From book ESTIMATING IN BUILDING CONSTRUCTION 8TH EDITION CHAPTER 7 #16 16. Duri

Question

From book ESTIMATING IN BUILDING CONSTRUCTION 8TH EDITION

CHAPTER 7 #16

16. During the construction of a recent office building, your company’s framing crew installed 515 lineal feet of 8-foot-high, metal-stud wall in two days. The crew consisted of two carpenters and one helper and worked eight hours per day. Determine productivity rate in labor hours per foot of wall for installing metal-stud walls on this project.

using this formula per book solution:

Productivity rate= (average cycle time)(productivity factor)(crew size) / (System efficiency) (quantity per cycle)

Question: how do i calculate the productivity factor and system efficiency? Are there assumptions i need to make or charts to reference?

Thanks Eva

Explanation / Answer

Productivity Factor is the ratio of total output to total input.

Here, the total output is the 8 foot high wall whereas the total input will be the number of man hours used to have the work done.

Productivity Factor = Total Output / Number of man hours = 8 / (8 hrs per day x 2 days) = 8/16 = 0.5

System Efficiency is a measure of production in percentage = 0.5*100= 50%

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