Metal Roofing Directly On Plywood

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.

Metal roofing directly on plywood.

Do you need plywood under metal roofing. In a barn shop or other outbuilding you can attach your metal roof directly to the purlins. Remove all unused vents pipes and protrusions. 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.

Inspect the plywood for damaged areas. How to apply metal roofing over plywood step 1. Repair any rotted sections of plywood before installing the metal panels. Yes metal roofs are placed directly to the plywood over icynene insulated roof sheathing thats how i always had it done and warranteed.

Considering when to. Sweep the plywood clean of all dirt and debris with a push broom. Place the first screw. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

Also there are numerous better underlayment products as mentioned above including grace products and a host of others all better than felt. 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. But it seems the condensation will affect the 2x4 strapping.