Most recreational installations involve rigid specifications for surface texture, freedom from cracking, horizontal trueness, durability requirements, and other performance characteristics that often exceed normal construction requirements. Sidewalks still serve their purpose despite cracking or spalling, but these same imperfections are disastrous on a slab constructed for playing shuffleboard. Special surface requirements such as exposed aggregates, integral coloring, and distinctive textures are also fairly common. All of these factors add up to a need for painstaking workmanship and extraordinary care in interpretation of specifications. Details of the more common recreational applications of concrete that have been promulgated by recognized authorities are given here. The following general comments cover suggested procedures common to most of these applications. To ensure accurate bounce, a playing court surface must be smooth, true, and virtually free from cracking. To achieve the required surface quality, a solid subgrade and excellent drainage are important prerequisites. Siting the playing court is most important in determining its continuing good performance. The site should be level and well drained. The slab should be level and well drained. The slab should be considerably above the high ground water level; if the existing grade is less than 1 and one-half feet above this level, field tiles should be employed or the level should be raised by fill. Slabs for ice skating rinks, especially outdoor installations, are inevitably subjected to many cycles of wetting-drying, as well as to conditions which tend to deteriorate concrete. As a result the concrete must be especially strong and have an adequate air content. As in other slabwork for recreational uses, the slab must be as monolithic as possible. The coolant fluid should not be circulated until the concrete has developed adequate strength. Since roller skating rinks are subjected to considerable abrasion by skates repeatedly following the same paths, the application of a surface hardener, such as a dry shake, is advisable.