Building Cancer

Currently the roof structures on at least 1,000 low-rise mixed-occupancy commercial buildings nationwide are at-risk of extensive damage and possibly collapse unbeknownst to anyone in spite of annual visual inspection and customary maintenance. The cancer-like decay and corrosion that is destroying these roofs is caused by the use of green or wet wood during construction, reliance on sealants instead of flashing and counter-flashing of roof seams and penetrations, the hidden spread of small water leaks along the joints between roof panels, inadequate ventilation below insulated roofs, and seasonal roof inspections that fail to actually examine the roof structure and instead examine only the built-up roof membrane on top of the roof structure and the insulation on the underside of the roof structure. In terms of repair costs and lost rent for the average affected building, this represents a two-million dollar expense. In terms of potential injuries, the cost is incalculable. The forensic investigation of two such buildings is a lesson for all.