Obviously, the aims of owner and designers should be to create a building that will reduce the likelihood of a major fire to a minimum and one that will contain any fire that does occur to as small an area as possible. How is this done? The most obvious and most important first step in designing fire safety, and overall economy, into the structure is made in the selection of the basic material of construction. Too frequently a lower grade of construction has been used because someone assumed they couldn't afford concrete. When a structure is realistically designed both in concrete and a competitive material to satisfy identical criteria, the bids in concrete often come in lower in first cost. After the decision has been made that concrete will be the basic material of construction there are other matters that should be kept in mind to enhance the fire resistance of the building. Consider leaving the concrete roof or structural roof slabs exposed on the soffit rather than installing a dropped ceiling. Many materials used for dropped ceilings are combustible. Avoid using pipe or steel columns. They can increase insurance premiums considerably; and, even more important, during fires they can fail early and suddenly, even causing the failure of roofs bearing on them that are in themselves still structurally sound. And never use combustible heating or air conditioning ducts. Although their initial cost is somewhat lower, the large insurance penalty they carry render them poor bargains. Those areas of buildings in which flammable products are stored or used and areas where open flame operations are conducted require special consideration by designers. If possible red label products should be both stored and used in a structure separate from the main building. If such areas must be incorporated into the main building, they must be isolated structurally and environmentally. Sparks must be eliminated in red label areas. To create a spark-safe heavy-duty uncovered concrete floor one must build it with a conductive binder and see that it remains thoroughly conductive and grounded. The most common method is to apply a special metallic-aggregate conductive dry shake during construction.