Well, according to a spokesman for the federal Environmental Protection Agency (EPA), if the area is not crumbling or flaking, the best thing to do is to leave it alone.
If you think that your floor tiles contain asbestos, Tom Kraeutler, the co-host of syndicated radio show,The Money Pit, says that your best bet is to lay another floor or carpet over it. Kraeutler goes on to say that a sealant is usually unnecessary.
Kraeutler's advice for a ceiling coated with popcorn paint (textured spray paint) is that it can be repainted, which should seal the material in place. If the ceiling must be scraped, the paint should be tested to see if it contains asbestos (not all popcorn ceilings do). If asbestos is found it should be removed by a certified remediation company.
When it comes to asbestos siding. it should be removed, because nailing new siding on top of it could crack the shingles and release fibers. Insulated heating pipes can be encapsulated by a professional with a special sealant, and loose-fill can be left in place if not disturbed.
Any time there is any question about whether a crumbling or flaking material contains asbestos, it should be tested. The problem is that you can't ascertain whether a material contains asbestos just by looking at it.
The easiest way to test is to wet a small section, so that the fibers don't become airborne, and break or cut off a piece about the size of a nickel. You don't need to wear gloves, asbestos is only dangerous when airborne. The sample can then be sent to a testing lab. The cost can be $100 or more but it is essential that you have the work done. You should use a federally accredited laboratory; the list is updated on a monthly basis.
If you do have contaminated material in your home or garden, it must be be removed by a licensed asbestos remediation company. However, there are different rules for different states, so you should check out your local directives. Most asbestos-removal jobs for a homeowner are in the region of $5,000 to $10,000.
New York Times