Installing Metal Roofing On Plywood

Try to space the screws about 12 inches apart down the entire piece of metal.

Installing metal roofing on plywood. Use your neoprene washer head screws to secure the metal to the sheathing. Inspect the plywood for damaged areas. Remove all unused vents pipes and protrusions. Applying the underlayment and the slip sheet.

Sweep the plywood clean of all dirt and debris with a push broom. Space the screws about 12 in 30 cm apart. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. 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.

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. Repair any rotted sections of plywood before installing the metal panels. Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. How to apply metal roofing over plywood step 1.

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. But it seems the condensation will affect the 2x4 strapping. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. If a proper roof inspection isn t done the 1x4 s could be installed over rotten plywood which means the screws could pull out.

Install the roofing screws vertically along each rib in the panel. For exposed fasteners avoid over tightening the fastener. 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. 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.

Most metal roofs will also require underlayment as well as a slip sheet. And for any exposed fasteners try to avoid over tightening them. After the original roofing is removed what you will want to do first is look for bad pieces of. How to install metal roofing over plywood inspect your plywood.