The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California

Plumbing Heating And Piping

4. Site conditions regarding storage of materials, work space, and
possible job-shop layout
5. Weather, expected rainfall and temperature, and its effect on
the progress of the job
6. Work type, manual or mechanical operations
7. Specifications and inspection
8. Delays, material, and design

Each of these elements which affect the estimate should be evaluated separately. The average of this evaluation, based on efficiency factors used in this book, will be a proj ect efficiency factor E. The headings of all tables of labor factors will appear as follows:

An efficiency factor of 1.0 indicates that average conditions prevail. An efficiency factor of 0.6 will mean that conditions are such that the estimator believes that it will require only 60 per cent of the average labor. By the same token, an efficiency factor of 1.5 states that the project as a whole, or a particular operation, as the case may be, is so difficult that the labor will be 50 per cent greater than average. The following is an example of the method used by the estimator to determine the project efficiency factor E.

Economy Labor Supervision Site conditions Weather Work type Specifications and inspection Delays Total	0.9 1.3 1.0 0.8 0.7 0.8 1.3 1.0 7.8
Project E = 7.8 -7 8 = 0.975; use 1.0

This project E indicates that in the judgment of the estimator the project as a whole will be average as far as labor costs are concerned. It is highly probable that one or more specific sections or systems of the work may vary one way or the other from this project E. As an example, the estimator may consider that even though project E is equal to 1.0 the water piping will be less costly from a labor standpoint. He can then arbitrarily set E at 0.6, 0.7, 0.8, or 0.9 for water piping only.