HOT-APPLIED SHEET SYSTEMS - WATERPROOFING

Hot-applied systems are effectively below-grade roofing systems. They use either coal tar pitch or asphalts, with 30-lb roofing felts applied in three to five plies. Waterproofing technology has provided betterperformance materials and simpler applications, limiting ho systems usage to waterproofing applications.

Hot-applied sheet systems have installation and performance characteristics similar to those of roofing applications. These systems are brittle and maintain very poor elastic properties. Extensive equipment and labor costs offset inexpensive material costs. Below- grade areas must be accessible to equipment used for heating materials. If materials are carried over a distance, they begin to cool and cure, providing unacceptable installations.

Properties of typical hot-applied sheet systems are summarized in Table 2.7.