Rusty Galahume metal roof question.

Robert in Md · Oct 30, 2008

I have a machine shed that I built in 1986 about 36 X 60. The front is all sliding doors that stay open most of the year. The roof has started rusting just over the rafters. A strip of rust about 3-4 inches wide above each rafter. The rafters and lathes are pine with 15 lb felt under the metal . Why is the rust just over the rafter???? Thanks

Ron Anderson · Oct 30, 2008

My guess is moisture related being it is where the rafters are. You can paint it with Rusty Iron Primer that will stop the rust.

Marv · Oct 30, 2008

Had the same thing happen to me. Don't know why. But I replaced it with painted tin. I put bubble pack between the rafters and tin. No more rusting....yet.

I think galvalume is overrated and over priced.

Ed n Northern Va · Oct 31, 2008

The metal above the rafters stays cooler than the open areas with unimpeded air flow, encouraging condensation to collect (and dry off more slowly). This erodes the zinc coating on your galvalume roof more quickly.

Rusty Galahume metal roof question.

Robert in Md

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Ron Anderson

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Marv

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Ed n Northern Va

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