Different methods of rake/gable trim on standing seam?

Hi Arby! Thanks for choosing metal. This is a standard industry gable detail that has been used for years. The screws may loosen a bit over time but they are concealed and I have never seen it be a problem. The biggest concern here really is forcing oilcanning into the panels. You could screw through the fascia but the concern is aesthetics. There are some companies using an F Channel style of gable that does not require fasteners through the metal roof panels. Your panels are pretty long. I'd suggest asking your supplier whether they can provide an F Channel style gable trim.

I'm building my own home, solo. I will be installing a snap-lock standing seam roof. I have a fair bit of experience with metal roofs...but none with standing seam.

I've been watching how-to videos on Youtube and elsewhere....as well as reading the installation instructions from different manufacturers.

Question on the rake/gable trim: In the attached detail for snap-lock standing seam, it shows the "Z" closure held down with screws at 12" o/c. When the rest of the panels are held down with clips, what keeps those screws from backing out under expansion and contraction in a long run of 34'?

Also, to make things easier, could I screw through the flashing into the fascia instead of using the cleats as shown?

I would simply ask the company that is rolling my panels but they haven't an installation manual nor do they seem overly good on answering such questions.

Thanks.

Thanks, Todd.

I had a thought. The last detail I posted doesn't seem to allow for much leeway, or forgiveness, for out of squareness in my roof.

What if I had the trim pieces widened a bit as I have marked in red?