Systems of reinforced concrete slabs on steel decks can be used to save time and expense. They offer certain advantages over conventional construction. One is that they replace conventional work forming and bar reinforcement. They can also eliminate shoring. The dead load of the decking is low yet it provides a working platform for other trades. Its die set ends provide neat fitting end laps and the whole deck is sufficiently impervious to minimize concrete leakage and to prevent moisture loss from the bottom surface during the curing period. Any of a variety of configurations may be chosen, depending on the strength required, the building framing design, ceiling surface desired and what utility provisions are needed. Decks are available which provide a smooth ceiling finish or a ribbed design. Built-in ducts for electrical wiring, heating, air conditioning and plumbing may be specified. Galvanized, painted or uncoated finishes may be ordered, and ceilings may be field painted in any color. Job scheduling is important in erecting steel deck. Decking should be installed and covered as soon as possible after it arrives on the jobsite, because most finishes on the steel are not designed to protect it during long periods of exposure. Welding is the usual method of attaching the decking to support beams. Safety requires that this be done immediately after the sheets area aligned so that gusts of wind do not displace sheets and endanger workers below. The welder generally follows closely behind the decking placement crew and welds from the top side of the deck. Fusion welding is usually employed because it is efficient and economical. During placement of concrete, care should be taken to avoid overloading the decking or supporting structural members.