A highly efficient system of floor construction that eliminates the work of troweling has been in use for about four years in Denmark. In essence it involves producing a float surface by screeding and bullfloating, covering the surface for a day or more and then grinding off the laitance layer to produce a sandpaper-like but not polished surface. An immediate advantage is that much overtime is eliminated. The usual method of floor construction- finishing by troweling- can produce excellent, hard-wearing floors when properly done. This standard method has the disadvantage, however, that the timing at which troweling is started is critical in determining how durable the surface will be. For good results it is necessary to wait for the excess bleed water to evaporate and for the concrete to stiffen sufficiently to support the weight of the troweling machine and its operator. This means either that floor laying has to be stopped at about midday so that finishing can be completed within normal working hours or else that considerable periods of overtime must be put in. Some of this overtime is often spent in simply waiting until it is safe to start troweling. By the new method concrete can be laid throughout the full working day with almost no concern for the rate of bleeding and setting. Overtime can be virtually eliminated. Another advantage of the method is that it makes it easy to use the long strip method of floor construction. This makes floor construction simpler than the common checkerboard system. The method is said to have reduced the cost of finishing floors in Denmark by about 50 percent. Hard-wearing industrial floors produced in this way have been dust-free, or virtually so. Floors to be covered with carpet of tile have been produced with sufficiently low tolerances hat it has not been necessary to use leveling compounds or underlayment.