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I'm in final phases of design for my own home which I also plan to build myself. The roof is a series of shed roofs with 2:12 pitches.
The roof will be standing seam...but I prefer one that doesn't require mechanical fastening. I believe that leaves me with two choices: The type of panels that snap over a hook that is attached to the substrate separately or....the type of panel that is screwed down with the neighboring panel covering these screws, like the panel in the attached image.
With the latter style, my concern was the screws backing out due to contraction and expansion...like they do on exposed fastener roofs. I was also concerned with their dryness on a 2:12 pitch.
I spoke with two different companies who manufacture that latter style and both told me they had not heard of the fasteners backing out. They also both told me a 2:12 pitch was not a problem. The one guy told me they install the same roof on 2:12 and lower pitches often and have never had leakage issues.
What are the opinions of those here?
The two panel types you mention are generally called "clip fastened" and "nail hem" (though no one would use nails -- lol). I think both would work well for you. The key to watertightness is the male seam height. The higher the seam / rub, the more watertight. Nail hem panels generally are not recommended for lengths over 25' due to thermal movement. Of course, the longer the panel lengths, too, the more water the panels must carry. You also can consider whether any higher level roofs will shed water on lower roofs, increasing the amount of water flowing down the panels.
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