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Task A is the erection of the framing. This 10 day activity involves 2 days to set out the walls and fix the head and floor tracks and 8 days to fix the rest of the studs and frames.
Task B is the in-wall services rough-in. This involves a total of 3 days work by electricians, plumbers and others to run their pipes and cables inside the wall ready to connect to fixtures and fittings at a later date. This task can start 4 days after Task A has started (this allows time for the framers to have installed around 25% of the studwork) but cannot finish until 1 day after all of the framing is installed.
By its nature this work is interrupted requiring several short visits to the floor by each of the services trades.
Task C is the fixing of the wall sheeting. This can start one day after the ‘in-wall services rough-in’ has started and needs 3 days to finish after the last of the services are installed in the wall. The three days allows sufficient time to fix the last sheets, finish setting the joints and on the final day complete the sanding of the joints. However, fixing, setting and sanding the wall sheeting will take 12 days overall. Progress on the wall sheeting is only partly dependent on the in-wall services because not every wall has services inside it and as long as the service trades have access to one side of the walls where there are internal services, the sheeting can be installed on the other. The sheeting also needs at least 3 days after the completion of the framing (Task A) before it can finish.
The situation in Figure 2 (below) represents the optimum situation. Task B starts 4 days after Task A allowing Task C to start one day later. Task B finishes 1 day after Task A allowing Task C to complete 12 days after it started. The overall duration of this work is 4 days at the start of Task A, plus 1 day at the start of Task B plus the full 12 days for task C equalling 17 days work.
It is possible to show interrupted tasks in Asta Powerproject by using a feature called interruptible tasks. By using normal tasks (as can be found in most planning systems) the programme would look like this: However by setting Task B as ‘Interruptible’ by right clicking on it and selecting ‘Make Into..Interruptible’ and then
Rescheduling the project we get the desired result: The difference between the two programmes is that Programme 1lasts 21 days and Programme 2 lasts 17 days and is an accurate reflection of what is happening on site.
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