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Mineral wool batts are denser than other types of rockwool insulation, making them better at soundproofing interior walls, floors and ceilings. Install batts between rooms or in the joist spaces between floors to reduce sound transmission
It’s much easier to do a top-notch insulation job if you use mineral wool instead of fiberglass. Because of its greater rigidity, mineral wool can be cut more exactly, allowing precise trimming around outlets and other obstructions. By contrast, fiberglass batts simply aren’t easy to install accurately. They’re floppy, hard to cut precisely, and prone to overstuffing.
Cost and availability
On a square-foot basis, mineral wool batts cost more than fiberglass batts. As an example, the R-15 mineral wool costs about 80¢ per sq. ft. vs. 60¢ for fiberglass. There are at least three brands of mineral wool batts for thermal wall insulation: Johns Manville TempControl, Roxul ComfortBatt and Thermafiber UltraBatt. Be aware, though, that you may have to special-order mineral wool batts.
Mineral wool withstands extreme heat better than other types of insulation. In a fire, the batts retain their shape and offer better protection against flame spread. And you builders may be interested to learn that when they’re combined with special fire-rated sheathing, mineral wool batts can be used to create a one-hour-fire-rated assembly without any extra labor.
Another cool property of mineral wool batts is that they don’t absorb water, staying intact even when wet. This means that if your wall or roof leaks, the batts will be as good as new after they dry out. Fiberglass or cellulose, on the other hand, droop, clump up or compress when they get wet. And sometimes, the only way to restore their insulating value is to tear off the wall covering and replace them. When it comes to water resistance, only foam insulation beats mineral wool.
The itch factor
Like fiberglass, mineral wool contact can make you itch or even cause a mild rash. Some installers say it’s a little worse than fiberglass; some say a little better. I can’t tell the difference. Regardless of which material you install, be sure to wear a dust mask, goggles, gloves and a longsleeve shirt.
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