Roof Eval 2012 Clinic Moisture Study.pdf

This is a technical data package containing the results of a roof moisture study conducted by A-Tech/Northwest, Inc. for the Portland Area Indian Health Service at the Chemawa Health Center Clinic Building #-022 in Salem, Oregon (Project #12267, dated December 5, 2012).

The study examined two single-ply roof assemblies (Roof A and Roof B) covering a total of 20,142 square feet. Roof A, comprising 15,289 square feet with a single-ply Duralast mechanically attached membrane installed in 2002, showed 4.55% total wet area (695 sq. ft.) with moisture penetration levels ranging from 0.05% to 4.15%. Roof B, covering 4,853 square feet with a single-ply Duralast membrane installed in 2007, exhibited 2.99% total wet area (145 sq. ft.) with moisture penetration from 0% to 2.95%. Both roofs utilize polyisocyanurate insulation over metal decks and have experienced intermittent interior leakage. The report recommends a planned roof management program (RMP) with regular visual inspections (minimum twice yearly) and electronic moisture studies every 4-5 years. Two long-term options are proposed: Option #1 involves membrane removal, insulation salvage and recovery with additional insulation installation; Option #2 recommends complete removal and replacement. The study concludes the roofs are manageable for the next five years with proper maintenance, with major work anticipated around 2020. The document includes detailed moisture contour maps, photographs, technical specifications on roof construction materials, and comprehensive guidance on repair procedures, material selection, and contractor qualifications for roof maintenance operations.