=34. Brickwork= is generally estimated by the thousand bricks laid in
the wall, but measurements by the cubic yard and the perch are also
used. The following data will be useful in calculating the number
of bricks in a wall. For each superficial, or square, foot of wall
4 inches (the width of one brick) in thickness, allow 7½ bricks;
for a 9-inch (the width of two bricks) wall, count 15 bricks; for a
13-inch (the width of three bricks) wall, allow 22½ bricks; and so on,
estimating 7½ bricks for each additional 4 inches in thickness of the
wall. The preceding figures are for bricks about 8½ in. × 4 in. × 2¼
in. in size. If smaller bricks are used, the thickness of the walls
will be decreased proportionately.
If brickwork is estimated by the cubic yard, allow 500 bricks to a
yard. This figure is based on the use of bricks of the size just
given and mortar joints not over ⅜ inch thick. If the joints are ⅛
inch thick, as in face brickwork, 1 cubic yard will require about 575
bricks. In making calculations of the number of bricks required, an
allowance of, say, 5 per cent. should be made for waste in breakage,
etc.
The practice in regard to deductions for openings is not uniform
throughout the United States, but, usually, small openings are counted
solid, as the cost of the extra labor and the waste in working around
these places balances that of the brickwork saved. All large openings,
100 square feet or over in area, should be deducted. When openings are
measured solid, it is not customary to allow extra compensation for
arches, pilasters, corbels, etc.
Rubbed and ornamental brickwork should be measured separately, and
charged for at a special rate.