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Old 09-20-2013, 11:49 PM   #1
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


Building an attached Pergola patio cover with solid roof onto one-story home (20' x 14' or 280 sqft). Existing roof has shingles, but I was wanting metal on my patio cover for it's longevity. Any options for a metal roof if I stick with a 1/4" slope? I know, I know it's like a flat roof. I don't have height to spare, sorry. Am I correct in thinking modified will run me about the same price as metal, professionally installed?

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Old 09-21-2013, 08:47 AM   #2
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


The only metal that you could use on that slope would be very expensive.
Modified isn't your only option, but its a good one. 3 ply modified is a good roof, in my area tends to last 15ish years, but ive seen quite a few older.
Why don't you gable it off and add slope that way? Tie it in with valleys, have shingles to match the main house. Some of the increased building costs would be offset by the far cheaper roofing.

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Old 09-21-2013, 08:46 PM   #3
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


Need at least a 2 slope for metal roofing.
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Old 09-24-2013, 10:11 PM   #4
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


Unfortunately, I can't Gable our patio due to HOA restrictions.
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Old 09-27-2013, 10:59 AM   #5
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


misshoop -
According to ABQ patio cover requirements, we can do 1/2:12 with metal roofing. That's what I'm doing. According to the builders/roofers I've talked to around here, it's not a problem. Some of the builders might even be able to get 1/4:12 approved, but I'm going for 1/2:12. With 1/4:12 you can use Simpson joist hangers, but at 1/2:12 they're not rated. BTW, I'm planning to use Alvarado Roofing for the roof.
Check your PM.
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Old 09-27-2013, 02:30 PM   #6
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


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Originally Posted by misshoop View Post
Am I correct in thinking modified will run me about the same price as metal, professionally installed?
Heck no, Metal will be 2x to 3x the cost of Modbit. But metal will look 5x better then modbit.

I think MBCI has a SS that can go to .25/12, probably a double lock or field seam type install. I am sure there are more companies if you look, or head over to the MRA website and ask.

sorry my bad .5/12 or greater, the .25 is fugly

From the MBCI site:
BattenLok® HS and SuperLok® must be installed on roof slopes of ½:12 or greater.

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Old 09-27-2013, 03:26 PM   #7
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


Thanks for the replies! Going to with a modbit to keep the 1/4 slope. It should be approved by my HOA, and I can get away with 3.5" step down vs. 6"! Really appreciate the impute!

PS: Anyone good with math and can help me calculating the cuts for my raters?
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Old 09-27-2013, 06:03 PM   #8
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


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PS: Anyone good with math and can help me calculating the cuts for my raters?
End cut 88.8 degrees.
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Old 09-28-2013, 05:12 PM   #9
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


You can use a true single ply also, like EPDM, or a thermoplastic. Some metal roofs can be used as low as 1/4 12, but they all have sealant in the seams. I would not use metal at that low of a slope. A two ply Modified over a glass base sheet would be good, but I would use cold process or hot asphalt at least for the first ply, because of the risk of fire. 1/4 inch in 12 is even low for mod bit because of the overlaps.
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Old 09-28-2013, 07:17 PM   #10
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1/4":12 Slope - Can I go Metal or must I use Modified Bitumen


1/4:12 slope metal roofing is quite common but it's typically mechanically seamed with a higher profile leg. Here's one: http://www.ziprib.com/admin/singlepd...e-June2012.pdf

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