The Golden State: Where & How to Live, Secure, Visit, Enjoy and Thrive in California
Plumbing Heating And Piping
Plumbing Labor and Material Tables
7.1. General Discussion of Tables
The tables given in this chapter should be used only after thorough study of Chaps. 1, 3, and 4. The manner in which they are to be used is explained in Chaps. 1 and 3, whereas each specific table is explained in the appropriate paragraph of Chap. 4.
The success or failure in the use of these tables as well as other information given in this book will depend largely on the judgment of the estimator. This is nothing new in the field of estimating. Good judgment always has been, and always will be, the only sound basis for any successful estimate.
Average conditions pertaining to the installation of the material for any system is indicated in these tables by E = 1.0. It is believed that these labor factors given for E = 1.0 do represent average conditions, and this has been proved by use. However, it should be realized that average in one locality may not be average in another, or average for one firm may not be average for another. It is here that the estimator should give careful consideration. A study of labor factors given for E — 1.0 in any one of these tables should reveal their relationship to average conditions in the locality in which the estimator is working. If they do not appear to be average, it is a small matter to revise the table to suit the local conditions. To do this, the estimator merely revises the column E = 1.0 to suit what he believes to be average. He then multiplies each of these figures by the efficiency factor or heading of each column, placing the product in the appropriate place in the table. The table is then in proper relationship to what he believes to be true conditions for average. After this is done, the table may be used as described in the text.
Once the estimator has become completely familiar with the method used in this book, has evaluated the tables, and revised those which he believes to require revision, his job is tremendously simplified. He can then make the take-off of material with a notation at the beginning of each system of the efficiency factor he wants used for that system and then turn the take-off over to a clerk or stenographer for setting down the labor factors, extending, and totaling. In this way his time can be used to greater advantage on the take-off of more jobs.
7.2. Plumbing Table Index
The following is a list of tables predominantly used in plumbing work. Some of these tables will, no doubt, be found useful in parts of heating or piping jobs. As an example, water-piping tables may be used for any other type of system having comparable requirements. The list of tables gives the table number, the description of the table, and a reference to an article in the text where additional information may be found concerning the subject.
