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Lightweight Stone. Although BellaStone looks remarkably authentic — thanks to the real stone used in the manufacturing process — the 50-inch-by-24-inch panels weigh a fifth as much as traditional stone and install 50 percent faster, says the maker. The panels have sound-deadening properties and an R-value of at least 2.5, and are sold in three color blends. Installed costs average $12 per square foot. Exterior Portfolio by Crane, 800/ 366-8472, exteriorportfolio.com