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Cotton batts were introduced in the late 20th Century, and taken off the market. They are now back on the market and are available in 3.5" R-13 or 5.5" R-19 thicknesses. Sheep's wool is used as an insulating material for joints in log homes, and is now available in batt form. Both products are borate treated for pest and fire resistance.
The general term "mineral wool" refers to fiberglass, rock wool (made from basalt, a volcanic rock, and from limestone) and slag wool (made from blast furnace slag). In addition to the use of rock and slag wool for insulation of pipes and many other industrial, appliance and transportation uses, it is used in batt and board form in commercial buildings for fire-resistance and acoustical absorption. Batts are made entirely or mostly of rock wool. Unlike fiberglass, batt widths and thicknesses vary among the different manufacturers.