IRC and Local Residential Roofing Codes

The International Residential Code (IRC) is the national standard for residential construction. Chapter 9 covers roofing, with requirements for decking, underlayment, Ice & Water Shield, ventilation, and wind/fire resistance.

Short answer, we are the only game in town that delivers address specific IRC data. You can purchase and browse the IRC codes online from the International Code Council (ICC). OneClick Code simplifies this by delivering location-specific IRC interpretations directly in your code reports.

It depends on your Authority Having Jurisdiction (AHJ). Typically the city or county building department. With OneClick Code, just enter the property’s address, and the system instantly pulls all relevant IRC and local building codes. Guesswork, gone.

Yes. OneClick Code provides residential roofing codes tied to the IRC as well as commercial roofing standards tied to the IBC (International Building Code).

Contractors often lose time tracking down which codes apply in which jurisdictions. With OneClick Code, you enter the project address and get an instant report showing the correct IRC sections, local building codes, and any state-level amendments tied to that exact Authority Having Jurisdiction (AHJ). No more juggling PDFs or calling building departments.

The International Residential Code (IRC) is a model building code developed by the International Code Council (ICC). Most states adopt the IRC as their baseline and publish their own minimum building codes. Local jurisdictions (cities and counties) often add modifications for wind loads, snow loads, sheathing requirements, or permit thresholds. OneClick Code connects these layers automatically by location.

Code upgrades are a major driver of cost. Using outdated requirements can cause adjusters to reject line items or force expensive tear-offs after inspections. OneClick Code gives contractors and estimators defensible reports that align with the current code requirements in that jurisdiction, protecting profitability and ensuring compliance.

Building departments or other state agencies serve as the Authority Having Jurisdiction (AHJ). They enforce building codes by reviewing plans, issuing permits, and performing inspections to protect public safety and general welfare. OneClick Code reports include the correct AHJ for every property address.

Key sections include:

• IRC Chapter 9 (R905) for roof coverings (asphalt, metal, tile, etc.)
• R905.1.2 / R905.2.7 for Ice & Water Shield (IWS) requirements
• R806 for attic ventilation
• ASTM D7158 / D3161 for asphalt shingle wind and fire resistance ratings
  Depending on the material, other standards (UL, ASTM, or manufacturer specifications) may apply. OneClick Code shows all specific requirements tied to your project address.

Yes. OneClick includes energy code requirements, such as those found in the International Energy Conservation Code (IECC), where adopted by the jurisdiction. This includes ventilation, insulation, and energy conservation provisions. You can use the Ventilation Calculator to ensure compliance with code-specified minimums on every job.