The equipment rails shall be 18 gauge galvanized steel, monolithic construction, with integral base plate. Continuous welded corner seams, factory installed 2 x 4 wood nailer and including an 18 gauge galvanized counter-flashing complete with screws. On Built-Up or Modified Bitumen Roofing, Concrete, or Wood Decks without insulation use style ER-3A with built-in cant extended to full mitered corners with a height of 8" overall.