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Centennial Slate roof shingle simulates the natural color variations of true blended slate at a fraction of the cost. Centennial Slate utilizes CertainTeed's Super Shangle construction with two full-size, 18'' x 36'' base shingles, resulting in four layers of shingle protection and 8'' exposure when applied. The shingle is available in six colors, is algae-resistant, features Class A fire rating, and meets ASTM D3462, a tough shingle performance standard required by many of today's building codes. CertainTeed, Valley Forge, Pa. www.certainteed.com circle 211 For more information, circle item numbers on Reader Service Card or go to www.archrecord.com, under Products, then Reader Service.