First question: are you sure it's asbestos and not clay tile? I have seen situations where the two were confused by multiple observers, including experienced home inspectors and HVAC contractors:
Fig 1: Asbestos duct in floor slab from http://www.inspect-ny.com/sickhouse/asbestoslookF.htm
Fig 2 Clay tile duct in floor slab at one of my inspectons in a north Chicago suburb.
Fig 3 One method of clay tile identification is by photographing down a duct section through a floor register.
Home Inspections, Infrared (Thermal Imaging) Leak Identification and Inspection Services, Roof, Attic, Building, Basement and Foundation Moisture Intrusion and Water Leak Inspections, Troubled Building Consultations - Serving Chicago and Suburbs
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Last edited by Michael Thomas; 08-25-2009 at 03:34 PM.