How To Overlap Corrugated Metal Roofing

When the panel is laying flat on a surface the side that touches flat is the underlap side.

How to overlap corrugated metal roofing.

Circular saw 2 x research source slower than angle grinder but follow same step 2 pre drill holes on the ridges. The opposite end the overlap side will be elevated slightly above the surface. Allow for a minimum of 18 inches 46 cm if you need to lap to complete the run. Then situate the leading edge of the first panel along this line.

Step 1 cut the panels to the desired length. 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. On the eave side of the roof aim to overhang the panels by 1 to 1 5 inches. If you re installing a metal roof on a home without gutters you can overhang the panels by twice that amount.

Most panels come up to 32 feet 9 8 m in length. Make sure the panel is square to the roof line. Position the tape with the release backing on the top side. Place the next row of corrugated metal roofing so that the bottom of it is over the top of the first row.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Lay 3 inch wide butyl tape over all vertical metal panel seams. The sheets should overlap by at least four inches add a bead of caulk where they overlap and at the other end of the building ensure there s an overhang of two inches. Paint or prime cut edges to prevent rust.

Angle grinder 1 x research source the fastest option. 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 line. Peel back the release backing to start the application. Some panels have pre drilled holes.

Install the roofing screws vertically along each rib in the panel. Continue onto the next rows. If yours do not.