The Steel Deck Institute (SDI) is a trade association representing 19 full members and 10 associate members. Full Members are manufacturers of steel deck and Associate Members are manufacturers of products related to the use of steel deck. The SDI publishes manuals for the design and use of steel roof and floor deck and for diaphragm design. Our newest publication is the Third Edition of the SDI Manual of Construction with Steel Deck (MOC3). (less)