SDCI published a new Code Interpretation R302.2 Townhouse Unit Separation on March 15, 2021. The purpose of the Code Interpretation is to clarify methods to provide separation between townhouse units designed to the 2018 Seattle Residential Code. Typically, the code requires a fire-resistance-rated wall assembly to provide continuous separation between units from foundation to roof. There are several conditions where separation is required to extend beyond this enclosed floor area. Examples include covered balconies, alcoves, and canopy or roof projections. In these cases, the Code Interpretation allows for flexibility by providing alternatives to provide continuous separation other than extending the unit separation wall. We recommend reviewing the available options for providing separation early during the design process to avoid required design changes later.
For questions about this new Code Interpretation, please contact: