Fire-Retardant Cedar Shakes and Shingles Modern technology now combines the appeal and durability of genuine cedar, plus the safety standards required in fire hazard areas. Cedar Plus provides enduring fire protection with a state of the art treating process. Cedar Plus high quality cedar shakes and shingles are placed in pressure treatment cylinders where fire retardants are injected into the inner cells of the wood. The material then goes through a polymerization process and the fire retardants are locked into the wood fiber. After 10 years of outdoor weathering and regular testing, the treatment has been deemed permanent. Cedar Plus shakes and shingles are tested and certified to Underwriters Laboratories standard UL-790, Uniform Building Code standard 15-2 and National Fire Protection Association standard NFPA-256. Preservative Treated Cedar Shakes and Shingles Virtually Maintenance Free Western Red Cedar, a recognized durable wood species, is now made even more durable with modern treating technology. Now you have long term protection from weather and decay associated with high humidity regions, like the Southeastern United States. Cedar Plus CCA uses high quality shakes and shingles in a preservative treatment process. Bundles of shakesand shingles are placed in pressure treatment cylinders where preservatives are set into the wood cells. The preservative treated wood then goes through a fixing process to ensure long term protection from fungal decay.