What are the two key factors in rating Post-FIRM buildings?

The primary elements in rating Post-FIRM (Flood Insurance Rate Map) buildings are the FIRM Zone and the elevation of the lowest floor of the building. The FIRM Zone designates the flood risk level assigned to a specific area as determined by the NFIP, guiding the standards for flood insurance and construction. Understanding the zone helps in assessing the building's flood risk and insurance premium.

The lowest floor's elevation is crucial because it directly influences whether the building is above or below the base flood elevation (BFE). This elevation measurement is vital for determining the insurance cost, as higher elevations typically result in lower premiums due to reduced risk of flood damage. Thus, both the FIRM Zone and the lowest floor's elevation are essential factors that directly affect how flood risk is calculated and subsequently how buildings are rated for insurance purposes.