State-by-State Roofing Code Requirements for Insurance Supplements

Why State Codes Matter for Supplements

The International Residential Code (IRC) sets a national baseline for roofing requirements. But every state adopts the IRC with amendments — and some states have substantially different requirements that directly affect supplement amounts.

Knowing which version of the code your state has adopted, and what amendments apply, is the difference between a $2,000 supplement and a $5,000 one.

How to Cite State Code in a Supplement

When supplementing a state-specific code item, your letter should reference:

1. The base IRC section (e.g., IRC R905.1.2) 2. The state's adopted code version (e.g., "Florida Building Code, 8th Edition") 3. The state amendment number if applicable 4. The specific requirement that mandates the line item

Key States and What to Know

Texas

Texas has adopted the IRC with local amendments. Key supplement items:

Drip edge — Required per IRC R905.2.8.5 as adopted by Texas

Ice and water shield — Required in valleys; northern Texas counties may require eave coverage

Hail-rated shingles — Some local jurisdictions require Class 4 impact-resistant shingles for reduced insurance premiums; this can trigger an upgrade supplement

Texas-specific note: Texas Department of Insurance has strict guidelines on what adjusters can and cannot exclude. O&P disputes are common.

Florida

Florida Building Code (FBC) is one of the most demanding in the country after Hurricane Andrew.

Secondary water barrier — Required on all new or replacement roofs in Wind Borne Debris Regions

Enhanced fastening — Higher nail count and penetration requirements in high-wind zones

Starter strip — Required per manufacturer specification

Florida-specific note: The secondary water barrier requirement alone adds $800–$2,000 to a typical supplement.

Colorado

Colorado's hail climate makes it a high-volume supplement state.

Class 4 IR shingles — Many Colorado insurers have started writing Class 4 requirements into policies; this can support upgrade supplements

Ice and water shield — Extended coverage requirements in mountain regions

Steep slope charges — Mountain properties frequently trigger steep slope labor supplements

Minnesota

Minnesota's climate creates some of the strongest supplement arguments in the country.

Full ice and water shield coverage — Minnesota requires ice and water shield coverage at eaves extending beyond the exterior wall line; many states only require 24 inches

Ventilation — Minnesota's 2020 code updates tightened attic ventilation ratios; this triggers ventilation supplements on older homes

Snow load fastening — Enhanced fastening requirements in heavy snow areas

California

California has adopted the 2022 CBC (California Building Code), which includes significant wildfire-related amendments:

Class A fire-rated roofing — Required in High Fire Hazard Severity Zones (HFHSZ)

Ember-resistant vents — Required at eaves and rakes in HFHSZ

Georgia

Georgia AMC (Amendments to the Minimum Standards Code) — Adopt IRC 2018 with amendments

Ridge cap — Manufacturers require separate ridge cap material; Georgia adjusters frequently bundle with field shingles

How EstimateDelta Handles State-Specific Codes

[EstimateDelta](/pricing) applies state-specific code logic automatically. When you upload a Florida estimate, it checks for the secondary water barrier. When you upload a Minnesota estimate, it checks for full ice and water shield coverage.

You don't need to know every state's code amendments. EstimateDelta does.

[Analyze an estimate for your state →](/pricing)