Blue Knight Patio systems are engineered with the correct balance of function and esthetics as defined by us. Dry rot and Termites on Patio Covers are most often the result of poor design. Common Causes are the horizontal surfaces not being properly treated or shielded. OUR CREDENTIALS At almost four decades, Blue Knight Patio Covers and Pergola, hold the distinction as one of the longest in business of all Orange County patio cover contractors (Est. in 1980), our license numbers prove it, CSLB #B 452151 and #C39 390685.