How To Lap A Metal Roof

You will use metal roofing screws to secure the metal panels to the sheathing.

How to lap a metal roof. 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. In other words it s put on last the cap to the job. Because of this you should start at the lowest part of the slope and work upward. Install the roofing screws vertically along each rib in the panel.

How to lap metal roofing a basic rule of thumb for installing metal roofing is that the piece of roofing higher up on the slope should always overlap the one below it. Metal roofing ridge cap is the trim placed along the roof s ridge the peak where two roof slopes meet up. This helps to prevent water infiltration. And for any exposed fasteners try to avoid over tightening them.

Use your neoprene washer head screws to secure the metal to the sheathing. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. 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. Try to space the screws about 12 inches apart down the entire piece of metal.

A ridge cap is normally installed only after all metal roof panels and any other trim are in place. Space the screws about 12 in 30 cm apart down the entire piece of metal. Moreover try to ensure that the screws are all aligned evenly. 2 lay 6 inch wide butyl tape over all horizontally lapping end seams.

Take care the first piece is aligned precisely perpendicular square to the edge. Position the tape with the release backing on the top. Place the first screw. 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.