Metal Roof Purlins Or Sheathing

Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

Metal roof purlins or sheathing.

Then the top of all your purlins once osb under metal roof panels is placed will be in the same plane and the roof steel will lay flat. Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Purlins girts and roof deck. For best results with aluminum panels use 300.

Metal roofing roof panels the home depot store finder. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. But i am convinced after inspecting thousands of asphalt shingled roofs metal is the way to go. Get free shipping on qualified metal roofing or buy online pick up in store today in the building materials department.

I am doing an exsposed fastener metal roof on my own place. Use screws with solid sheathing. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. In order to avoid a hump at the transition from two layers of materials to one the notation on the building plans advises to lower the roof purlins in these areas by 7 16.

Screws for use with steel panels are galvanized and then coated with an organic polymer for optimum cor rosion resistance. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. The difference in strength for wind and snow load are my concerns on whether to use purlins or sheathing versus cost.