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Thread: Minimum slope for metal roof
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10-11-2011, 12:53 PM #1
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Minimum slope for metal roof
Came across this metal roof over a deck today. Metal roof does not contact gable roof of manufactured home, but I am wondering if that changes the requirement for minimum slope. Also what is the minimum slope for a metal roof?
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10-11-2011, 01:20 PM #2
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Re: Minimum slope for metal roof
Realistically, any more than 1/4" per foot would okay at all but the most windy times. Since it's just over a deck if it had at least that much I probably wouldn't comment. I've built many of those patio covers over the years (it rains a lot in Oregon
) and they've been fine. Realistically, I slope them more than the bare minimum.
As for the bare minimum for a metal roof over a house, I'm not sure but I'd bet someone here will know. A standard standing seam metal roof would have to be good down to at least 2:12 I'd think.
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10-11-2011, 02:48 PM #3
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Re: Minimum slope for metal roof
this site is a good source for many roof covering types
Metal panel roof systems for low-slope applications | NRCA National Roofing Contractors Association
badair http://www.adairinspection.com Garland, TX 75042
Commercial-Residential-Construction-EIFS-Stucco-ACMV-Infrared Thermography
life is the random lottery of events followed by numerous narrow escapes...accept the good
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10-11-2011, 06:39 PM #4
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Re: Minimum slope for metal roof
Most metal roof panels call for a minimum 4/12 slope.
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10-11-2011, 06:51 PM #5
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Re: Minimum slope for metal roof
Most any type of roof covering,recommends a 4/12 pitch,in order to be effective.
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10-24-2011, 07:05 AM #6
W. Craig McDougald Guest Re: Minimum slope for metal roof
While I was a commercial roof estimator, I saw specifications for metal roofs with slopes as low as 3/8" per foot, approved by the Manufacturer.
Mueller currently accepts 1/2"/12 for "R" panels and 1"/12 for "U" panels, one layer underlayment; no underlayment on lath.
Their CF panel ("snap-lock" type Standing seam) and AP panel both require 3/12, same underlayment requirements as above.
Mueller, Inc. - Downloads
Hope this helps
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