Tags: +2, 12", 12in, 305mm, bd-1200, bottom, build, build deck, BuildDeck, concrete, concrete floor, concrete roof, Deck, decking, dwg, elevated slab, eps cap, eps riser, Floor, front, green roof, insulated roof, long span, mezzanine level, Roof, room, safe, saferoom, section, Shelter, side, slab, span, stirrup, suspended slab, t beam, t-beam, tall beam, top, top hat, tornado shelter, twelve