ABSTRACT
A roofing contractor friend called us out to investigate a puzzling series of roofing failures involving his best client’s roughly 18,000 m2 (~2000 square) roof.
The entire building is steel framed with bar joists and a steel deck supporting a roofing system with the following bottom-to-top construction:
• A mechanically fastened layer of composite insulation. The insulation is composed of 70mm (2¾in.) thick isocyanurate foam and 13mm (½in.) thick perlite/wood fiber in square panels 1.22 m (4 ft) on a side.
