Roofing Screws In The Ridge Or Flat

The main cause of a leaking roof on a diy metal roofing installation is incorrectly fastening the screws.

Roofing screws in the ridge or flat.

Place large tab closure between the ridge cap and the roof panels. 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. Having done several metal roofs since then i would say if you are an amateur screw on the flat with 1 1 2 screws. Metal moves some heat cold expansion and makes a bigger hole in metal for a leak.

250 brown 12 x 1 1 2 hex regrip sheet metal roof screw. Make sure and not get them too tight don t squish the rubber gasket just nice and snug. Ridge cap should be end lapped 6 inches at each end. If the screws are driven correctly fastening through either the valleys or the ridges of the roofing is considered acceptable in this country.

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. Quite often the screws are over tightened or under tightened and when this happens it creates leak points. 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.

Make sure to screw through closures. Your roof will have thousands of screw holes. Screws in the flat nails on the ridge. Sharp point metal to wood siding screws.

Attach ridge cap to rib of roof panel with screws on every rib along both sides of rib. I strap all roofs with nothing less than 2 4 to help lock that roof in place. As the screws are driven the washer presses against the metal roofing to form a water proof seal.