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Steel joists are welded steel products that are used to frame a building and support the deck (which, in turn, supports a building’s roof and floors). They are custom engineered to suit the design of each building. Joists in this EPD represent product manufactured in North America from steel product produced in North America. Open Web Steel Joists, which are secondary framing members, range from 0.254 to 0.51meters deep, and up to 73 meters long. Joist Girders, which are primary framing members, range from 0.51 to 3.1 meters deep and up to 37 meters long. Composite Joists are open web product that are used in the construction of concrete roofs and floors allowing composite action between the joist and the concrete, range from 0.254 to 2.4 meters deep, and up to 37 meters long.