Metal Roofing Directly On Plywood

How to apply metal roofing over plywood step 1.

Metal roofing directly on plywood.

Considering when to. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Install the roofing screws vertically along each rib in the panel. Hi todd i have a pole barn design structure that had been turned into a livable dwelling with cathedral ceilings using rigid foam between the metal roof and the ceiling sheetrock i am redoing this and putting a decking down with tyvek protec 200 and then reattaching the metal roof and adding circular pest resistant soffit vents at the end rafters of the roof between purlins for ventilation.

Yes metal roofs are placed directly to the plywood over icynene insulated roof sheathing thats how i always had it done and warranteed. 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. Repair any rotted sections of plywood before installing the metal panels. 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.

Do you need plywood under metal roofing. Remove all unused vents pipes and protrusions. Inspect the plywood for damaged areas. Also there are numerous better underlayment products as mentioned above including grace products and a host of others all better than felt.

For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Sweep the plywood clean of all dirt and debris with a push broom. But it seems the condensation will affect the 2x4 strapping.