Three bids, three lifespans, one price gap. The shingle manufacturer sets most of the rules that decide whether a roof lasts, and almost nobody reads them.
The number printed on a roofing bundle is a test result, not a forecast. Three people adjacent to your decision can translate it, and they will usually do it for free.
Double glazing saves less than most brochures imply and lasts longer than most owners track. The labels, schedules and warranty records that settle both questions.
A regional distributor pulled its ecommerce platform contract apart before the renewal date and found that the clauses that mattered most were the ones added in the last decade.