R310.1.1 Minimum Removed redundant language in the Exception for minimum opening area net clear opening of 5 square feet for glazing in grade floor openings. R313.1 Townhouse Allows two 1-hour fire-resistance-rated wall assemblies that Automatic Fire comply with Table R302.1 in lieu of a common 2-hour Sprinkler wall assembly. Systems R314.3 Location Amended to also require smoke alarms in habitable attics (finished) but not uninhabitable (unfinished) attics, and uninhabitable (unfinished) attic stories (Effective date January 1, 2012) R315.1 Carbon Exceptions provided for exterior renovations, door and monoxide window replacement and deck and porch additions that do alarms not require installation of CO alarms. R315.3 Alarm CO alarms that are battery powered, plug-in, or hard-wired requirements are acceptable for use. R322.2.1 Elevation Removed the requirements 1’ freeboard requirements R322.3.2 Elevation Removed the requirements 1’ freeboard requirements
R310.1.1 Minimum opening area Removed redundant language in the Exception for minimum net clear opening of 5 square feet for glazing in grade floor openings. R313.1 Townhouse Automatic Fire Sprinkler Systems Allows two 1-hour fire-resistance-rated wall assemblies that comply with Table R302.1 in lieu of a common 2-hour wall assembly. R314.3 Location Amended to also require smoke alarms in habitable attics (finished) but not uninhabitable (unfinished) attics, and uninhabitable (unfinished) attic stories (Effective date January 1, 2012) R315.1 Carbon monoxide alarms Exceptions provided for exterior renovations, door and window replacement and deck and porch additions that do not require installation of CO alarms. R315.3 Alarm requirements CO alarms that are battery powered, plug-in, or hard-wired are acceptable for use. R322.2.1 Elevation requirements Removed the 1’ freeboard requirements R322.3.2 Elevation requirements Removed the 1’ freeboard requirements