An inspector is reviewing a permit application for a new residential deck. The plans specify a proprietary fastening system for ledger board attachment that is not explicitly listed in the IRC, nor does it have an ICC-ES evaluation report. The manufacturer provides engineering data demonstrating compliance with IRC load requirements. What is the most appropriate action for the building official regarding this fastening system?
- AApprove the system based solely on the manufacturer's engineering data.
- BRequire the applicant to submit additional documentation, such as an independent engineer's stamp, to verify the system's compliance.
- CRefer the applicant to the Board of Appeals for a ruling on the alternative material.
- DDeny the use of the system because it is not explicitly listed in the IRC or an ICC-ES report.
Show answer & explanationAnswer & explanation
Correct answer: B. Require the applicant to submit additional documentation, such as an independent engineer's stamp, to verify the system's compliance.
While manufacturer data is a start, for alternative materials or methods not explicitly covered by the IRC or an ICC-ES report, the building official typically requires a professional engineer's stamp or independent third-party verification to ensure compliance with the intent of the code and safety standards. This falls under the 'alternative materials and methods' provisions of the IRC.
Why the other options are wrong
- A. Relying solely on manufacturer data without independent verification for unlisted systems is generally not sufficient for code approval.
- C. Referring to the Board of Appeals is usually for interpretations of the code or appeals of official decisions, not the initial process for approving an alternative material with provided data.
- D. Denying outright is too restrictive; the IRC allows for alternative materials and methods if proven to be equivalent.
Alternative Materials & Methods Approval
For alternative materials or methods not explicitly covered by the code or an ICC-ES report, the building official may require substantiated evidence of compliance, often including engineering analysis by a registered design professional, to demonstrate equivalency to code-prescribed standards.
- IRC allows alternative materials/methods.
- Requires evidence of equivalency.
- Independent engineering often required.
Memory trick: Alternative means 'Ask for more Assurance.'