Founded in 1939, the Steel Deck Institute (SDI) is a trade association representing steel deck manufacturers and those manufacturing products used in conjunction with steel deck. The SDI actively publishes design manuals, develops standards for steel roof and floor deck, offers website tools, provides an industry standard EPD, offers educational opportunities, and supports research related to steel deck.  Our most recent publications are the Second Editions of the Roof Deck and Floor Deck Design Manuals, which include additional information regarding concentrated loads. (less)