Except for flash setting and one or two other troubles caused by high temperatures, the ills that beset concrete placed during the summer months are less obvious at early stages than those encountered in cold weather. Concrete surfaces exposed to direct sunlight and high winds dry out rapidly; as a result, they fail to develop adequate strength to prevent dusting. Premature stiffening makes adequate finishing impossible, with accompanying adverse effects. Crazing becomes more prominent. When floors improperly concreted in the summer are exposed to traffic, the toll of poor practices shows up inevitable in the form of crazing, spalling and dusting. Walls, roofs and other building components also soon begin to show the telltale signs of incorrect procedures. To avoid troubles in summer concreting, observe the following rules: (1) have enough men to place and finish the concrete rapidly. (2) Dampen the subgrade, reinforcement and forms. (3) Don't use accelerators. (4) If needed, use a retarder. (5) Don't keep the ready mix truck waiting. (6) Shade the concrete after placing. (7) Protect freshly placed concrete from dry winds. (8) Cure throughly for at least 3 days (7 days for floors). And (9) protect test cylinders from loss of moisture.