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Posts tagged with building code Archives - Building Connections

New Code Interpretation for Fire Wall Continuity at Offsets

January 3, 2023

Fire walls are the most robust form of fire-rated assemblies in the Building Code and have strict rules for their construction and continuity. In Seattle, fire walls are being used more frequently for a variety of reasons, including: Fire walls are required for compartmentalization when building 6 stories of wood construction using the Seattle amendment to promote more affordable housing (SBC 510.10); and Fire walls are used to subdivide a building into separate “buildings,” either to change the occupancy designation or to separate new construction from existing.

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Revised Policy for Use of Fire Walls in Lieu of Substantial Alterations

April 5, 2022

Substantial alterations are a part of the Seattle Residential Code (SRC) that is applied when a large percentage of the house is being renovated or a large addition is being constructed; SRC Section R107.9. The requirements of substantial alterations are to update the house to the current code for major life safety items of fire, egress, and seismic. Substantial alterations may be required when an attached accessory dwelling unit (AADU) is created as an addition to an existing house. Traditionally, SDCI has given a break from substantial alterations when an AADU is being created in an existing house to support the housing need in Seattle, though this break has not been given when a new addition to a house is for an AADU. Recently, SDCI has revised the policy to allow fire wall construction in compliance with Seattle Building Code 706 to separate a new addition from an existing dwelling unit per SRC 107.5.

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