Plasterers' work is of two kinds, namely, ceiling-which is plastering upon laths - and rendering, which is plastering upon walls, which are measured separately.

The contents are estimated either by the foot or yard, or square of 100 feet. Enriched mouldings, etc, are rated by running or lineal measure. One foot extra is allowed for each mitre.

One half of the openings, windows, doors, etc., allowed to compensate for trouble of finishing returns at top and sides.

Cornices and mouldings, if 12 inches or more in girt, are sometimes estimated by the sq ft.: if less than 12 inches they are usually measured by the lineal foot.

1 bushel of cement will cover 1 1-7 square yards at 1 inch in thickness.

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1 1/2

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2 1/4

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1 bushel of cement and 1 of sand will caver 2¼ sq. yds. at 1 inch in thickness.

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1 bushel of cement and 2 of sand will cover 3 1/3 square yds. at 1 inch in thickness.

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4 1/2

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3/4

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6 3/4

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1/2

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1 cwl. of mastic and 1 gallon of oil will cover 1½ yards at ¾, or 2½ at ½ inch,

1 cubic yard of lime, 2 yards of road or drift sand, and 3 bushels of hair, will cover 75 yards of render and set on brick, and 70 yards on lath, or 65 yards plaster, or render, 2 coats and set on brick, and 60 yards on lath; floated work will require about the same as 2 coats and set.

Laths are I ¼ to 1½ inches by 4 feet in length, and are usually set ¼th of an inch apart. A bundle contains 100. 1 bundle of laths and 500 nails cover about 4½ yds.