New Building Code Requirements for Asphalt Shingle Roof Installations Effective March 31, 2025
Updates include new requirements for impact resistant ratings for asphalt shingles per IBC Section 1504.8.1 and IRC Section 905.2.4.2
Contractors,
We want to ensure that you are aware of important changes to the building codes that will take effect on March 31, 2025. View the recently approved Boulder County Building Code Approved Amendments
Of particular importance for contractors involved in roof installations, these updates include new requirements for impact resistant ratings for asphalt shingles that we wanted to bring your attention to.
Per IBC Section 1504.8.1 and IRC Section 905.2.4.2 Impact resistance of asphalt shingles:
Asphalt shingles shall be Class 4 impact resistant, tested in accordance with UL 2218, and installed in accordance with the manufacturer’s installation instructions.
Exception: If the roof repair, roof replacement, roof recover, or new roof area of an addition is no greater than 200 square feet in area, and no greater than 25% of the total roof area, the applicant may submit a written request to the Building Official for a code modification. This request must be accompanied by a written statement from a roofing contractor or roofing material supplier that there are no class 4 impact resistance shingles available of similar color or style, and that the proposed shingles are the highest class of impact resistant shingles available that match the color or style of the existing shingles. This request must also provide a drawing that indicates the size of the total roof area for the structure, and the area of proposed work.
These requirements will apply to all permits submitted through our online portal on or after March 31, 2025. Please note that projects that wish to be reviewed under the current 2015 I-Codes and amendments must have a completed request for application submitted online by 4:30 p.m. on Friday, March 28, 2025.
Thank you,
Ron Flax
Deputy Director / Chief Building Official
Boulder County Community Planning & Permitting
2045 13th St., Boulder, CO 80302
Direct: 720-564-2643 | Main: 303-441-3930
rflax@bouldercounty.gov
Boulder County wants to ensure that everyone has equal access to our programs, activities, and services. To request an Americans with Disability Act (ADA) accommodation, please email ada@bouldercounty.gov, or call 303-441-1386. If you need help in another language, please email cppfrontdesk@bouldercounty.gov or call 303-441-3930.
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