How To Lap A Metal Roof

Place the first screw.

How to lap a metal roof.

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. 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. This helps to prevent water infiltration. The opposite end the overlap side will be elevated slightly above the surface.

Install the roofing screws vertically along each rib in the panel. Take care the first piece is aligned precisely perpendicular square to the edge. And for any exposed fasteners try to avoid over tightening them. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Try to space the screws about 12 inches apart down the entire piece of metal. 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. 2 lay 6 inch wide butyl tape over all horizontally lapping end seams. Sweep the metal roofing sheets of all dirt and debris with a push broom.

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. Use your neoprene washer head screws to secure the metal to the sheathing. You will use metal roofing screws to secure the metal panels to the sheathing. Space the screws about 12 in 30 cm apart down the entire piece of metal.

When the panel is laying flat on a surface the side that touches flat is the underlap side. Moreover try to ensure that the screws are all aligned evenly. 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.