| Cubic feet | |
| Total volume, including voids | 368 |
| Total volume of voids | 99 |
| Total volume of masonry | 269 |
(4) Multiply net volume of masonry by the number of brick per cubic foot.
269 by 22.5 = 6,053 brick, or 6.1 thousand bricks.
Mortar
To estimate the mortar needed, multiply the mortar material given below for 1,000 brick by 6.1 to determine how much will be needed to build the chimney, using 1:1:6 mixture recommended on [page 10].
| Bags of hydrated lime | 2.6 | by | 6.1 | = | 16 bags. |
| Sacks of portland cement | 3.5 | by | 6.1 | = | 22 sacks. |
| Cubic feet of sand | 18.0 | by | 6.1 | = | 110 cubic feet = 4 cubic yards. |
Foundation
Concrete needed for foundation can be estimated as follows: Concrete for foundation should be 1:2½:5 and for the top 1:2½. The foundation is 7 by 3.75 by 1, or 26.25 cubic feet, or 1 cubic yard, and will require 5 sacks of cement, 0.46 cubic yard of sand, and 92 cubic yard of gravel. The cap is 4.5 by 2.66 by 0.5 = 5.9 cubic feet The area of the three flues above must be deducted: 5.9 minus 2.48 = 3.42 cubic feet, or one-ninth of a cubic yard. As 1 cubic yard was assumed for the foundation, extra cement and sand are not needed. Other material needed:
|
1 8-inch thimble, 9 inches long. 1 6-inch thimble, 9 inches long. 28 feet of 8½- by 13-inch flue lining. 20 feet of 13- by 13-inch flue lining. 20 feet of 8½- by 8½-inch flue lining. Damper, 36- by 10-inch throat opening. 2 clean-out doors and 1 ash dump. Mantel as selected. |
If firebrick is to be used or the exposed breast is to be of face or special brick (or ceramic tile) the number should be counted or estimated and deducted from the number of common brick as estimated above.