How To Lap A Metal Roof

And for any exposed fasteners try to avoid over tightening them.

How to lap a metal roof.

Space the screws about 12 in 30 cm apart down the entire piece of metal. Because of this you should start at the lowest part of the slope and work upward. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof. Sweep the metal roofing sheets of all dirt and debris with a push broom.

When laying the metal panels on the roof the overlap ridge of the new panel should straddle the underlap ridge of the panel before it. You will use metal roofing screws to secure the metal panels to the sheathing. Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm. Moreover try to ensure that the screws are all aligned evenly.

Place the first screw. 2 lay 6 inch wide butyl tape over all horizontally lapping end seams. When the panel is laying flat on a surface the side that touches flat is the underlap side. This helps to prevent water infiltration.

The opposite end the overlap side will be elevated slightly above the surface. In other words it s put on last the cap to the job. A ridge cap is normally installed only after all metal roof panels and any other trim are in place. Use your neoprene washer head screws to secure the metal to the sheathing.

Take care the first piece is aligned precisely perpendicular square to the edge. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Install the roofing screws vertically along each rib in the panel. Position the tape with the release backing on the top.