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Minimum Pitch For Metal Roofing

 
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Old 11-20-2015, 06:00 AM   #41
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Re: Minimum Pitch For Metal Roofing


I've enjoyed reading this thread no matter when it was posted. Have to put a roof on a porch that is 1:12 pitch. Actually roofing the whole thing the other sections are a better pitch but about 1/2 way down the front the 1:12 porch connects in. We wanted to put metal on this roof but I've heard so many things about the low pitch and using this or that material. We do have a lot of wind here. We are on a hill that goes down to a river on one side and a creek on the other and the winds can get pretty high at times. In fact it pulled our tarp off during some severe weather and we got pretty wet. I can have the metal fabricated for me - there are actually two metal roofing places near here where I can buy residential roofing material. I don't know any place that does the sealed seams but I 'm pretty sure I can get the butyl tape from somewhere. Anyway thanks for posting I wish some of you were closer to my area I'd call you up for a bid to get us in the dry faster.
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Old 11-22-2015, 08:03 AM   #42
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Re: Minimum Pitch For Metal Roofing


I read the first page and then skipped to the end. So I apologize if this has been covered. It is common to have a 1/12 pitch on steel buildings. We have also done a ton of storage buildings with a 1/2 - 12 pitch. The steel just bends over the ridge. We use butyl (sp) tape on all the seams and stitch screws. This is your standard steel panels.

For standing seam, I wouldn't think it would be much different. The standing seam I've installed has a rope of butyl caulk, pre-installed in the hook. I've personally only done down to a 1/12 pitch with standing seam. We did have one roof that required a 3 1/2" tall rib. The engineer determined, that with a heavy rain, there could be 3" of water at the eaves. It was 90' from ridge to eave.
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Old 11-23-2015, 12:32 PM   #43
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Re: Minimum Pitch For Metal Roofing


Residential ...Where i am at, the inspector will ask for specs from the metal manufacturer. Most say 3/12 in specs. After that you will need a letter from manufacturer as to the lowest slope their product can be installed at and additional steps to take if necessary. That usually just entails a line of Tacky tape / Butyl caulk tape. at the seems.

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Old 11-27-2015, 06:45 AM   #44
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Re: Minimum Pitch For Metal Roofing


Do you feel that there is an advantage to the painted metal versus the galvalume (silver oil finished) Mostly longevity is the concern one versus the other but wondering about fading and staining from abundant oak trees.
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Old 12-01-2015, 09:07 AM   #45
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Re: Minimum Pitch For Metal Roofing


One other question. The sheathing on the roof on the old house is 1/2" plywood. The house being repaired is 40 + years. Loads of decking was replaced on the front but some old decking remains. I felt it was important to add the lathe strips prior to screwing on the decking because of consistent high winds in this location. Is that preferred or would using screws on the 1/2 plywood be adequate? (I found the painted metal had longer life listed by the manufacturer)
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Old 12-01-2015, 09:44 AM   #46
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by maggie b View Post
Do you feel that there is an advantage to the painted metal versus the galvalume (silver oil finished) Mostly longevity is the concern one versus the other but wondering about fading and staining from abundant oak trees.
As long as you go with a Kynar coated metal and not that SMP ****, you should be fine.

Firestone's Paint finish warranty is 35 years for adhesion, between 20 & 30 years for chalking, and 20-30 years for fade as well. The differences depend on color chosen.

Berridge Paint finish warranty is 20 years across the board for adhesion, fade, and chalking.

Drexel's warranty is 35yrs across the board.

As far as minimum roof pitch, alot of it is manufacturer/profile contingent.

Drexel has profiles that they warranty down to 1/2:12, some at 2:12, some at 3/12

The others are the same.

Those are the three companies we deal with the most.

/EDIT: We have never done a fab job for a galvalume roof, but I just looked at Firestones galvalume(they call acrulyme) warranty and it is 20.

Last edited by MetalStretcher; 12-01-2015 at 09:50 AM. Reason: quoted wrong post
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Old 06-19-2016, 05:57 AM   #47
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Re: Minimum Pitch For Metal Roofing


The performance capabilities of any metal roofing system increases in steep-slope applications. Steep slope allows for escape of the moisture easily. Accurate slope for metal roofing system is in excess 2 1/2:12 though it may vary according to the system manufacturers permit applications on slopes of at least 1/4:12. Hope it helps.
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Old 10-29-2016, 04:46 AM   #48
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Re: Minimum Pitch For Metal Roofing


Whatever you're willing to guarantee!

Robert Beyette.
Beyette Roofing'Inc.

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