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I am installing 5V crimp roofing over an addition to my small house. The additions's roof joins the house under a 14" eave. The main house slope is 5/12 or about 22.5 deg. The addition slope is 10 deg.

On the addition, the rafters are 16in o/c, and the roof deck is 7/16 OSB, with GAF synthetic felt.

My plan is to install 1x4 battens running up slope, and above that, run 2x4 counterbattens. The metal will screw to the counter battens using rubber-washer screws for this purpose. The metal is coming from Lowes and I do not know the manufacturer. However many manufacturers specify putting screws in the "peaks" and also , alternatively, putting them in the "flats" between the V's. There will be a vertical lap about 16" up from the bottom edge of the roof. Of course, I will order rake trim to run down the left and right edges.

The home is located in far north central Texas.

MY QUESTIONS:

  1. Is this slope really too low for 5V Crimp?
  2. Is it better to install the screws in the "peaks" or the "flats"?

5v cross section enter image description here enter image description here enter image description here

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    If 1 and 2 are really your only two questions, those will be found in the installation manual from the metal supplier. They will have a screw location guide based on the wind speed in your area and will also specify the minimum slope allowed. I think many metal roofs are ok even on a 2/12 slope, maybe even 1/12, but the manual will tell you for sure. – JPhi1618 Nov 15 '19 at 19:07
  • Well, that's just it ... I don't know the manufacturer. However ... I have talked to a couple of folks, and it seems that 5V crimp is the wrong tool for this job, due to the slope. I am going to look hard at standing seam, perhaps without attaching to battens and going straight to the roof deck – Kerry Thomas Nov 15 '19 at 22:40
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    You can't go wrong with standing seam...IF you can afford it. I put a 5-V over my back porch and had no issues for over 15 years... however, it my case, it was not critical there be no leaks. I put the fasteners on the V-s--which I believe is the proper location. Much less rain surface for a potential leak to develop if you think about it. I am curious as to why you covered the battens with OSB. ..seems an unnecessary expense to me. I had no decking in my case--just battens. – peinal Nov 15 '19 at 22:49
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    Are you in an area that gets snow? I’ve just never heard of that slope being a problem, but I’ve never lived in a snow area. – JPhi1618 Nov 16 '19 at 1:19
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    I have seen a few leak issues with 5v and would go with standing seam. But I am in Oregon and we do get a lot of rain here the pitch should be fine though. – Ed Beal Nov 16 '19 at 15:49
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I have decided to go in a different direction... I will be using standing seam metal from McElroy:

https://www.mcelroymetal.com/standing-seam-systems/medallion-lok

This offers a 1 3/4" high channel, and all hidden fasteners. I simply cannot believe that water will run over that high of a wall over 9 feet run, even in the most brutal rainstorm, and even with a 2-slope.

Snow is minimal here, we rarely get more than about an inch or so. Even then I can just get up on a ladder and sweep it (not getting on the slick wet roof of course!)

Thanks to everyone for their comments and guidance.

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