The 25% rule is a common building code guideline enforced in many jurisdictions (frequently derived from international residential building codes) dictating that if more than 25 percent of a roof's total surface area is damaged or repaired in a single storm or event, the entire roof must be completely stripped and replaced to meet current building standards rather than just patched. This ensures structural uniformity, proper decking compliance, and adherence to modern wind-load requirements across the whole roof plane.
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