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The results of the first five years of a 10-year field evaluation on three modified bitumen roofing systems at Fort Polk, LA are presented. This work is part of a research effort being conducted by the U.S. Army Construction Engineering Research Laboratories (USACERL) to investigate long-term performance of single-ply membrane roofing materials.
In 1987, three different modified bitumen roofing systems were installed on Building 920 at Fort Polk: a torch-applied atactic polypropylene (APP), a hot-mopped styrene-butadiene-styrene (SBS) and a self-adhering SBS membrane. At the time of installation, the roof membrane materials were tested for initial properties to provide a basis for comparison with later samples. Test samples for each roofing system were taken during the initial installation and at years 1,2,3, and 5. A total of nine tests measuring mechanical and physical properties of the membranes were performed on each of the sets of samples. The properties being evaluated were those considered essential to good roofing performance. For most properties, American Society of Testing and Materials (ASTM) standard test methods were used. In addition to the membrane testing, the roofs have been visually inspected once each year. Preliminary findings indicate that the test roofs are performing well.
field performance, low-slope roofing, membrane properties, modified bitumen, service life, single-ply roofing, roofing
Principal Investigator, U.S. Army Construction Engineering Research Laboratories, Champaign, IL
Research Chemist, Center for Building Technology, National Institute of Standards and Technology, Gaithersburg, MD
Senior Research Technician, Center for Building Technology, National Institute of Standards and Technology, Gaithersburg, MD