Installing Steel Roofing Over Plywood

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.

Installing steel roofing over plywood. Work at a comfortable steady pace trying not to rip up or carry off too much old roofing at once. Although you can install corrugated metal roofing over shingles for the best foundation it is recommended that all the old roofing be removed. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Energy efficient and available in a variety of colors that will.

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. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. 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. The installation should be reviewed with the metal roofing manufacturer.

Yes metal roofs are placed directly to the plywood over icynene insulated roof sheathing thats how i always had it done and warranteed. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. The two main types of substrates used with metal roofing systems are open framing and solid substrates composite or plywood. The open frame substrate uses wood or metal framing members such as bar joists or min.

This is by far the most common way to install a metal roof. But it seems the condensation will affect the 2x4 strapping. 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. Install waterproof felt over the plywood to add protection against moisture.

On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. Noise is usually not a factor if you are installing a steel roof over asphalt. 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. 16 gauge purlins to secure the metal roof panels.