What to Do If You Remodel and Find Asbestos : Health: Physician offers ideas on what it was used for, how to find it and how to deal with it.

Phillips is associate medical director of the Barlow Occupational Health Center and a clinical instructor at the USC School of Medicine.

Asbestos in the home is often a major concern to the homeowner who is considering remodeling or repair work. Some basic knowledge concerning where asbestos is likely to be found, the health effects of asbestos, how exposure occurs and methods to prevent it, help make this a less intimidating experience.

Asbestos is a group of fibrous minerals that occur naturally in underground rock. It has been used extensively because of its fire-resistant properties. It was used in many common household items before its adverse health effects were known.

It is found in such materials as vinyl floor tiles, vinyl sheet flooring and in the mastic or glue used to lay the flooring.

It is also found in patching compounds used on wall and ceiling joints, but was banned from this use in 1977. Some paint sold before 1978 contained asbestos to give it a textured look.

Spray-on acoustical ceilings prior to 1978 were also likely to contain asbestos to keep the material free-flowing through the sprayer. Asbestos was used in cement sheets, millboard and paper around wood-burning stoves to prevent nearby walls and floors from being damaged by heat or fire.

It was used as insulation material in older forced air and natural gas heating systems, around ducts and hot water pipes. Drywall, transit pipe and insulation found between walls are also suspect.

Roofing and siding shingles, and roofing felt were also manufactured using asbestos-containing materials. Older small appliances often contained small amounts of asbestos as protection from heating elements. In 1979, hand-held hair-dryers were recalled because of the asbestos fibers that were released during use.

Trying to determine what building materials contain asbestos can be difficult. Generally, asbestos-containing materials were not used in homes built after 1979.

However, many contractors may have had older materials on hand, purchased before the ban. Many times these were used until gone.

To determine if a material in a home contains asbestos, labels stating the contents of the product are sometimes helpful. Manufacturers may also be able to determine the components of a product based on its model number or age. Many times, however, no such information is available.

A good rule of thumb is to assume that any of these types of materials manufactured prior to 1978 has the potential for containing asbestos.

In some cases, having the suspect material analyzed by a professional to determine its asbestos content may be warranted. This may be desirable for large repairs or major renovations. Many environmental consulting firms are able to provide this service for a fee.

Asbestos is a health concern because of its potential to cause lung disease and cancer. Breathing in the asbestos fibers, some too small to see, can be a health hazard. Smokers who are heavily exposed to asbestos are 50 to 90 times more likely to develop lung cancer compared to nonsmoking, unexposed individuals.

The risk of contracting asbestos-related diseases increases in relation to the amount of one's exposure to asbestos. Although many asbestos-exposed workers such as insulation workers, shingle makers and shipyard workers have some form of asbestos-related disease, these are occupations that they were exposed eight to 10 hours a day to visible asbestos dust for many years, Smaller exposures have a smaller risk. Most people exposed to small amounts of asbestos do not develop any health problems.

Asbestos becomes a hazard when the fibers become airborne and can be inhaled. Any activity that stirs up asbestos fibers into the air creates a hazard. Once airborne, fibers can remain in the air for hours.

Asbestos is also a hazard if swallowed, possibly causing cancer of the stomach and colon. Asbestos dust may settle on food or items that can be touched and subsequently swallowed.

When asbestos-containing home materials such as vinyl tiles and acoustical sprayed-on ceilings are in good condition the potential for adverse health effects is minimal.

However, soft, easily crumbled materials in poor repair, such as crumbling ceilings or torn insulation, can be a potential hazard. Normal wind currents can blow across a damaged surface and release asbestos fibers into the air.

Activities such as sanding or cutting tiles, scraping floors or cutting into acoustical ceilings can release asbestos fibers into the air.

Once it has been determined that asbestos may be in a home building material, it is best to leave it alone. Materials in good condition generally are not a significant hazard. The best method for preventing exposure to vinyl tiles and flooring is to cover it with another type of flooring. Tearing out or ripping up asbestos flooring can create a hazard that previously did not exist.

Special precautions should be taken during renovations or repair of asbestos-containing materials. Total removal of all of the material containing asbestos may be done. This must be done by licensed abatement or removal firms. These companies follow strict guidelines for removal. This is usually safe but can be very expensive.

If work is needed on areas where total removal is not feasible, it is best to seek help from a contractor who is trained and experienced in working with asbestos. These contractors are licensed by the state. Many home repair contractors are not experienced in the proper procedures for handling asbestos.

Contractors handling asbestos materials must follow strict procedures to minimize exposure. Proper methods used by asbestos workers prevent fibers from becoming airborne where they can be inhaled. Sealing off the work area from the rest of the home or job site with plastic sheeting and duct tape is done to prevent asbestos escaping into the other rooms.

A respirator approved for asbestos work must be used; a disposable paper or dust mask will not protect one from inhaling asbestos fibers. Gloves, hats and coveralls should be worn and are preferably disposable. Health effects have been reported in the spouses of asbestos workers, felt to be due to the shaking of clothing containing asbestos fibers. It is best to dispose of clothes that may be contaminated with asbestos.

Workers handling asbestos-containing materials may keep them damp with a fine mist from a hand sprayer to keep airborne fibers at a lower concentration. Water plus a mild detergent is often used. Fibers are kept damp but not dripping wet.

Protective coverings on pipes and ducts can be covered by enclosing with duct tape, especially if torn. Many commercial companies have products made of special materials specifically for enclosure of asbestos.

Debris must be placed in properly labeled plastic trash bags and disposed of in landfills that will accept asbestos-containing materials. The work area is kept damp and is cleaned regularly with wet rags and mops to reduce the chance of fibers becoming airborne. Rags and mops should also be disposed of in trash bags and sent to proper landfills.

Areas contaminated with asbestos dust should never be vacuumed. Fibers easily pass through household vacuum filters and become dispersed into the air. Vacuums designed specifically for asbestos, with special filters, may be used by trained individuals.

It is no wonder that just the mention of asbestos can create a great deal of anxiety in the homeowner who is contemplating remodeling. However, following the guidelines recommended above should help ensure a safe and proper home renovation.

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