Exterior Weathering Durability of Some Leach-Resistant Fire-Retardant Treatments for Wood Shingles: A Five-Year Report

摘要

As a part of a continuation study on fire-retardant treatments for wood shingles and shakes, shingles were treated by systems selected from previous research, including commercially treated class C shingles, and exposed outdoors for 2, 5 and 10 years. This is a progress report after 5 years' exposure and fire testing by burning brand and modified Schylter tests. Generally acceptable results were obtained after 2 years' exposure, except for a reference pyresote treatment. After 5 years' exposure, all systems passed 80 percent or more of the burning brand tests except for the pyresote and the pyresote with light sealer coating. All systems showed weakness in the Schlyter, but in four of the eight systems flames on shingles were self-extinguishing. (Author)