For my aluminum, I was restricted to 4 x 8 sheets (for the color we wanted), so I have to have some seams on my roof. I am planning on lapping my seams and I am wondering if I have to lap my seams where a spar is located, or will the two layers of .040 aluminum and 1/8" bb give the trim screws enough tooth to hold? I'm leaning towards where a spar is located, but it would be more efficient use of material and less cutting if I do not have to.
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