Availability

Mineral wool insulation products also appear to be extremely pop­ular outside the United States. For example, a softer mineral wool batt product is now available from a Canadian manufacturer. In contrast to the stiff and brittle rock wool batts, this new product is highly compressible, which allows easier insertion between fram­ing members and a friction-fit installation. At the present time, the soft mineral wool batt insulation is more fragile than fiberglass insulation and is about 15 percent higher in cost.16