SURFACE TREATMENT The surface treatment which a walk receives depends largely upon the practice in the com munity in which the work is being done. The smooth, steel-trowel finish is probably the most common and at the same time the poorest finish used. Such a finish frequently results in crazing or hair-checking of the surface, which is due to nothing more than a slight contraction which takes place in the film formed on the surface by the steel trowel. Besides the smooth finish showing every little blemish and variation in color, it is much more slippery than any of the other finishes.
The wooden-trowel finish is growing in popu larity, and certainly has many points in its favor. The brush finish is similar to the wooden-trowel finish, but it requires an addi tional tool, and one that can be used for no other purpose. The finishes that are produced by special tools, like the tooth-roller, etc., have little to commend them. They are in no way superior to the rough finish produced in a simpler manner, and do not harmonize so well with the usual surroundings.
Positive joints should always be provided in the base of the walk. These are the real joints, and the markings in the top should always occur over them. It is not sufficient to make a surface
marking, together with a feeble effort toward cutting through the base with a small trowel or similar instrument. More walks are disfigured by failure on the part of the builder to provide proper joints than by any other cause.