Location: Walla Walla, WA

Date: 2025

Project Keywords: On-Call Project, Roof Replacement

Project Description:
Under an on-call project agreement with the Department of Enterprise Services, KMB led the design for a complete replacement of three interconnected roof systems serving a residential housing unit, communal dayroom, and entry vestibule at the Washington State Penitentiary. The replacement addressed both functional upgrades and long-term performance enhancements for the building envelope and mechanical systems.

The design incorporated new high-performance insulation, a robust vapor retarder, updated single-ply membrane roofing, metal flashings, and redesigned drainage systems to improve water management and extend the service life of the roof assembly. Masonry parapets were seismically reinforced to enhance resilience in alignment with current code requirements.