Asbestos, the well-known fireproof and acidproof fibrous mineral, is the basis of several substances useful to the builder.1
The raw material comes from Italy, Canada, California, Australia, etc. The two first are the best in the order given. Italian asbestos is grey or brown in colour, Canadian white, Asbestos Paints (see p. 428).
It is supplied in rolls about 381/2 inches wide, containing 200 square feet, and weighs about 85 lbs. per square.
Asbestos Sheathing is fireproof, and used for lining wooden partitions, ceilings, etc. It is made in rolls of from 60 to 100 lbs. 42 inches wide, weighing about 6 lbs. per square; also "double thick," weighing about 10 lbs. per square.