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.

Applying the underlayment and the slip sheet. 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. You will use metal roofing screws to secure the metal panels to the sheathing. To watch the entire series from the beginning click here.

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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. This is not a complete install only basic install on a bungalow i.

After the original roofing is removed what you will want to do first is look for bad pieces of. Remove all unused vents pipes and protrusions. Most metal roofs will also require underlayment as well as a slip sheet. Use your neoprene washer head screws to secure the metal to the sheathing.

Install the roofing screws vertically along each rib in the panel. Place the first screw. Moreover try to ensure that the screws are all aligned evenly. Inspect the plywood for damaged areas.

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. And for any exposed fasteners try to avoid over tightening them. Repair any rotted sections of plywood before installing the metal panels.

But it seems the condensation will affect the 2x4 strapping. 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. Try to space the screws about 12 inches apart down the entire piece of metal. How to apply metal roofing over plywood step 1.

In this installation the vapor barrier is installed on the side of the insulation nearest the interior of the building.