Measurzment of

Amount of Mortar Required.

The proportion of mortar to brick will vary with the size of the brick and with the thickness of the joints. With the standard size of brick (81X4X21 inches), a cubic yard of masonry, laid with 1- to finch joints, will require from 0.35 to 0.40 cu. yd. of mortar; or a thousand brick will require 0.80 to 0.90 cu. yd. If the joints are 1 to 1 inch, a cubic yard of masonry will require from 0.25 to 0.30 cu yd. of mortar; or a thou sand brick will require from 0.45 to 0.55 cu. yd. If the joints are } of an inch, a cubic yard of masonry will require from 0.10 to 0.15 cu. yd. of mortar; or a thousand brick will require from 0.15 to 0.20 cu. yd.

With the above data, and Table 22, page 120, the amount of cement and sand required for a specified number of brick, or for a given number of yards of masonry, can readily be determined.

Ordinarily 0.75 barrel of unslaked lime or 1 barrel of lime paste and 0.75 cu. yd. of sand will lay a thousand bricks.

Labor Required. "A

bricklayer, with a laborer to keep him supplied with materials, will lay on an average, in common house walls, about 1,500 bricks per day of 10 working hours; in the neater outer faces of brick buildings, from 1,000 to 1,200; in good ordinary street fronts, from S00 to 1,000; and in the very finest lower-story faces used in street fronts, from 150 to 300 according to the number of angles, etc. In plain massive engineering work, he should average about 2,000 bricks per day, or 4 cu. yd. of masonry; and in large arches, about 1,500, or 3 cu. yd." * In the United States Government buildings the cost of labor per thousand, including tools, etc., is estimated at seven eighths of the

wages for ten hours of mason and helper.

Table 56 and Table 57 give the actual labor, per cubic yard, required on some large and important jobs.

Table 57 shows the cost of the labor for five brick buildings forming part of a large manufacturing plant.$ Buildings No. 1 and 2 were long and low, with about equal amounts of S-inch . and 13-inch walls; buildings No. 3 and 4 had larger proportion of 13-inch wall; buiding No. 5 contained more brick than any of the others, and had 13-inch walls, with some 17-inch and 22-inch walls.

On building No. 1 local bricklayers were used at 50 cents per hour, but for the other buildings city bricklayers at 60 cents per hour were imported. The latter did better work and more of it, as shown by the table. About two or three weeks after the 60-cent brick layers started work, the inspector, being dissatisfied with the way the work was going, began preparing careful estimates of the brick laid each week and of the cost per 1,000 for bricklayers and helpers. Within three weeks after the first estimate, the output per brick layer had increased over 40 per cent, and about 30 per cent increase was maintained.

The total average cost of the brick masonry is as follows: _ _ _ Total Cost of Brick Masonry. The following is the cost of 660.cu. yd. (net) of brick masonry (307,000 brick) in a wall 18 inches thick and 25 feet high. The joints were to of an inch thick; and 465 brick laid a cubic yard.*