How To Install Dormer Valley For Corrugated Metal Roof

Use tape sealant between the valley trim and the panel.

How to install dormer valley for corrugated metal roof.

Secure the sheets into place with screws. Take care the first piece is aligned precisely perpendicular square to the edge. I have my valley custom made with water trough to help with leaking b. The top joinery of both valleys when they meet on the same plane of roof is shown here.

Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart. How to measure and cut the metal on a valley for metal roof install. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch. 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.

To install corrugated roofing start by cutting your panels to length with an angle grinder. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses. Fold the top of the flashing over the ridge. Once the first sheet is in place you need to install the remainder of the lowest row of corrugated metal roofing.

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. Cut the bottom edge and fold it down over the drip edge. Use your neoprene washer head screws to secure the metal to the sheathing. Steep slope roofs slope greater than 3 12 cut the panels at an angle for the valley then bend the hem end of the panel and hook it with a cleat.

Use fasteners to attach the panel to the structure making sure that there is complete compression of the sealant. 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. Make sure to cover the gap at the bottom of the raised ridge. Space the screws about 12 in 30 cm apart down the entire piece of metal.