The intentional omission of floating and troweling in favor of finishing by grinding is proving a useful method of constructing certain types of floors in this country. The method has been in use in Europe for some time. The proprietary method involves placing, screeding and bull-floating the concrete, curing it for 2 to 5 days, and finally using a machine which is a grinder-finisher. The resulting surface is flat and slightly porous with a sanded appearance. It is free of ridges, trowel marks and other protrusions, and surfaces have closer tolerances than trowel-finished floors. Finishing is usually done at the rate of 4000 square feet per man per day. No weak surface film remains. The method produces an excellent base for tile, linoleum, resilient flooring and carpeting and is useful in high-rise construction, commercial and institutional buildings, residential construction, shopping centers, loading docks and for tilt-up panels that are to be painted. There is a big saving in labor because of the elimination of waiting time-usually including overtime- for bleed water to leave the surface before floating and trowel finishing. One of the main advantages of the method is that it makes floor finishing less dependent on weather. In cold weather the operations of placing, bull-floating, and edging are continued until late afternoon, leaving only enough time for normal cleanup operations. In hot weather there is little danger of slabs getting away from the crew because the only operations after placement are bull-floating and edging. Consequently smaller crews normally place more concrete and still maintain control. Furthermore, the finishing results are more predictable.