Weather-exposed sections of cedar shakes and shingles underwent a rigorous and unprecedented series of tests by Underwriters Laboratories at intervals of 1,2,3,5 and 10 years, after which the product was deemed permanent. The permanence of the treatment later was confirmed after a decade of intense testing by the U.S. Forest Products Laboratory. Moreover, the inherent benefits of the natural product beauty, durability, strength and texture "has not been adversely affected by the fire treatment"....