Sequence abatement before the HVAC contractor
Asbestos removal comes first and the HVAC trade follows, with the work area cleaned and inspected in between. Duct insulation usually becomes friable once it is cut or torn, so a positive result means wet removal inside a negative-pressure enclosure or glove bags, with the waste sealed and labeled. The district's FAQ points out that regulated asbestos waste must be carried by an EPA-licensed hazardous waste transporter.
Two thresholds drive the paperwork. District notification starts at 100 linear feet or 100 square feet of regulated material, and duct runs measured in linear feet get there faster than people expect. Below Cal/OSHA's 100-square-foot registration line, the work still has to meet its worker-protection rules. Cost depends on how much duct is reachable, crawlspace height, and how much of the system is being replaced.
Register boots sit in ceilings and floors, so duct work can overlap with asbestos popcorn ceiling removal when sprayed texture surrounds the openings. For the other services and the Bay Area testing rules, visit the Dublin CA Asbestos Removal homepage.