Metal Roofing Directly Over Plywood

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.

Metal roofing directly over plywood.

Video of the day. 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. See the image below. 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.

Install waterproof felt over the plywood to add protection against moisture. 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. 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. But it seems the condensation will affect the 2x4 strapping.

The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. 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. To learn more about installing the correct underlayments for your metal roof project or to get a quote feel free to contact us here. See the image below.

Yes metal roofs are placed directly to the plywood over icynene insulated roof sheathing thats how i always had it done and warranteed. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. 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 the roofing screws vertically along each rib in the panel.

Also there are numerous better underlayment products as mentioned above including grace products and a host of others all better than felt. 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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.