CTLGroup assisted with identifying the cause(s) of delamination of the hot rubberized asphalt waterproofing that had been installed on the Ogden Public School green roof. CTLGroup identified that the source of the loss of bond was caused by excessive moisture in the concrete slab prior to installation of the waterproofing membrane.
Loss of bond in roof materials is an industry wide problem that is exacerbated by new lightweight cementitious materials, which retain large amounts of moisture. Accelerated project schedules that do not allow sufficient time for roof decks to dry prior to roof membrane installation is an additional contributor to this problem.
CTLGroup worked with the builder, architect, owner’s representative, and roofer to help identify proper conditions for the placement of the hot rubberized asphalt waterproofing membrane. CTLGroup has published articles regarding this industry-wide problem.
Buildings & Facilities
Comprehensive Building Assessment
Design, Construction, and Material Defects
Leakage Investigation & Repair
Coatings, Adhesives, and Sealants
Fatigue & Fracture
Repair, Restoration, Retrofit