Multnomah County Central Courthouse

OBJECTIVE / BACKGROUND

This project was designed and constructed using the integrated project delivery (IPD) process with SRG Partnership, Inc. in collaboration with CGL Architects and Hoffman Construction. PRC was hired by Hoffman to perform periodic quality assurance inspections during the installation process for roof systems on this unique project, which included adaptive reuse of the historic Jefferson Station building.

STRATEGIES & SERVICES

PRC observed and reported on installation of components of the various roof systems, including surface preparation at concrete decks. A composite hot fluid-applied rubberized asphalt membrane system (that included a welded thermoplastic sheet protection course adhered in hot rubber) was used in a protected membrane assembly with insulated overburden and ballast pavers at the main roof area, while a conventional fully adhered single-ply thermoplastic membrane system was used on the roof area covering Jefferson Station and a cold fluid-applied PUMA membrane system was used on roof areas covering projecting bays. Timely field reports were submitted to Hoffman, showing progress and identifying conditions requiring corrective action, tracking each issue for resolution as work moved forward.

OUTCOMES

In addition to inspection duties, PRC was also responsible for testing moisture content of new concrete decks and testing wind uplift resistance of the adhered vapor retarder on the existing Jefferson Station concrete deck to qualify the substrates to receive the new roof systems.