Building Component Safety Information (BCSI)
Structural Building Components Association
Produced by Structural Building Components Association, the BCSI is the truss industry's guide for jobsite safety and truss performance. This edition includes the most current information regarding the handling, installation, restraining and bracing of metal plate connected wood trusses.
BCSI also includes information and guidance pertaining to diagonal bracing for web members with two rows of lateral restraint, as well as permanent lateral restraint and diagonal bracing guidance for trusses spaced wider than 2' o.c.
Although the IRC is a model code, each state adopts it differently. While some states adopt the code in its entirety, others choose to select parts that they like and use them to augment their state code. In some states, the adoption process is managed at the local city or county level, while in others, it is a statewide adoption process.
It is important to note that a code appendix is not automatically adopted along with the rest of the code, and its adoption may vary by state or municipality. Appendix AQ, in particular, is a model building code that provides building safety standards for both foundation-based and movable tiny houses that are 400 square feet and under.
This code appendix addresses various issues related to safety and efficient design of tiny homes, which is especially important for such small structures. It allows for compact stairs, including handrails and headroom, ladders, reduced ceiling heights in lofts, and guard and emergency escape and rescue opening requirements of lofts. Appendix AQ provides a pathway for tiny homes to be allowed as primary residences or accessory dwellings units through local zoning.
Adoption of Appendix AQ into the residential building code is up to each state and/or municipality. When adopted, it can encourage local zoning jurisdictions to be more open to the idea of tiny homes as primary residences or accessory dwelling units because they have an ICC-approved code to build those types of dwellings.
In conclusion, the International Residential Code, along with its appendices, serves as an essential guide for safe and efficient residential construction. The adoption of Appendix AQ for tiny homes can promote more sustainable, affordable, and flexible housing options in communities across the US.
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