Definition of rock wool in English:

rock wool

Syllabification: rock wool


  • Inorganic material made into matted fiber used especially for insulation or soundproofing.
    More example sentences
    • You can compensate for this stacking effect and achieve the desired total R-value by adding about one extra inch of insulation if the old insulation is fiber glass, or about ½ inch if the old insulation is rock wool or cellulose.
    • Pipes for kitchen stoves, wood stoves, and furnaces should only be insulated with fiberglass or rock wool because cellulose may smolder if flue temperatures become hot enough.
    • Pack gaps around an insulated chimney with unfaced rock wool or unfaced fiber glass insulation.

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Word of the day mage
Pronunciation: meɪdʒ
a magician or learned person