I strap all roofs with nothing less than 2 4 to help lock that roof in place.
Roofing screws in the ridge or flat.
4 6 out of 5 stars 10.
250 brown 12 x 1 1 2 hex regrip sheet metal roof screw.
The idea being that the longer screws in the valley hold the sheet down and the shorter screws on the ridges keep the wind from picking up the sheet.
As the screws are driven the washer presses against the metal roofing to form a water proof seal.
On the ridges can distort the metal.
Quite often the screws are over tightened or under tightened and when this happens it creates leak points.
Valid arguments can be made for both preferences.
Attach ridge cap to rib of roof panel with screws on every rib along both sides of rib.
Screws in the flat nails on the ridge.
Screwing high on the rib is difficult for the amateur.
Screwing or fastening down a metal roof is one of the easiest parts of a metal roofing installation but it s also the most problematic.
Place large tab closure between the ridge cap and the roof panels.
Having done several metal roofs since then i would say if you are an amateur screw on the flat with 1 1 2 screws.
Make sure to screw through closures.
Metal moves some heat cold expansion and makes a bigger hole in metal for a leak.
The manufacturers recommend screws in the valley 3 per perling and shorter screws spaced 18 to 24 inches depends on the manufacturer on the ridges.
Ridge cap should be end lapped 6 inches at each end.
Sharp point metal to wood siding screws.
Make sure and not get them too tight don t squish the rubber gasket just nice and snug.