Developing Innovative Solutions in the Building Industry

Cercorp Initiatives Inc.

The FlexLock Wall System

The FlexLock Wall System

Cost Analysis

A Comparative Cost Analysis Between FlexLock and Standard CMU Masonry

C. Establishing Productivity Rate For FlexLock

Prior to the build, a study was performed and, based on established industrial engineering methods, a productivity rate was developed. This rate is based on Normal Time which is the average observed  performance time to stack a single FlexLock unit taking into account the performance rating of the stacker. Normal Time is not directly used for establishing labor costs, but acts as a a time-study reference point necessary to determine accurate labor costs. The formula for Normal Time is as follows:

NT = (CT) x (PR )

NT = Normal Time

CT = Cycle Time (the time it takes to stack one unit)

PR = Performance Rating (quality of the performance based on skill and experience

expressed in a percent with 100% being an average worker)

Normal Time: To establish the Normal Time for FlexLock, the per unit cycle was broken down into specific tasks and each of these were observed in a realistic work situation. The following times are taken from time studies conducted at the International Masonry Institute in April and June of 2003. The control structure was three wall panels and a small FlexLock structure with window and door openings

NT = (CT) x (PR)

20 = 20 x 1

Standard Time: Normal Time provides a basis for determining the actual "real world" time it takes to stack FlexLock. This "real world" time is called Standard Time, which is an industry benchmark used to accurately determine labor costs. Simply put, Standard Time is Normal Time adjusted for any planned non-productive time known as Allowances. Allowances are work delays that include: bathroom visits, drink, physical or mental strain, tediousness, as well as heat and humidity. Other unplanned work stoppages such as late shipments or rain delays are not calculated in labor costs. An Allowance Factor of 7% to 9% is considered
an industry standard.