The twenty-five percent rule in roofing refers to a common regulatory requirement found in many regional building code jurisdictions concerning major roof repairs versus complete overhauls. Specifically, the rule mandates that if more than twenty-five percent of a roof's total surface area is damaged, destroyed, or requires structural repair within any twelve-month period, local building departments require the entire roofing system to be completely stripped down and replaced to comply with current modern building, wind-resistance, and energy-efficiency codes rather than allowing partial patch-ups on an aging structure.
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