Metal Roofing Directly Over Plywood

This product is generally used in hot roof low slope applications with aluminum roofing.

Metal roofing directly over plywood.

See the image below. 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. 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. 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.

Energy efficient and available in a variety of colors that will add value to your home metal roofing is a wise choice for homeowners. When using plywood nail it directly to the purlins and screw the metal roofing panels through the plywood into the purlins as instructed by the manufacturer. Video of the day. 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. Complete and separate roofing systems such as standing seam metal roof systems that are designed to transmit the roof loads directly the buildings structural systems and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings. 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. Install the roofing screws vertically along each rib in the panel.

The metal will be attached to at least 3 4 purlin and 1 2 plywood instead of just 1 2 plywood which should make the overall roofing system stronger. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. See the image below. But probably the best benefit that comes from using purlins is the air gap it creates between the metal roof and the existing shingle roof.

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. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building.