Metal Roof Directly On Felt And Sheathing

Install the first metal panel on the low end of the roof square to the eave.

Metal roof directly on felt and sheathing.

Overlap the next panel straight above the first by 12 inches and secure it the same way you secured the first. Metal roofing is about 135 sq so that makes it around 4700 plus a few hundred for the purlins. Begin on the left side of the roof working to the right. Make sure there s a 1 inch overlap the edge of the roof by one inch then secure it by drilling 1 and 1 2 inch galvanized metal screws through the panel in 12 inch to 16 inch intervals.

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. Overlap the edge of the roof by 1 inch. Standing seam and flat shingle roofs are in direct contact with the roof sheathing. Secure the metal panel to the deck by drilling 1 1 2 inch galvanized metal screws through the peak of the rib in 12 inch to 16 inch intervals.

Work toward the ridge. I d not install plastic on the sheathing because it s a vapor barrier. Felt and ice and water is 415 so that totals 4608. Stamped shingle look metal roofing is more likely to dent because there s a small air space between the metal panel and the roof sheathing.

There are some roofers out there that believe that since metal is such a great material and since it generally comes in large sheets making it all but impermeable they can skip the underlayment section and attach the metal directly to the sheathing. The 2006 irc that minnesota uses says that metal roofing can be installed with solid or spaced sheathing per the manufacturer.