New Insulation option in Flex: Mineral Wool Insulation—is a high-performance insulation material made by melting basalt rock (and often recycled slag or basalt) and spinning it into dense, wool-like fibers. It’s commonly manufactured by companies like Rockwool.

Here’s how the terms are typically used:

• Stone wool – Emphasizes that the insulation is made from natural stone (usually basalt).

• Mineral wool – The broader category that includes stone wool and slag wool.

• Rockwool – A popular brand name that has become a generic shorthand in everyday conversation, similar to how people say “Kleenex” for tissues.

So in practice, these are often used interchangeably:

• Stone wool = mineral wool (stone-based)

• Rockwool = a brand of stone wool