After years of exposure to Southern California's scorching sun, the 76,000-sf modified bitumen roof atop the Southwestern High School in El Centro, Calif., was finally starting to fail. Rather than tear off and replace the existing roof, officials at the Central Union High School District decided to retrofit the system.
The school district consulted with Escondido, Calif.-based roofing contractor Roof Construction, which recommended that a roof board and single-ply “cool” membrane be installed over the existing roof.
Ron Chambers, president of Roof Construction, specified Johns Manville's Invinsa roof board as the separator between the existing cap sheet and the JM PVC-60 “cool” roof single-ply membrane. The system complies with California's Title 24 energy efficiency regulation.
Chambers said Invinsa saved hours in labor because it's easy to cut and carry—it's one-third the weight of traditional cover board. As a result, Chambers was able to reduce the crew size from eight to six over the six-week installation.
Johns Manville
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