A building official receives a permit application for a new residential dwelling. The proposed design incorporates an alternative material for the foundation insulation that is not explicitly listed in the IRC. The applicant provides engineering data and test results demonstrating the material's equivalence to code-compliant options in terms of thermal performance and durability. According to the IRC, what must the building official do regarding this alternative material?
- AReject the application immediately, as only prescriptive code materials are allowed.
- BApprove the use of the alternative material if its performance is proven equivalent to code requirements.
- CRefer the decision to the Board of Appeals for their initial review.
- DRequire the applicant to obtain a variance from the local governing body.
Show answer & explanationAnswer & explanation
Correct answer: B. Approve the use of the alternative material if its performance is proven equivalent to code requirements.
The IRC allows for the approval of alternative materials, designs, and methods of construction, provided the building official finds that the proposed alternative is satisfactory and complies with the intent of the code, and that the material, method, or work offered is, for the purpose intended, at least the equivalent of that prescribed in the code in quality, strength, effectiveness, fire resistance, durability, and safety.
Why the other options are wrong
- A. The IRC specifically allows for alternative materials if proven equivalent.
- C. The Board of Appeals is for appeals of decisions, not for initial review of alternative materials when adequate data is provided.
- D. A variance is for deviations from code requirements, not for approving equivalent alternative materials.
Alternative Materials, Design, and Methods of Construction
Provisions in the code allowing the building official to approve materials, designs, or methods not specifically prescribed, provided they are proven to be equivalent to code requirements.
- Requires satisfactory proof of equivalence.
- Building official makes the determination.
- Must meet intent of the code regarding quality, strength, effectiveness, etc.
Memory trick: Innovation is possible if you can prove it's just as good, or better.