How To Install Metal Roofing Over Plywood

Inspect the plywood for damaged areas.

How to install metal roofing over plywood.

Try to space the screws about 12 inches apart down the entire piece of metal. In this video i m installing some metal roofing over an existing ash fault shingled roof. You will use metal roofing screws to secure the metal panels to the sheathing. Most metal roofs will also require underlayment as well as a slip sheet.

Moreover try to ensure that the screws are all aligned evenly. For exposed fasteners avoid over tightening the fastener. And for any exposed fasteners try to avoid over tightening them. Install the roofing screws vertically along each rib in the panel.

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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Use your neoprene washer head screws to secure the metal to the sheathing. To watch the entire series from the beginning click here.

Applying the underlayment and the slip sheet. 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. Space the screws about 12 in 30 cm apart. 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. This is not a complete install only basic install on a bungalow i. Place the first screw. Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are.

Sweep the plywood clean of all dirt and debris with a push broom. How to install metal roofing over plywood inspect your plywood. Repair any rotted sections of plywood before installing the metal panels. 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.