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-   -   1/4":12 Slope - Can I go Metal or must I use Modified Bitumen (http://www.diychatroom.com/f9/1-4-12-slope-can-i-go-metal-must-i-use-modified-bitumen-187353/)

misshoop 09-20-2013 11:49 PM

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?

PatChap 09-21-2013 08:47 AM

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.

joecaption 09-21-2013 08:46 PM

Need at least a 2 slope for metal roofing.

misshoop 09-24-2013 10:11 PM

Thank you for the replies
 
Unfortunately, I can't Gable our patio due to HOA restrictions. :no:

garya505 09-27-2013 10:59 AM

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.

AndyWRS 09-27-2013 02:30 PM

Quote:

Originally Posted by misshoop (Post 1244452)
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.

misshoop 09-27-2013 03:26 PM

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?

123pugsy 09-27-2013 06:03 PM

Quote:

Originally Posted by misshoop (Post 1247119)

PS: Anyone good with math and can help me calculating the cuts for my raters?

End cut 88.8 degrees.

jagans 09-28-2013 05:12 PM

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.

rustyjames 09-28-2013 07:17 PM

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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