Roxul Inc. is part of Rockwool International, the world's largest producer of mineral wool insulation with 23 facilities in 14 countries. We have operated our Harrop Drive Head Office and manufacturing facility in Milton, Ontario since 1988.Roxul's western facility is located in Grand Forks, British Columbia and has been in operation since November 1999. Our products are produced from a combination of natural basalt rock and recycled slag. These simple ingredients, combined with Roxul's world-class technology, produce a mineral wool insulation product of the highest quality that is better for the environment.