Rubble masonry and stone backing are generally figured by the perch or cubic yard. Dimension-stone footings are measured by the square foot unless they are built of large, irregular stone, in which case they are measured the same as rubble. Ashlar work is always figured by the superficial foot; openings are usually deducted, and the jambs are measured in with the face work. Flagging and slabs of all kinds, such as hearths, treads for steps, etc., are measured by the square foot; sills, lintels, molding, belt courses, and cornices, by the linear foot; and irregular pieces, by the cubic foot. All carved work is done at an agreed price by the piece. DATA ON RUBBLE MASONRY =24.= The following proportions and cost of materials and amount of labor required to lay 1 perch of rubble masonry are reasonably accurate, and will serve to give an idea of how to estimate such work. A perch of rubble masonry requires, approximately, 2,500 pounds of stone. COST OF RUBBLE MASONRY _Using 1-to-3 Lime Mortar_ 1 perch of stone (25 cubic ft.) delivered at work $1.25 1 bushel of lime .25 ⅙ cubic yard of sand, at $1.50 per cubic yard .25 ½ day, mason’s labor, at $3.20 per day 1.60 ¼ day, helper’s labor, at $2 per day .50 ----- Total $3.85 _Using 1-to-3 Portland-Cement Mortar_ 1 perch of stone $1.25 ¾ barrel of Portland cement, at $2 per barrel 1.50 ¼ cubic yard of sand, at $1.50 per cubic yard .38 ½ day, mason’s labor, at $3.20 per day 1.60 ¼ day, helper’s labor, at $2 per day .50 ----- Total $5.23 To the preceding amounts should be added the cost of scaffolding and the builder’s profit. If the walls are over two stories in height, 60 cents per perch extra for hoisting should be added. DATA ON FLAGSTONES AND CURBING =25. Flagstones= for sidewalks, ordinary stock, natural surface, 3 inches thick, with joints pitched to line, in lengths (along walk) from 3 to 5 feet, will cost, for a 3-foot walk, about 11 cents per square foot (if 2 inches thick, 10½ cents); for a 4-foot walk, 12 cents; and for a 5-foot walk, 16 cents. The cost of laying all sizes will average about 3 cents per square foot. These figures do not include cost of hauling. Curbing, 4 in. × 24 in., granite, will cost from 40 to 50 cents per linear foot at the quarry; digging and setting will cost from 10 to 12 cents additional; and the cost of freight and hauling must also be added. DATA ON ASHLAR AND CUT STONE