"In terms of thermal performance, there's not much to choose between rock wool and other types of mineral wool such as glass wool. According to insulationgo.co.uk, certain examples of the two types can have the same thermal conductivity, rated at 0.044 W/m·K. However, glass wool is assessed as providing a higher R-value (better resistance to heat flow), at 3.2 m²K/W compared to rock wool's 2.27 m²K/W. With that said, thermal insulation performance varies depending on the specific product (and its thickness)."
"Raw material is melted, then spun into fibres which are bound together into an insulation product such as a roll. We should clarify that 'Rockwool' is the brand name of one particular rock wool producer. This is not the only brand making rock wool insulation (originally known as 'stone wool'), but its name has become a byword for rock wool itself, much like other genericides such as 'hoover' for vacuum cleaning and 'google' for searching the internet."
Mineral wool insulation includes glass wool, slag wool and rock wool. Rock wool is produced from volcanic rock such as basalt; glass wool from recycled glass; slag wool from blast furnace slag. Most mineral wools are manufactured by melting raw materials and spinning them into fibres, then binding those fibres into rolls or other products. Rockwool is a brand name for one rock wool producer and has become a byword for stone wool. Rock wool tends to be denser and more robust. Thermal performance can be similar across mineral wools, but R-value and effectiveness depend on specific product and thickness.
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