Rockwool looks just like fiberglass batts and even feels like fiberglass. It closely edges out fiberglass in R-value and is more resistant to damage, moisture and mold. It is also less flammable. Rockwool is also available in blankets, the batts also come in different widths. Because Rockwool is recyclable, it is considered to be environmentally friendly. Rockwool is a comes from the making of steel called slag wool. It is something that would normally be thrown away.
Strong Resistance to Heat
No other fabric comes close to Rockwool in its ability to withstand heat. It will not melt below 2000 degrees. It is also well resistant to mold and moisture damage. It does not saturate water and does not expand or contract. It also stays intact more so than fiberglass. Mineral wool batts have the option of being faced or unfaced. People who have used fiberglass in the past can easily install Rockwool. Unfortunately Rockwool is not widely available.