Building Design and Construction Handbook - Merritt - Ventech!

CONSTRUCTION PROJECT MANAGEMENT 17.31
FIGURE 17.13 Purchasing log lists every subcontract and purchase order after its submission
to a subcontractor or vendor.
gress; dates for required delivery; fabrications and approvals; percent of completion,
both planned and actual; and time relationships of the various trades. Copies of bar
charts may be distributed to subcontractors, trade supervisors, and in many cases
laypeople, with the expectation that it will be easily understood.
Steps in preparation of a bar chart should include the following:
1. On a rough freehand sketch, layout linearly and to scale horizontally the
amount of time contemplated for the total construction of the job, based on either
the contract or past experience.
2. List in the first column all the major trades and items of work to be performed
by the contractor for the job.
3. Based on past experience or on previous bar charts that give actual times of
completion for portions of past jobs, block in the amount of time that will be needed
for each of the major trades and items of work, and indicate their approximate
starting and completion date in relationship to the other trades on the job.
4. On completion of Step 3, reexamine the chart in its entirety to ascertain
whether the total amount of time being allocated for completion is realistic.
5. After adjusting various trades and times of completion and starting and completion
dates on the chart, work backward on dates for those trades requiring fabrication
of material off the site and for those trades that require approval and submission
of shop drawings, samples, or schedules.
6. Block in the length of time necessary for fabrication and approval of items
requiring those steps.
7. Using the contractor’s trade-payment breakdown or schedule of payments for
each trade and month-by-month analysis of which trades will be on the job, sketch
in the percent-completion graph across the face of the chart.
8. After the chart has been completely checked and reviewed for errors, draw
the chart in final form.