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Knob and tube wiring is an older type of electrical wiring that's no longer used and generally not considered safe. However, some homes still have it, or may have a knob and tube wiring system that was incorrectly modified or rigged to work with a modern electrical system. Knob and tube wiring may contain asbestos insulation, but the only way to know is to have the material professionally tested.

Vermiculite insulation that comes from a particular mine before 1990 is likely to contain asbestos. This is particularly true in the U.S. However, not all types of vermiculite insulation contain asbestos. Since you can't detect the presence of asbestos without special equipment, it's best to assume that the insulation contains the dangerous mineral and to either leave it alone or hire a professional to handle it.

Even a single, one-time exposure to asbestos can be harmful and pose health risks. According to the EPA, any contact can increase the risk of developing asbestos-related diseases and certain types of cancer, although the likelihood of severe health issues increases with repeated or prolonged exposure.

The severity of a single exposure depends on factors like the duration, intensity, and concentration of the asbestos fibers. While a small amount is less likely to cause significant damage, a high concentration can lead to serious long-term lung damage. Individual reactions vary, and asbestos-related illnesses may not appear for 10 to 40 years after inhalation.

Given these risks, always take precautions around any material suspected to contain asbestos. Personal protective equipment (PPE) may not be completely effective. If you suspect asbestos is in your home, hire a professional for testing and removal. If you are worried about a potential exposure, consult your doctor.

Whether or not to buy a home containing asbestos is ultimately a decision for the homebuyer, and there are several things to consider. When in good condition and contained, asbestos is unlikely to present a health risk—it’s when those tiny fibers are loose and airborne that they become a problem. Consider any renovations you plan on doing to the home that could disturb existing asbestos and the cost of removal. If an inspection finds asbestos in a home on the market, you could negotiate with the seller for a lower price, though this isn’t a sure thing.