Basis for effective age determination
What it proves. Depreciation is age divided by useful life. Effective age is a judgement and an undocumented one is where most of the disagreement in an ACV dispute sits.
Where it comes from. Roof or system installation records, permit history, prior inspection reports, or a contractor's condition assessment.
Age/life tables relied upon
What it proves. Names the source for useful life so the number is traceable rather than asserted. Different tables give materially different answers.
Where it comes from. Published depreciation guides, the carrier's own tables where disclosed, or manufacturer's stated service life.
Documentation of any recoverable depreciation held back
What it proves. Identifies the second payment you are owed once repairs complete and starts the clock on any statutory window for collecting it.
Where it comes from. The carrier's estimate and payment worksheet, which should show ACV paid and depreciation withheld as separate figures.