An extension of time is tested against records made during the delay
A claim for more time turns on three separate questions. Was the contract's notice procedure satisfied? Is the event one for which the contract allows an extension, or whose risk it otherwise places on the employer? Did it actually delay completion? Money is a separate claim, with its own proof of causation and amount. Each question is later tested against what was written down while the event was happening, by whichever party has to prove the point. Records do not create entitlement, a record of an event does not prove that it delayed completion, and the prevention principle does not rescue a claim under every contract or every governing law.
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