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Rockwool Insulation is a product of American Rockwool Manufacturing

Rock Wool Insulation, sometimes referred to as mineral wool, have been produced naturally for centuries. During volcanic eruptions, when a strong wind passes over a stream of molten lava, the lava is blown into fine silky threads that look like wool. From this natural inspiration sprung one of the most innovative and versatile insulation products on the market today. Today’s rock wool insulations are high-tech versions of their predecessors, produced from plentiful basalt and industrial slag. Their versatility allows them to be used in a wide variety of residential, commercial and industrial applications to provide sustainable thermal and acoustical comfort and, perhaps most uniquely, to serve as passive fire protection. Although rock wool are not as well known among North American consumers as other insulation products, these fiberized products have been used effectively in buildings around the world for more than a century and remain some of the most innovative and versatile insulations in use today.

Rock wool insulation is composed principally of fibers manufactured from a combination of
aluminosilicate rock (usually basalt), blast furnace slag and limestone or dolomite. Slag is a byproduct from steel production that would otherwise wind up in landfills. Binders may or may not be used, depending on the product. Typically, rock wool insulation is comprised of a minimum of 70- 75 percent natural rock. The remaining volume of raw material is blast furnace slag.