The NFIP 30-day waiting periodAn NFIP policy generally has a 30-day waiting period before coverage takes effect, with specific exceptions.Elevation certificates: what they documentAn elevation certificate records building elevation and other information used for floodplain management and, in some situations, insurance.How to read a FEMA flood mapStart with the correct effective panel, then locate the building and read the zone, elevation and legend together.LOMA and LOMR-F: how a flood map changesFEMA can amend a map when site-specific evidence establishes that land or a building meets the applicable elevation criteria.What can change your flood zone?Maps change as FEMA incorporates new studies, updated conditions and official letters of map change.