Insulation: Roxul ComfortBatt

Fire-resistant thermal stone wool insulation for exterior walls, attics, crawlspaces, and basements.


ROXUL ComfortBatt is available in R15, R23 and R30 options, and provides improved levels of energy efficiency, for a comfortable indoor environment. It’s made of a combination of natural basalt rock and recycled slag, a mineral by-product of the steel-making process. The product features a flexible edge that is designed to compress as the batt is inserted into walls, attics, ceilings and floor frames. The spring-back aspect of this insulation expands the batt against the frame studs to give a complete fill and compensates for normal variations in stud centers caused by distortion or warping. The insulation can be cut with a serrated blade and trimmed for the best possible fit around electrical and plumbing for optimal R-value and maximum sound absorption. The product has a big environmental upside: it saves more than 128 times the energy it takes to produce it. Roxul is available at Lowe’s, Home Depot, and many lumberyards throughout the United States.

Check out the company’s install videos.