=5.= The drawings and specifications of a structure are the guides that
the estimator must follow in making his computations. All measurements
necessary for calculating the quantity of the materials required are
obtained from the drawings; and all information in regard to the
character of the workmanship and the quality of the materials to be
used is furnished by the specifications.
In compiling a schedule, there are three stages to the operation: (1)
Taking the dimensions for each of the various classes of work; (2)
computing and collecting the quantities; and (3) estimating the cost.
In carrying out the first of these steps, each of its subdivisions
should be considered in the order in which the work will be executed in
the building. This order is about as follows:
1. Excavation 8. Joinery
2. Concrete work 9. Hardware and ironwork
3. Stonework 10. Heating and ventilation
4. Brickwork 11. Plumbing and gas-fitting
5. Carpentry 12. Painting and papering
6. Roofing 13. Glazing
7. Plastering
The third step, estimating the cost, may be subdivided into cost of
labor and cost of material. The latter can be definitely fixed by an
examination of lists giving current prices of materials; while the
former must be based on a fixed rate of wages per day for the various
classes of workmen.
The second and third branches of the work, being closely connected with
the first, will be partly considered in connection with it, and, later,
in detail in the complete example on estimating.