metal roofing 5v or 2.5" corrugated?

I drilled and screwed, and calked.

Greg

How large is the roof area in question ?

Using panel goods you will have the same problems eventually...

You should see if any roofing contractors in your area do standing seam metal roofing, almost all the fasteners in such roofing systems are located underneath the roof surface and the roof is held down by clips which hold tight when the standing seam is folded closed... Best thing is that if the contractor does enough of this type of roofing they will have a machine which will take a coil of the metal and form it into the roof allowing for a system with custom length unbroken panels from the eaves to the ridge...

Just an idea, less edges exposed means less leaks, less exposed fasteners means less rust in the future and a longer life for the roof...