ROOFS, CHIMNEYS, ETC.
Cement shingles of various shapes and de signs—in some cases reinforced with fine wire mesh—are beginning to be used extensively, and are giving the best of satisfaction when properly laid. They are applied in the same way as slate, and provision must be carefully made to avoid cracking during the process of laying. In some instances this is done by inserting in the body of the shingle small pieces of asbestos board through which the nails or screws may be driven.
The question of obtaining satisfactory roof ing for industrial plants has been a perplexing problem for some time. There are a number of roof coverings which give satisfactory service for a time; but, when subjected to the elements, it is only a matter of a short period until they are partially or totally destroyed. The fumes and gases from furnaces and factories, prevalent in manufacturing districts, attack the old-time roofing, and accomplish the work of destruction in a comparatively short time. The natural ele ments bring the same results in a somewhat longer period.
Cement roofing has proven itself economical, practical, and durable. While the original cost of this kind of roofing is somewhat more than that of slate or other materials, in the end the concrete covering always proves the most econ omical.
Cement roofing tile have proven their tability on a large number of buildings of prominent industrial concerns. The tile are re inforced. The weight, which will about equal that of a slate roof on two-inch sheathing, is in the neighborhood of thirteen pounds to the square foot. The tile are about seven-eighths of an inch in thickness, cover a space four feet long by two feet wide, and are attached directly to the purlins. A permanent red color is ob tained in these tile, which is claimed to be non effaceable by the elements, requiring no painting. The tile are self-adjustable and interlocking, which provides in every way for expansion, con traction, and vibration, and at the same time afford a covering unaffected by temperature changes, and one which is fireproof and water proof. See Plate 1, upper figure.