We'll have two athwartships seams in our roof material - 0.040 anodized aluminum.
I see there have been a number of ways this is done - flat trim and screws - screws without trim - and I think I remember someone using VHB tape without any other fasteners.
That would be my preference if it's doable, and if there were a problem later, I could certainly put a flat-trim over that seam in the future.
The idea would be to install the first piece of exterior, and put a 6" swath of 4200 under the end of that sheet - strap it until set. Then overlap the second sheet, using VHB (and maybe 6" of 4200 to attach to the roof-plywood as well?) Roll the seam to get good contact pressure with the VHB.
Then I'll mask and seal the seam with Lexel or something like that.
I'd appreciate any advice on this plan. Would you put screws along that top-edge of the first sheet? Would you use 4200 to attach the second sheet to the roof plywood? Would you abandon this plan and get some flat trim?
Thanks,
Nate