Roofing success with flexible membrane systems. (includes related article on roof expectations of owners)(SPRI Special Report)

A special report co-sponsored by Buildings magazine and SPRI.

Roofing systems are tough guys, enduring some of the most severe environmental stresses from wind, rain, hail, and snow, as well as temperature extremes from 15 below to well over 100. But proven product performance and increased quality control in flexible membrane roofing systems have resulted in even greater compliments from professionals involved in the design, construction, and management of commercial buildings.

"User friendly," is the way one facilities professional describes his seven-year-old system, citing such qualities as lighter weight, relatively safe installation, design flexibility, energy efficiency, and easy inspection and maintenance. Additionally, life-cycle costing for flexible roofing membrane installations provides greater financial returns to building owners than ever before, due, in part, to the systems' product improvement processes. Reinforcement of membranes has resulted in longer-term resistance to punctures, as well as dimensional stability during thermal and wind-induced stress. Attachment concerns have been addressed through either improved chemical compositions in adhesives or re-engineered mechanical fastener systems. System compatibility - deck, insulation, membrane, flashings - is now recognized as key to a successful system.

Flexible membrane systems first made their mark on the United States more than 25 years ago, offering themselves as extremely versatile, durable, and cost-effective alternatives to the traditional built-up roof (BUR). Compounded by an industry that at the time was undergoing significant changes in structural design, and an economy affected by fluctuations in the oil market, these "new kids on the block" quickly won over their skeptics, making such a noticeable impact on the commercial buildings industry that their use jumped from …