if you install new siding on top of old asbestos siding, you may keep the fibers trapped, but it would not necessarily be considered encapsulation. To do so properly requires a professional, who uses a certain type of sealant that needs to be spread over the asbestos in a number of layers in order to trap all the fibers. Although you may be able to buy this sealant yourself, it is highly advised that, once you find asbestos, you call a pro immediately. 

It is best to wear a respirator during the sanding, painting, and sealing process. It can filter particles, vapors, and fumes that can be toxic to breathe. So it’s better to be safe and protect your lungs during this project.

If you suspect exposure to asbestos, prioritize seeking medical advice by informing your healthcare provider about the potential exposure with clear details about the circumstances that led to the exposure. Regular health check-ups and screenings if you work in high-risk industries or live in a home with asbestos are essential for early detection of any asbestos-related conditions. You should also consider consulting occupational health experts or legal professionals for guidance on potential next steps and preventive measures.

In the 1980s, the use of asbestos in house siding materials underwent a significant decline, ultimately being phased out by the mid-1980s to early 1990s. This change was largely due to a growing awareness of the severe health risks associated with asbestos exposure, particularly its link to lung diseases and cancers. With increased public concern and regulatory agency involvement, building codes and regulations were updated to restrict the use of asbestos in construction materials.