How Many Screws Do I Need For Metal Roofing? Screw Pattern Placement ...
Example: 3,000 square feet divided by three (width of panel) = 1,000 then divide that by (spacing of sidelap screws) = 667 screws. You don't need metal to metal screws for the sidelap if using ⅞" Corrugated. You will only need sidelap screws for R Panel/PBR Panel and Western Rib/ Panel.