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Minimum Pitch For Metal Roofing

 
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Old 02-08-2006, 11:08 PM   #21
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Re: Minimum Pitch For Metal Roofing


there is a laptape to use on your seams . anything under a 2/12. the tape is like a puddy in a roll you roll out on the rib and the other piece seals out the weather when overlapped
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Old 02-09-2006, 12:07 AM   #22
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by benchmark2323
there is a laptape to use on your seams . anything under a 2/12. the tape is like a puddy in a roll you roll out on the rib and the other piece seals out the weather when overlapped
We call that panlastic tape, that is good stuff run that out then a bid of np 1 on top of that, that is what you call a sure-seal, just make sure you panel is right on, i hate pulling that stuff up especially when it is hot out.

Last edited by Snl; 02-09-2006 at 12:09 AM.
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Old 02-10-2006, 09:07 AM   #23
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Re: Minimum Pitch For Metal Roofing


Low sloped metal roof systems go down to 1/4:12'. These systems are usually structural and include butyl tape at the seams. Architectural (residential) metal roofing is usually limited to 3:12. Call your metal mfr to get the exact data for each metal system.
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Old 08-20-2011, 02:48 PM   #24
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Re: Minimum Pitch For Metal Roofing


Specifically-Minimum slope for "classic rib" exposed fastener metal roof?
I can look up the manufacturer's figure-3/12,
I can ask a sales rep-1/12,
I can ask the counterman-"Weeelllll, you praaabbly can do awwwriiight if'n you do...
I can go online and see 1/4-12 for metal roof systems
I have roofed everything else on my home with Arctic White Classic Rib 29 gauge metal. I left all the existing shingles on and installed 1 x 4's as perlans for mounting the classic rib metal.
So what's left is the dormer roof and it starts on the back of my ridge and is 38' wide by 16' deep. It has an actual pitch of 1.8/12. I've repaired all bad decking and for underlayment have used ice and water guard (peel and stick).

I plan to put down 1 x 4's perpendicular to "classic rib" metal sheets for roofing. As you know these are screwed down with neoprene washered screws.
I also plan to put that gummy roll stuff on the overlayed seams of the classic ribs and at the rake trim.

Do any experienced metal roofing guys here see a problem with this plan?
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Old 08-20-2011, 06:31 PM   #25
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Re: Minimum Pitch For Metal Roofing


Maybe seeyou will be along here shortly and set ya'll straight. At least for inland roofing, I would consider him the guru.
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Old 08-20-2011, 07:23 PM   #26
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Re: Minimum Pitch For Metal Roofing


Good I need the input.

Last edited by artgineer; 08-20-2011 at 07:28 PM.
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Old 08-20-2011, 08:49 PM   #27
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by artgineer View Post
Specifically-Minimum slope for "classic rib" exposed fastener metal roof?
I can look up the manufacturer's figure-3/12,
I can ask a sales rep-1/12,
I can ask the counterman-"Weeelllll, you praaabbly can do awwwriiight if'n you do...
I can go online and see 1/4-12 for metal roof systems
I have roofed everything else on my home with Arctic White Classic Rib 29 gauge metal. I left all the existing shingles on and installed 1 x 4's as perlans for mounting the classic rib metal.
So what's left is the dormer roof and it starts on the back of my ridge and is 38' wide by 16' deep. It has an actual pitch of 1.8/12. I've repaired all bad decking and for underlayment have used ice and water guard (peel and stick).

I plan to put down 1 x 4's perpendicular to "classic rib" metal sheets for roofing. As you know these are screwed down with neoprene washered screws.
I also plan to put that gummy roll stuff on the overlayed seams of the classic ribs and at the rake trim.

Do any experienced metal roofing guys here see a problem with this plan?
You are responding to a five and one-half year old thread.
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Old 08-20-2011, 08:50 PM   #28
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by artgineer View Post
Specifically-Minimum slope for "classic rib" exposed fastener metal roof?
I can look up the manufacturer's figure-3/12,
I can ask a sales rep-1/12,
I can ask the counterman-"Weeelllll, you praaabbly can do awwwriiight if'n you do...
I can go online and see 1/4-12 for metal roof systems
I have roofed everything else on my home with Arctic White Classic Rib 29 gauge metal. I left all the existing shingles on and installed 1 x 4's as perlans for mounting the classic rib metal.
So what's left is the dormer roof and it starts on the back of my ridge and is 38' wide by 16' deep. It has an actual pitch of 1.8/12. I've repaired all bad decking and for underlayment have used ice and water guard (peel and stick).

I plan to put down 1 x 4's perpendicular to "classic rib" metal sheets for roofing. As you know these are screwed down with neoprene washered screws.
I also plan to put that gummy roll stuff on the overlayed seams of the classic ribs and at the rake trim.

Do any experienced metal roofing guys here see a problem with this plan?
No problem, sounds like you have it down. And, so you know, you can run butyl tape on classic pro 9 inch low rib, and install it on a flat roof. As with all exposed fastener systems, care must be used when driving the screws, and it will be fine.
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Old 08-20-2011, 09:25 PM   #29
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Re: Minimum Pitch For Metal Roofing


Thank you joasis, that's one for "go ahead" and I'm watching the screwing.
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Old 08-20-2011, 09:31 PM   #30
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by Jess View Post
Last year I did (as GC) a 30,000 sf superstore roof that was an Ultradeck Standing Seam on a 1/4 in 12 pitch. I'm now doing a 12,000 sf single slope office with 1/12 pitch. the owner would like the canopy to have a tile roof look, out of metal - anyone out there have budget pricing info for this product? How about you Teetorbilt - using this product at the beach?????????
Something like this?



I'd say at least $950-1000 / sq ... that's what we charged for this 4 years ago and it "felt" a bit on the low side for the amount of work... these panels are a pain in the @$$ to install and cost about $450+ / sq ... lat time i checked at least, which was a while back.

As far as minimum pitch - Firestone makes architectural standing seam (snap lock with concealed fasteners) for 1 in 12 pitch - it has a sealant in each lock.

Other than that - most typical metal roofs are 3in12 or 4 in 12 pitch minimum - you need to look it up for every specific product. Moat will be 3 pitch.
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Old 08-20-2011, 09:34 PM   #31
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Re: Minimum Pitch For Metal Roofing


most manufactures can inject the seams
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Old 08-21-2011, 06:11 AM   #32
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Re: Minimum Pitch For Metal Roofing


Hi JPROOFER

I have only just joined the forum and not sure of your question is still current

However, we have metals rooves that will go to 1 degree in the UK, I would be surprised if similar is not available on your side of the pond

DHA

( sorry we Brits use angles not bevels any more :-) )

Last edited by D.H.A.; 08-21-2011 at 06:23 AM.
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Old 08-21-2011, 08:58 AM   #33
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Re: Minimum Pitch For Metal Roofing


Hi D.H.A., Welcome to this neck of the woods. The question was asked 5 years ago as anti-wingnut pointed out but it is still a current and relevant question. In my post I needed to re-invigorate the thread because I need an experiential answer. People who have done what I propose with success or failure so I know how much of a chance I'm taking or not.
I don't care about standing seam-I'm doing "36 inch wide Classic Rib" with exposed neoprene washered screws and my pitch is 2/12.
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Old 08-21-2011, 09:09 AM   #34
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Re: Minimum Pitch For Metal Roofing


Exposed fastner metal (29 ga. )lower than 3/12 should seal the lap to help with against water "wicking " up under the lap. Major western Canada ag. building manufacture of post frame buildings ( Goodon Industries) here uses 3 & 1/2 / 12 . Rafters strapped , 2 x 6 .
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Old 08-21-2011, 11:00 AM   #35
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Re: Minimum Pitch For Metal Roofing


Thanks Artworks, I'm planning on using the narrow seal tape that I get from Max Kendall Lumber and Tin for 2.55 (25' roll) under the lap.
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Old 08-21-2011, 04:22 PM   #36
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Re: Minimum Pitch For Metal Roofing


Most metal roofing suppliers allow for a 3/12 pitch. Depends on the mfg., some allow to a 1/4" to 12" rise. I mostly use Metal Sales and Met tile. All roofing suppliers should tell you what they recommend. Also most code departments will accept the mfg. recommended pitch. The roof in the picture looks like about a 10 to 12 pitch. With that much pitch the rain water will run off very fast and possibly tear the gutter system off the fascia board. Watch for that to happen. Hope this helps.
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Old 08-21-2011, 06:48 PM   #37
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Re: Minimum Pitch For Metal Roofing


the "sticky tape" that goes on the seams is known as butyl tape. i agree with joasis put the butyl tape on the seams and watch the screwing and you should be good.
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Old 08-21-2011, 06:49 PM   #38
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Re: Minimum Pitch For Metal Roofing


Thanks for your input J! That's two for "go ahead".
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Old 08-21-2011, 10:42 PM   #39
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Re: Minimum Pitch For Metal Roofing


Quote:
Originally Posted by catfish View Post
Maybe seeyou will be along here shortly and set ya'll straight. At least for inland roofing, I would consider him the guru.
I've never installed an exposed fastener roof on anything but barns. Most of my experience is with brake formed roofing, but when installing a system manufactured by others, I adhere to the manufacturer's instructions.
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Old 08-22-2011, 08:45 AM   #40
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Re: Minimum Pitch For Metal Roofing


Thanks seeyou.

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