Plain roof, 4 " exposure, 990; roof cut up, 1010
Plain roof, 4½" exposure, 880; roof cut up, 900
Plain roof, 5 " exposure, 790; roof cut up, 810
Lath. Lath for interior plaster work are usually ⅜" by 1⅜" by 4', put up in bundles of 50 each and are sold by the 1000. 1000 lath will cover 70 yards of surface and will require 8 lbs. of 3d fine lath nails. Lathing is usually considered a part of the plasterer's contract. There is no uniformity of practice as to the deduction for openings.
Building Papers. The cheapest is "rosin sized," and is not waterproof. This is used mainly under floors and upon side walls under bevel siding. It is sold by the pound in rolls each 36" wide containing 500 square feet.
Dry felt is used where better protection from cold is desired. In the cheaper grades, the material is made of wood fiber and rosin. In the better grades wool is used. Tar felt, used where moisture is to be resisted, is dry felt saturated with tar. These materials are sold by the pound: 12, 15, and 20 lbs. to the 100 square feet, in rolls of various widths. A catalog should be consulted for weights and covering capacity.
78. Estimating Millwork Quantities.—The number of doors and windows will be determined by an actual count.
Mouldings, casings, baseboard when moulded, window stools, etc., are sold by the 100 feet lineal measure, random lengths. Extra charge is made for specified lengths where the quantities are determined by scale measurements of the plan and elevations. Window frames of stock sizes, door frames, inside jambs, stair parts, buffets, etc., will be found priced in millmen's catalogs, and assist greatly in determining prices for ordinary work. This text cannot give space to list such data, which is so readily obtained from commercial catalogs.
79. Example of Form for Bill of Materials.—
| BILL | ||||||||||
| Ticket or Catalog Number | No. of Feet | No. of Pieces | Size | Length | Description | Price | ||||
| Rate | Extensions | |||||||||
| 270 | 30 | 2 × 4 | 14 | Y. P., SIS and IE | 22 | 5 | 94 | |||
| 2 | M | 5-2" red cedar shingles | 3 | 55 | 7 | 10 | ||||
| 300 | 1 × 6 | # 2 Y. P.— flooring | 20 | 6 | 00 | 19 40 | ||||
80. Estimating Labor Costs.[A]—In estimating labor costs the following data is to be made use of. The estimator will have to determine the hours per day and the scale of wages per hour paid in his locality, and make whatever changes in the data is necessary. He should also compare the quantity of work done by men he may observe with that given herewith. The time data herewith is based upon the work of one mechanic who has mastered his trade fairly well. With an efficient foreman and a selected group of workmen these time allowances can be reduced in many instances as much as one-half. Experience alone will determine the possibilities of such reductions with safety.
[A] For a more complete treatise of labor costs, the student is referred to Gillette's Handbook of Cost Data, Section X, the source, in the main, of the basis of this data.