ANSWERS TO SELF TEST
Good estimating helps to insure completion of projects on time and the economical use of men, materials, and
equipment (para 4-1a).
The first thing an estimator should do is to become thoroughly familiar with the project by studying the plans
and specifications and the work site itself (para 4-1b(1)).
Information for preparing the bill of materials is obtained from drawings and specifications (para 4-1b(3)).
If plans are altered or modified, the materials estimator will have to make the required additions and deletions
to the accompanying bills (para 4-3a).
No matter what system is used in the preparation of a bill of materials, the following five elements are
essential (para 4-4a).
Grouping and arranging
Parts are always listed separately unless size and nomenclature are identical (para 4-5b(1)).
When determining the number of pieces of standard length lumber required, the materials estimator must
determine the standard length that will produce the most parts with the least waste (para 4-5b(3)).
In column 3 enter 6 (number of pieces) and in column 5 enter 8'10" (length in place) (para 4-5c, 4-6, fig. 4-5).
Nominal size of skirtboards is 1" x 6" which is entered in column 4 (para 4-5c, 4-6, fig. 4-5).
In column 4 enter 1" x 6" (nominal size) and in column 5 enter 4'10" (length in place) (para 4-5c, 4-6, fig. 4-
The shortest standard length which supplies the most pieces with the least waste is normally chosen (para 4-
From the floor plan in figure 4-5 it is determined that the length in place of the 1 x 6's is 9'2". A standard 10-
footer would have 10" of waste. Any other standard length would have more waste except a 20-footer which
would provide 2 pieces and have 20" waste. Therefore, by the rule cited in exercise 11, a standard 10-footer
would be chosen (para 4-5c, 4-6, fig. 4-5).