Galvanized 5V Crimp roofing screw placement with battens/counterbattens

Question

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:

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

Kerry Thomas · Answer

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.

Galvanized 5V Crimp roofing screw placement with battens/counterbattens

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