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What Is Stone Wool? This Eco-Friendly Insulation Repels Fire And Water

By Kristin Hunt

You're probably familiar with fiberglass insulation, the bright pink material that lines the walls of so many homes. But what about stone wool insulation?

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While fiberglass insulation is made with recycled glass, stone wool (also called rock wool or mineral wool) is even more sustainable. It comes from natural igneous rock — the kind that forms after lava cools — and a steelmaking byproduct called slag. These substances are melted and spun into fibers to create the insulation. Over the past few years, stone wool has gained traction with eco-conscious architects and designers.