Ogden International School Roof Evaluation

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

Consulting Services

Building Science

Building Enclosure

Comprehensive Building Assessment

Design, Construction, and Material Defects

Leakage Investigation & Repair

Chemical Admixtures

Coatings, Adhesives, and Sealants

Fatigue & Fracture

Repair, Restoration, Retrofit

The Chicago Tribune has described the Ogden International school as one of Chicago's more successful public schools.


Project Completion





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