I have a flat roof - can a metal roof be put on a flat roof?
Guest User
2013-09-05 08:41:32.000000
You can use mechanically seamed standing seam roofs down to pitches even lower than 1:12.
Todd Miller
2012-06-26 12:28:33.000000
Don, virtually all metal roofs can be installed on roofs of 3:12 or greater pitch. Actually most asphalt shingles can be as well. Is there something else unusual about the roof? What sort of climate are you in?
Todd Miller
2013-08-28 21:45:27.000000
Roof pitch is refered to as rise over a run of 12". For example, 3:12 means 3" of vertical rise for every 12" of horizontal run.
There are many metal roofs, virtually all of them, which can be use don roofs of 3:12 or greater pitch. There are some vertical seam roofs that can be used down to 2:12 or even to 1.5:12
On roofs of lower pitch, and even as low as 0.25:12 pitch, you can use metal but it must be a mechanically seamed standing seam.
There are also options in some metals for soldered seams and other hand-crafted products.
Todd Miller
2013-09-05 08:46:52.000000
I am working on a project with a roof slope of 1 in 12, and would like to use standing seam or other metal roofing product. I have seen standing seam on low-slope roofs before, but have read that it usually should not be used on slopes less then 3 in 12.
garth goldstein
2012-06-26 12:10:22.000000
I needed a new roof. I contracted for architectural shingles from a local roofer to replace a deteriorating leaking 8+ yr. old 3 tab asphalt shingle roof. We waited 2 1/2 months for the installation schedule. Today we were to have the roof installed but the roofer phoned and said the roof could not be installed on our 3/12 pitch older manufactured double wide home & attached 2 car garage (total under roof, 26'x84') after all (now he tells me) and suggested raising the roof pitch to 4/12 with new rafters and decking with a 50% increase in cost. He says the 3/12 pitch will not allow the installation of a garrard metal roof or a standing seam metal roof, and his alternative is the only option for our old double wide. Any alternative suggestions ?
Don Schneider
2013-08-28 18:34:01.000000
3:12 is a usual pitch minimum for asphalt.
Mechanical standing seam is good to a 0.5:12 in most cases as Todd mentioned.
Eric Novotny
2012-06-27 22:13:46.000000
+1
You can put asphalt down on a 3:12, you will just need to cover the entire roof is an Ice/Water shield instead of traditional underlayment.
That all being said...If you can go with metal, it does not suffer the same issues at lower slopes that asphalt will.
Asphalt = water shedding
Metal = water proof
Eric Novotny
2013-08-29 11:11:21.000000
Barbara,
The short answer is "yes". What type and application will be required depends on your situation and roof type.
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