Stone Cliff Seismic Retrofit

Project Overview


Bank Lending requirements called for a reduction in the probable maximum loss (PML) of this unreinforced masonry building (URM) in the bell town area of Seattle.


To achieve the required PML rating; through wall bracing (exterior rosettes) were added every two feet and a new roof diaphragm was added. To complete the project interior lead based paint impacted lathe and plaster walls were removed. Due to the need for the new roof diaphragm a new 60 mil TPO roof was installed over the new framing and existing roofing. The project was completed with only minimal loss of residents due to the construction in the building.

  • Upgrade providing a PML rating of 19% at completion
  • Rosettes on exterior
  • Wall to Roof Parapet bracing
  • Wall to Floor bracing utilizing bolts plus method
  • Membrane roof replacement
  • Repointing (restoring grout lines on brick)
  • Seismic upgrade/minimal inconvenience to tenants
  • Cale Ash, PE Associate Principal, Degenkolb Engineers
  • Type: Seismic Retrofit

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