This important event occurred "after 10 years of testing", enabling the use of cedar shakes and shingles on residential and commercial buildings. Due to size, location or occupancy, buildings are mandated by local building codes to have a Class A, B or C fire-retardant rated roof. The Underwriters test, known as UL-790, is recognized by the International Conference of Building Officials (I.C.B.O.) as UBC Standard 32-7. All Cedar Shake & Shingle Bureau Member pressure-treaters meet the requirements of UBC Standard 32-7. At this time, we are unaware of any after market fire retardants which are permanent or effective and not subject to frequent re-application.