I am replacing a flat carport roof with PBR metal sheets over 5/8" inch plywood sheathing with underlayment. I know 1/2 inch is strong enough, but I was thinking more of the nailing. Anyway... it's installed.
I plan to install Tyvek 200 underlayment using 3/4" cap nails, and 1-1/2" cap nails where the joists are.
For the PBR I have the same, 1-1/2" metal to wood screws for the joists, and 3/4 for the metal to metal ribs, so I don't see any protrusions there unless I don't hit a joist which is possible.
Since it's a carport, of course when you look up at the bottom, you will see any screws protruding out. There will be quite a few. I guess I could live with them if I had to but I don't really want to.
Question: Is it OK to cut off (either with my cutters or rotary tool) the tips of any protruding screws or nails? Will it hurt the "holding power?"
FYI i am in Los Angeles. We don't get hurricanes etc. I looked at the high wind history for the last 20 years and it never got above 35 MPH.