How To Install Corrugated Metal Roofing Over Plywood

In this video i m installing some metal roofing over an existing ash fault shingled roof.

How to install corrugated metal roofing over plywood.

This diverts water run off away from the roof boards. In reading online it seems wise to install a vapor barrier over the plywood to prevent condensation from getting adsorbed into the plywood from the steel roof. To install corrugated roofing start by cutting your panels to length with an angle grinder. Then cover the entire roof with a layer of insulation and secure it with a staple gun.

Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Begin installation of panels at the bottom of the roof along the eaves. Steadily work your way up towards the roof ridge. Beginning at the outside edge of your roof place each panel directly onto the purlins that are attached to the roof trusses.

Next pre drill holes on the end and side ridges of the panels spacing the holes 6 to 8 inches apart. If you ve got a pergola attached to your house then you might want to give yourself some extra shelter and protection from the weather simply by installing. Overlap the edge of the roof by 1 inch. Before you install metal roofing repair any damage to the wood under the shingles.

On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. As you place the upper panel over the panel below overlap by 1 inch. Ensure that the line is square with the eave. Install the first row of metal panels so that they overhang the roof by 2 to 4 inches.

Next use 1 inch nails to secure some metal edging to the perimeter of the roof. Install the roofing screws vertically along each rib in the panel. But it seems the condensation will affect the 2x4 strapping. I was planning on putting plywood over the rafters and cross the rafters with a 2 x4 every 16 to secure the metal roof to.

Work toward the ridge. Begin on the left side of the roof working to the right. 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. This is not a complete install only basic install on a bungalow i.