Wind resistance is only as good as the weakest link.
Agreed....I will still take metal over asphalt any day if the substrate is solid.

I love that you are the post police though....
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Old 10-17-2013, 09:32 AM   #52
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Agreed....I will still take metal over asphalt any day if the substrate is solid.

I love that you are the post police though....
Comes from experience. You should see how some of the roofs that I have done forensic work on were fastened down. Clips fastened to 1/2 inch OSB 4 ft. on center with one roofing nail. 24 inch wide panel.

Metal is great as long as the designer and installer know that it moves a lot, and how to handle that movement. Only educated people know how to do that. Again a gross generalization, but I have not met many residential roofers that spend much time in the Library.

Ill turn in my badge.
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Old 10-17-2013, 11:08 PM   #53
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