In the last article, we discussed the creation of a list of work items for a construction schedule. In this article, we discuss the creation of a flow chart of work items.
Before we begin, I would like to make some comments about commercially available scheduling programs, including Microsoft Project. These programs are based on the Critical Path Method (CPM) scheduling process, which was developed before the widespread use of computers. CPM is a great tool.
Using method-based programs is complicated. When we tried to switch to one of these programs, we found that we spent much more time updating the schedule than running the schedule. The update process has often produced unexpected results. Printing the schedule was time-consuming and it was difficult to see the full picture of the print. The titles of these articles contain the word "Simple" and the method I proposed is much easier to create and control.
I've always preferred a low-tech approach that describes each workpiece from one small yellow sticky note, and then arranges the notes in the prepared order. If you do this on a large piece of paper, you can attach the yellow sticky notes with lines and have a flowchart. The advantage of self-adhesive notes is that you can see the whole project as it evolves and move the sticky notes for fixes and modifications.
For the purpose of this exercise, we assume that you complete an operation before starting the next operation. For example, it lists the coarse water pipe; Rough HVAC and coarse electricity in succession, though probably overlapping these elements. In fact, I highly recommend overlapping these professions as they help them work as a team if they know each other. We will adapt to overlaps when we move on to the schedule.
Of course, building a home does not start a single journey from start to finish. When you have finished the interior design and exterior design of the roof, separate roads are needed. Each has its own way to finish. In our case, the interior lasted much longer than the outside
After completing the complete schedule and making sure it means a practical timetable, go back and add the number of days for each workpiece (or sticky note) the number of non-overlapping days in parentheses or other colors.
In the mechanical part of the schedule, the Water, HVAC, and Electrical equipment takes 14 working days if the workpieces are done at the same time, but they can do the work within nine days.
Then complete the non-overlapping days to fill each element in the flow chart, so each workpiece has a starting day. The table above the initial working day appears in bold in the upper left corner.
Now you have to prepare a practical roadmap for building a home, but only halfway. You then need to make sure that all the materials are there when you need it. Returns to the workpiece list and lists for each workpiece the materials that need to be ordered and wait for the lead time. Some items will be obvious, such as doors, windows and cabinets. Some are not so obvious. Do not assume that the items made by the subcontractors are ordered by them. If you use a bath that requires a three-week lead time, it must be listed.
I suggest you order all critical items at the start of the project. Assuming that all the materials are ordered on the first day of the timetable, are there items that do not arrive on time to install? When we started using prefabricated wallcoverings and roof structures, we discovered that in drawing up a drawing approved by the municipality (many people wanted to see blueprints on the grids), it took more time to produce and transport than the foundation. We had to order wall coverings and grids for more than ten days before we started home or we had to wait for the materials. If you grab the flow and the potential lead time problems, you can add boxes to the sticky note (blue boards on the chart). I always add a field to confirm the order of the critical element. To determine if the start is counted from the day required for the item in the workspace.
Assuming that I made all this clear enough to follow, you have to give the complete road map of your typical house construction project. In my next article on scheduling, I will handle this in a simple and usable format.
Original Content Protection 2011 Thomas Robinson