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The section is revised to require at least one king stud is needed each end of a header in addition to required jack studs. A section is added requiring an exterior door be provided at the top of stairs enclosed with breakaway walls and providing access to the dwelling.
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Changes include new floor joist and beam span tables, allowable post sizes and other construction details. Revises the retaining wall definition and provision and requires a foundation wall to be supported at both the top and bottom prior to backfilling.
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The existing table of minimum footing widths, Table R403.1, is replaced with a new, expanded, engineering-based table that reduces the minimum footing width for many common one- and two-story dwelling foundations. This change adds 23/32 wood structural panels as an acceptable alternative for thermal barrier protection. It also introduces exceptions from requiring carbon monoxide detectors, based on the same exceptions found under smoke alarms. This change is a complete rewrite of the section to match the format for smoke alarms.
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This change includes clarification when an emergency escape and rescue opening is required in existing dwellings and additions.
#Irc 2015 windows
This change limits the requirement for glazing at the bottom of a landing by excluding windows greater than 180 degrees from the bottom face of the landing.
#Irc 2015 download
Download the report 2015 ICC Model Codes: Summary of Important Changes for more details. In collaboration with the National Multifamily Housing Council, National Apartment Association and BOMA International, NAHB released a report regarding the significant changes to the 2015 ICC model codes.