When these asbestos insulation boards or blocks are sawn apart or manipulated in any other way, asbestos is released into the air. Pipes in basements, furnace rooms, and utility rooms may be ...

contain no asbestos, whereas others, such as magnesia or calcium silicate insulation block and insulation cements, may contain 10 to 15 per cent asbestos. 9,10 Exposures are therefore to a number ...