Installing Steel Roofing Over Plywood

Although you can install corrugated metal roofing over shingles for the best foundation it is recommended that all the old roofing be removed.

Installing steel roofing over plywood.

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. Galvanized steel which is created by using a soft layer of zinc to protect the inner layers is the most common type of steel roofing. 3 install 1 4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1 4 purlins over the shingle roof. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal.

I have removed all the old shingles from the roof boards not plywood the roof is in great shape and have installed an ice shield over the roof. Before you can install the metal roofing over the protected plywood there are a few more considerations. This step should only be undertaken when you have a good understanding of the process. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels.

For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. Steel roofing can be costly but it is a lifetime investment.

Noise is usually not a factor if you are installing a steel roof over asphalt. You need to make sure the metal panels are square have adequate adherence at the eaves and use the correct kinds of screws. Install waterproof felt over the plywood to add protection against moisture. 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.

But it seems the condensation will affect the 2x4 strapping. To secure it measure it roll it out over the plywood cut it to the dimensions of the roof with a roofing or utility knife and finally hammer it securely to the plywood with 1 2 inch roofing nails. Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Can i install the metal roof over the ice shield or do i need the 1 x 4 battens every 2 feet as well it s a low slope roof thus the ice shield for extra protection.

Install the metal roofing.