SDCI updated the Code Interpretation entitled R302.2 Townhouse Unit Separation on February 1, 2022. The purpose of the Code Interpretation is to clarify methods of providing separation between townhouse units designed to the 2018 Seattle Residential Code. The update provides information about when Figures R302.2(1) and R302.2(2) can apply. We recommend reviewing the available options for providing separation early during the design process to avoid required design changes later.
Many new Seattle residential buildings include private balconies for each unit. Although they may be outside of the building envelope, where these balconies are covered by a roof or by the floor of the balcony above, they are considered floor area, and must comply with fire-resistance and separation requirements in the Seattle Building Code. To help architects and others, SDCI has recently released two Code Interpretations on this topic.