What to consider
Record when the problem appears and show earlier repairs. An inspection can include tiles, flashings, windows, valleys and internal moisture. Temporary protection and permanent repair are separate steps; keep a follow-up point if the cause remains uncertain.
Apply this to your roof
Record your preferences in the roof plan. Final dimensions, product suitability and the complete build-up are assessed for the actual roof; keep the agreed details and manufacturer instructions with your project documents.