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Summary of Proposed Code Change: M1305.1.2.3 – Pulldown Stairs Duty Rating
Context and Proposal Overview
The proposal (RB110-22) seeks to establish a minimum duty rating for pulldown attic stairs to ensure they are robust and safe for regular use, especially in accessing appliances located in attics. The new section, M1305.1.2.3, mandates a minimum duty rating of 350 lbs for pulldown stairs and specifies that they must be installed according to the manufacturer’s instructions.This requirement aligns with standards adopted in certain local codes, such as the City of Houston Mechanical Code, and is supported by ANSI A14.9 – 2019 standards for attic stairways, which establish safety criteria for various load capacities and installation practices.
Specific Code Language (New Text in M1305.1.2.3)
M1305.1.2.3 Pulldown Stairs Duty Rating:Reasoning Behind the Proposal
- Safety and Reliability:
- The minimum 350 lbs. duty rating ensures that pulldown stairs can safely bear the weight of individuals and any tools or equipment they may carry when accessing attic appliances.
- The ANSI A14.9 standard cited covers attic stairways and specifies duty ratings and installation standards, promoting consistent safety and reliability for residential applications.
- Alignment with Established Standards:
- The proposal references the ANSI A14.9 – 2019 standard by the American Ladder Institute (ALI), which includes duty ratings for residential and commercial attic stairways, setting minimum requirements for their design, construction, and installation.
- By adhering to this standard, the IRC provides a clear guideline that builders and inspectors can follow, reducing ambiguity in attic access requirements.
- Cost Impact Consideration:
- The proposal may increase installation costs slightly, as indicated by reference estimates from Bob Vila’s website. Installation costs can range from $340 to $1,240, depending on factors like material, labor, and ladder specifications, with an average cost of $490.
- The cost increase is justified by the enhanced safety and durability provided by the rated pulldown stairs, potentially reducing long-term maintenance and liability.
Implications for Builders and Inspectors
- Builder Compliance: Builders must now ensure that any pulldown stairs installed meet or exceed the 350 lbs. duty rating and follow the manufacturer’s guidelines for proper installation.
- Inspection and Enforcement: Inspectors will need to verify that attic access stairs meet the specified load rating and are installed in line with the manufacturer's instructions, as required by the new section.
This summary captures the essence of the proposed addition, clarifying the duty rating requirement, the referenced standards, and the potential cost implications. Let me know if there’s anything more specific you’d like added or further clarified.