Installing A Metal Roof Directly To Plywood

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 a metal roof directly to plywood.

How to apply metal roofing over plywood step 1. 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. 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.

Sweep the plywood clean of all dirt and debris with a push broom. But it seems the condensation will affect the 2x4 strapping. Always begin working at the point with the longest peak to eave distance. Take care the first piece is aligned precisely perpendicular square to the edge.

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. To watch the entire series from the beginning click here. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. 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.

Repair any rotted sections of plywood before installing the metal panels. 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. Place the first screw. 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.

Epdm roofing installation faq. If a proper roof inspection isn t done the 1x4 s could be installed over rotten plywood which means the screws could pull out. Add the metal panels. Use the reinforced solitex mento plus roof underlayment on top of your rafters.

Inspect the plywood for damaged areas. Add purlins on top of this for venting and drainage then add horizontal purlins to mount the metal roof to. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. 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.