Install Metal Roofing Over Plywood

You will use metal roofing screws to secure the metal panels to the sheathing.

Install metal roofing over plywood.

And for any exposed fasteners try to avoid over tightening them. Sweep the plywood clean of all dirt and debris with a push broom. Inspect the plywood for damaged areas. Space the screws about 12 in 30 cm apart.

If a proper roof inspection isn t done the 1x4 s could be installed over rotten plywood which means the screws could pull out. How to install metal roofing over plywood inspect your plywood. Applying the underlayment and the slip sheet. Metal roof installation 2 of 6 featuring edco products.

Repair any rotted sections of plywood before installing the metal panels. Use your neoprene washer head screws to secure the metal to the sheathing. 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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

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. How to apply metal roofing over plywood step 1. Moreover try to ensure that the screws are all aligned evenly. 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.

Place the first screw. 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. Try to space the screws about 12 inches apart down the entire piece of metal. Install the roofing screws vertically along each rib in the panel.

Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. Most metal roofs will also require underlayment as well as a slip sheet. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. Remove all unused vents pipes and protrusions.

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.