Glossary

The terms behind every program on this site, explained plainly.

Every state page references a construction or mitigation standard — this is where those standards actually get explained.

FORTIFIED Roof Wind & hail · 3 tiers The IBHS construction standard behind 9 of the 12 programs tracked here — what it requires and why states pay for it. Zone Zero Wildfire · 5-ft buffer The rule at the center of California's wildfire hardening requirements and grant program.