This section is from the book "The Building Trades Pocketbook", by International Correspondence Schools. Also available from Amazon: Building Trades Pocketbook: a Handy Manual of reference on Building Construction.
Barrels Cement (Packed).
Sand. Cu. Yd.
Portland or Eastern Rosendale.
If brickwork is figured by the thousand brick, the quantities of cement and sand obtained by aid of these tables should be multiplied by either 2 1/2, 2, or 1 3/4, according to whether the brickwork is coarse, ordinary, or pressed. The last given figures are the number of cubic yards which 1,000 standard size brick will lay.
As a perch is 11/12 of a cubic yard, if stonework is thus estimated, the figures in the tables may be used for perch measurement by deducting 1/12 from the final results.
How many barrels of Eastern Rosendale cement and cubic yards of sand will be required for laying 100 cu. yd. of rubble masonry in l-to-3 cement mortar? By the first table, it is seen that the minimum percentage of mortar in coarse rubble is 33; hence, for each cubic yard of masonry 1/3 cu. yd. of mortar is required. According to the second table, a l-to-3 mortar requires, per cubic yard. 2 bbl. of cement and .9 cu. yd. of sand; or 1 cu. yd. of rubble requires 2/3 bbl. of cement and .3 cu. yd. of sand; and for 100 cu. yd. the quantities are 67 bbl. of cement and 30 cu. yd. of sand.
While founded on actual work, the above tables are not intended to furnish more than fairly close approximations, as there are so many uncertainties about mortar and masonry that very accurate estimates cannot be made.