Some old blown in Rockwool insulation. Also known a stone wool or mineral wool. Introduced in 1909, it is made from natural stone and steel slag. Still used today for its superior

Visual Identification of Rock Wool, Stone Wool, Mineral Wool, & Slag Wool Building Insulation What does mineral wool look like? What color is slag wool insulation?

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Visual Identification of Rock Wool, Stone Wool, Mineral Wool, & Slag Wool Building Insulation What does mineral wool look like? What color is slag wool insulation?

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Visual Identification of Rock Wool, Stone Wool, Mineral Wool, & Slag Wool Building Insulation What does mineral wool look like? What color is slag wool insulation?