Installing A Metal Roof Directly To 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.

Installing a metal roof directly to plywood.

Add purlins on top of this for venting and drainage then add horizontal purlins to mount the metal roof to. Epdm roofing installation faq. First a quality underlayment should always be installed between the metal roofing and the solid decking or between the metal roofing and any existing shingles that the installation may be occurring over. How to apply metal roofing over plywood step 1.

Use the reinforced solitex mento plus roof underlayment on top of your rafters. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. Repair any rotted sections of plywood before installing the metal panels. Take care the first piece is aligned precisely perpendicular square to the edge.

Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 4 in 1 9 cm. To watch the entire series from the beginning click here. 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. Add the metal panels.

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. Inspect the plywood for damaged areas. If a proper roof inspection isn t done the 1x4 s could be installed over rotten plywood which means the screws could pull out. Do need to rack the house with sheathing on walls or cross bracing.

Install the roofing screws vertically along each rib in the panel. Always begin working at the point with the longest peak to eave distance. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. But it seems the condensation will affect the 2x4 strapping.

Remove all unused vents pipes and protrusions. 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. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. Installing the metal roofing over 1x4 s allows the ability to also install additional insulation under the metal roof that can t be done the other two ways.