Why the library is organized this way
A roof estimate is more useful when each uncertainty has a place. Roof area answers quantity. Material pages define the system. Tear-off and decking cover concealed work. Flashing and ventilation cover critical details. State pages provide location context. The quote tool checks whether contractors are pricing the same scope.
This structure avoids publishing dozens of near-duplicate keyword pages. New location pages should add documented local information, not just swap a city name.
Workflow: measure → calculate → inspect scope → compare quotes → replace assumptions with local written pricing.