How To Install Metal Roofing Over Plywood

In this video i m installing some metal roofing over an existing ash fault shingled roof.

How to install metal roofing over plywood.

Inspect the plywood for damaged areas. How to apply metal roofing over plywood step 1. Make sure that the screws are all aligned evenly as you will be able to see them from the ground if they are. Place the first screw.

Applying the underlayment and the slip sheet. Most metal roofs will also require underlayment as well as a slip sheet. Try to space the screws about 12 inches apart down the entire piece of metal. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Space the screws about 12 in 30 cm apart. Sweep the plywood clean of all dirt and debris with a push broom. Moreover try to ensure that the screws are all aligned evenly. And for any exposed fasteners try to avoid over tightening them.

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. 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. In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building. For exposed fasteners avoid over tightening the fastener.

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. You will use metal roofing screws to secure the metal panels to the sheathing. Repair any rotted sections of plywood before installing the metal panels.

How to install metal roofing over plywood inspect your plywood. Install the roofing screws vertically along each rib in the panel. 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. This is not a complete install only basic install on a bungalow i.

But it seems the condensation will affect the 2x4 strapping.