Labour is on site and nobody records what it did
Hours are paid, allocation is guessed, and any disruption claim later has nothing underneath it.
What's happening?
The timesheets prove the hours were paid; nothing proves what they were spent on. When productivity is lost - the gang moved, the area not ready, the work out of sequence - the cost lands in the labour account and vanishes there, because paid hours and productive hours look identical in the records the business actually keeps.
Disruption money is won and lost on allocation: hours against activities and areas, recorded daily, so the difference between planned and actual effort on an activity can be shown rather than asserted. A claim built on allocation sheets reads like arithmetic - this activity, this many extra hours, this cause noted that week. A claim without them reads like an opinion about how hard the job felt.
The solution
Hours against activities, written down the day they're worked.
If you would rather it were done for you, Site Records & Progress Capture is the service that does it.