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Slate Look. CertainTeed’s Highland Slate is a single-layer fiberglass shingle that duplicates the texture and color of natural slate. The four-tab 18-by-36-inch shingles are rated for high-wind zones (an impact-resistant version is also available) and come in six colors. They cost about $130 per square. CertainTeed Corp., 800/233-8990, www.certainteed.com