CHAPTER XXVI 



SHORT NOTES ON ESTIMATING QUANTITIES— WORKING DRAWINGS FOR A 



SMALL COTTAGE 



A few words on taking ont quantities may be helpful to the farmer, 

 though no attempt at a comprehensive treatment of the subject will 

 be made. 



Estimating Brickwork. — In calculating the number of bricks required 

 for a building the following procedure may be adopted : — 



(1) Calculate the number of square yards of wall. 



(2) Allow 90 bricks per square yard in the case of a 9 -inch wall ; and 

 140 bricks per square yard in the case of a 14-inch wall. 



These allowances are approximate only. 



The method will be best illustrated by an example. 



Example. — A brick wall is to be 12 feet high, by 30 feet long, by 

 14 inches thick. Calculate the number of bricks required to build 

 the wall. 



(1) The number of square yards of wall is found by multiplying the 



height of the wall in yards by its length, also in yards. 

 Now the height is 12 feet, or 4 yards, while the length is 30 feet 

 10 yards, therefore — 



Number of square yards of wall = 4 X 10 = 40 



(2) Allowing 140 bricks per square yard of wall, the total number 



of bricks required will be found by multiplying the number of 

 square yards of wall by 140, thus — 



Total number of bricks required = 40 X 140 = 5600 answer. 



Quantities of Materials required for the Mortar for Brickwork, Rubble 

 Masonry, Pointing, and Plastering. — One cubic yard of lime, 3 cubic yards 

 of sand, and 150 gallons of water make 71 cubic feet of 1 : 3 mortar, 

 which is sufficient to lay 4350 bricks. 



