Installing Steel Roofing Over Plywood

As long as the plywood under the shingle roof is in good condition this way can provide many benefits.

Installing steel roofing over plywood.

Steel roofing can be costly but it is a lifetime investment. Energy efficient and available in a variety of colors that will. The two main types of substrates used with metal roofing systems are open framing and solid substrates composite or plywood. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal.

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. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. This is by far the most common way to install a metal roof. 16 gauge purlins to secure the metal roof panels.

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. The installation should be reviewed with the metal roofing manufacturer. 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. Noise is usually not a factor if you are installing a steel roof over asphalt.

The open frame substrate uses wood or metal framing members such as bar joists or min. Install waterproof felt over the plywood to add protection against moisture. Yes metal roofs are placed directly to the plywood over icynene insulated roof sheathing thats how i always had it done and warranteed. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels.

But it seems the condensation will affect the 2x4 strapping. 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. Although you can install corrugated metal roofing over shingles for the best foundation it is recommended that all the old roofing be removed. 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.