What Is Asbestos? Asbestos is a mineral fiber. It can be
positively identified only with a special type of microscope.
There are several types of asbestos fibers. In the past, asbestos
was added to a variety of products to strengthen them and to
provide heat insulation and fire resistance.
How Can Asbestos Affect My Health? From
studies of people who were exposed to asbestos in factories and
shipyards, we know that breathing high levels of asbestos fibers
can lead to an increased risk of:
lung cancer
mesothelioma, a cancer of the lining of the chest and the
abdominal cavity
asbestosis, in which the lungs become
scarred with fibrous tissue
The risk of lung cancer and mesothelioma
increases with the number of fibers inhaled. The risk of
lung cancer from inhaling asbestos fibers is also greater
if you smoke. People who get asbestosis have usually been
exposed to high levels of asbestos for a long time. The symptoms
of these diseases do not usually appear until about 20 to
30 years after the first exposure to asbestos.
Most people exposed to small amounts
of asbestos, as we all are in our daily lives, do not develop
these health problems. However, if disturbed, asbestos material
may release asbestos fibers, which can be inhaled into the
lungs. The fibers can remain there for a long time, increasing
the risk of disease. Asbestos material that would crumble
easily if handled, or that has been sawed, scraped, or sanded
into a powder, is more likely to create a health hazard.
Where Can I Find Asbestos And When Can It Be A Problem? Most products made today do not contain
asbestos. Those few products made which still contain asbestos
that could be inhaled are required to be labeled as such. However,
until the 1970s, many types of building products and insulation
materials used in homes contained asbestos. Common products that might have contained
asbestos in the past, and conditions which may release fibers, include:
Steam pipes, boilers and furnace ducts insulated with an
asbestos blanket or asbestos paper tape. These materials
may release asbestos fibers if damaged, repaired, or removed
improperly.
Resilient floor tiles (vinyl asbestos, asphalt, and rubber),
the backing on vinyl sheet flooring, and adhesives used for
installing floor tile. Sanding tiles can release fibers.
So may scraping or sanding the backing of sheet flooring
during removal.
Cement sheet, millboard, and paper used as insulation around
furnaces and wood burning stoves. Repairing or removing appliances
may release asbestos fibers. So may cutting, tearing, sanding,
drilling, or sawing insulation.
Door gaskets in furnaces, wood stoves, and coal stoves.
Worn seals can release asbestos fibers during use.
Soundproofing or decorative material sprayed on walls and
ceilings. Loose, crumbly, or water-damaged material may release
fibers. So will sanding, drilling, or scraping the material.
Patching and joint compounds for walls and ceilings, and
textured paints. Sanding, scraping, or drilling these surfaces
may release asbestos.
Asbestos cement roofing, shingles,
and siding. These products are not likely to release asbestos
fibers unless sawed, drilled, or cut.
Artificial ashes and embers sold for use in gas-fired fireplaces.
Also, other older household products such as fireproof gloves,
stove-top pads, ironing board covers, and certain hairdryers.
Automobile brake pads and linings,
clutch facing, and gaskets.
Where Asbestos Hazards May Be Found
In The Home
Some roofing and siding shingles are made of asbestos cement
Houses built between 1930 and 1950 may have asbestos as
insulation.
Asbestos may be present in textured paint and in patching
compounds used on wall and ceiling joints. Their use was
banned in 1977.
Artificial ashes and embers sold for use in gas-fired fireplaces
may contain asbestos.
Older products such as stove-top pads may have some asbestos
compounds.
Walls and floors around wood burning stoves may be protected
with asbestos paper, millboard, or cement sheets.
Asbestos is found in some vinyl floor tiles and the backing
on vinyl sheet flooring and adhesives.
Hot water and steam pipes in older houses may be coated
with an asbestos material or covered with an asbestos blanket
or tape.
Oil and coal furnaces and door gaskets may have asbestos
insulation.
What Should Be Done About Asbestos
In The Home?
If you think asbestos may be in your home,
don't panic, usually the best thing is to leave asbestos material
that is in good condition alone. Generally, material in good
condition will not release asbestos fibers. There is no danger
unless fibers are released and inhaled into the lungs. Check
material regularly if you suspect it may contain asbestos. Don't
touch it, but look for signs of wear or damage such as tears,
abrasions, or water damage. Damaged material may release asbestos
fibers. This is particularly true if you often disturb it by
hitting, rubbing, or handling it, or if it is exposed to extreme
vibration or air flow. Sometimes, the best way to deal with slightly
damaged material is to limit access to the area and not touch
or disturb it. Discard damaged or worn asbestos gloves, stove-top
pads, or ironing board covers. Check with local health, environmental,
or other appropriate officials to find out proper handling and
disposal procedures. If asbestos material is more than slightly
damaged, or if you are going to make changes in your home that
might disturb it, repair or removal by a professional is needed.
Before you have your house remodeled, find out whether asbestos
materials are present.
How To Identify Materials That Contain
Asbestos
You can't tell whether
a material contains asbestos simply by looking at it, unless
it is labeled. If in doubt, treat the material as if it contains
asbestos or have it sampled and analyzed by a qualified professional.
A professional should take samples for analysis, since a professional
knows what to look for, and because there may be an increased
health risk if fibers are released. In fact, if done incorrectly,
sampling can be more hazardous than leaving the material alone.
Taking samples yourself is not recommended. If you nevertheless
choose to take the samples yourself, take care not to release
asbestos fibers into the air or onto yourself. Material that
is in good condition and will not be disturbed (by remodeling,
for example) should be left alone. Only material that is damaged
or will be disturbed should be sampled. Anyone who samples
asbestos-containing materials should have as much information
as possible on the handling of asbestos before sampling, and
at a minimum, should observe the following procedures:
Make sure no one else is in the room when sampling is done.
Wear disposable gloves or wash hands after sampling.
Shut down any heating or cooling systems to minimize the
spread of any released fibers.
Do not disturb the material any more than is needed to
take a small sample.
Place a plastic sheet on the floor below the area to be
sampled.
Wet the material using a fine mist of water containing
a few drops of detergent before taking the sample. The water/detergent
mist will reduce the release of asbestos fibers.
Carefully cut a piece from the entire depth of the material
using, for example, a small knife, corer, or other sharp
object. Place the small piece into a clean container (for
example, a 35 mm film canister, small glass or plastic vial,
or high quality re-sealable plastic bag).
Tightly seal the container after
the sample is in it.
Carefully dispose of the plastic sheet. Use a damp paper
towel to clean up any material on the outside of the container
or around the area sampled. Dispose of asbestos materials
according to state and local procedures.
Label the container with an identification number and clearly
state when and where the sample was taken.
Patch the sampled area with the smallest possible piece
of duct tape to prevent fiber release.
Send the sample to an asbestos analysis
laboratory accredited by the National Voluntary Laboratory
Accreditation Program (NVLAP) at the National Institute
of Standards and Technology (NIST). Your state or local
health department may also be able to help.
How To Manage An Asbestos Problem
If the asbestos material is in good shape
and will not be disturbed, do nothing! If it is a problem, there
are two types of corrections: repair and removal. Repair usually
involves either sealing or covering asbestos material. Sealing
(encapsulation) involves treating the material with a sealant
that either binds the asbestos fibers together or coats the material
so fibers are not released. Pipe, furnace, and boiler insulation
can sometimes be repaired this way. This should be done only
by a professional trained to handle asbestos safely. Covering
(enclosure) involves placing something over or around the material
that contains asbestos to prevent release of fibers. Exposed
insulated piping may be covered with a protective wrap or jacket.
With any type of repair the asbestos remains in place. Repair
is usually cheaper than removal, but it may make later removal
of asbestos, if necessary, more difficult and costly. Repairs
can either be major or minor. Major repairs must be done only
by a professional trained in methods for safely handling asbestos.
Minor repairs should also be done by professionals since there
is always a risk of exposure to fibers when asbestos is disturbed.
Repairs
Doing minor repairs yourself is not recommended
since improper handling of asbestos materials can create a hazard
where none existed. If you nevertheless choose to do minor repairs,
you should have as much information as possible on the handling
of asbestos before doing anything. Contact your state or local
health department or regional EPA office for information about
asbestos training programs in your area. Your local school district
may also have information about asbestos professionals and training
programs for school buildings. Even if you have completed a training
program, do not try anything more than minor repairs. Before
undertaking minor repairs, carefully examine the area around
the damage to make sure it is stable. As a general matter, any
damaged area which is bigger than the size of your hand is not
a minor repair.
Before undertaking
minor repairs, be sure to follow all the precautions described
earlier for sampling asbestos material. Always wet the asbestos
material using a fine mist of water containing a few drops
of detergent. Commercial products designed to fill holes and
seal damaged areas are available. Small areas of material such
as pipe insulation can be covered by wrapping a special fabric,
such as re-wet able glass cloth, around it. These products
are available from stores (listed in the telephone directory
under Safety Equipment and Clothing")
which specialize in asbestos materials and safety items.
Removal is usually the most expensive method
and, unless required by state or local regulations, should be
the last option considered in most situations. This is because
removal poses the greatest risk of fiber release. However, removal
may be required when remodeling or making major changes to your
home that will disturb asbestos material. Also, removal may be
called for if asbestos material is damaged extensively and cannot
be otherwise repaired. Removal is complex and must be done only
by a contractor with special training. Improper removal may actually
increase the health risks to you and your family.
Asbestos Professionals: Who Are They
And What Can They Do?
Asbestos professionals
are trained in handling asbestos material. The type of professional
will depend on the type of product and what needs to be done
to correct the problem. You may hire a general asbestos contractor
or, in some cases, a professional trained to handle specific
products containing asbestos.
Asbestos professionals
can conduct home inspections, take samples of suspected material,
assess its condition, and advise about what corrections are
needed and who is qualified to make these corrections. Once
again, material in good condition need not be sampled unless
it is likely to be disturbed. Professional correction or abatement
contractors repair or remove asbestos materials.
Some firms offer combinations
of testing, assessment, and correction. A professional hired
to assess the need for corrective action should not be connected
with an asbestos-correction firm. It is better to use two different
firms so there is no conflict of interest. Services vary from
one area to another around the country.
The federal government
has training courses for asbestos professionals around the
country. Some state and local governments also have or require
training or certification courses. Ask asbestos professionals
to document their completion of federal or state-approved training.
Each person performing work in your home should provide proof
of training and licensing in asbestos work, such as completion
of EPA-approved training. State and local health departments
or EPA regional offices may have listings of licensed professionals
in your area.
If you have a problem
that requires the services of asbestos professionals, check
their credentials carefully. Hire professionals who are trained,
experienced, reputable, and accredited - especially if accreditation
is required by state or local laws. Before hiring a professional,
ask for references from previous clients. Find out if they
were satisfied. Ask whether the professional has handled similar
situations. Get cost estimates from several professionals,
as the charges for these services can vary.
Though private homes
are usually not covered by the asbestos regulations that apply
to schools and public buildings, professionals should still
use procedures described during federal or state-approved training.
Homeowners should be alert to the chance of misleading claims
by asbestos consultants and contractors. There have been reports
of firms incorrectly claiming that asbestos materials in homes
must be replaced. In other cases, firms have encouraged unnecessary
removals or performed them improperly. Unnecessary removals
are a waste of money. Improper removals may actually increase
the health risks to you and your family. To guard against this,
know what services are available and what procedures and precautions
are needed to do the job properly.
In addition to general
asbestos contractors, you may select a roofing, flooring, or
plumbing contractor trained to handle asbestos when it is necessary
to remove and replace roofing, flooring, siding, or asbestos-cement
pipe that is part of a water system. Normally, roofing and
flooring contractors are exempt from state and local licensing
requirements because they do not perform any other asbestos-correction
work. Call 1-800-USA-ROOF for names of qualified roofing contractors
in your area. For information
on asbestos in floors, read "Recommended Work Procedures for
Resilient Floor Covers." You can write for a copy from the Resilient
Floor Covering Institute, 966 Hungerford Drive, Suite 12-B, Rockville,
MD 20850. Enclose a stamped, business-size, self-addressed envelope.
Asbestos-containing
automobile brake pads and linings, clutch facings, and gaskets
should be repaired and replaced only by a professional using
special protective equipment. Many of these products are now
available without asbestos. For more information, read "Guidance for Preventing Asbestos Disease
Among Auto Mechanics," available from regional EPA offices.
If You Hire A Professional Asbestos
Inspector
Make sure that the inspection will include
a complete visual examination and the careful collection and
lab analysis of samples. If asbestos is present, the inspector
should provide a written evaluation describing its location and
extent of damage, and give recommendations for correction or
prevention.
Make sure an inspecting firm makes frequent
site visits if it is hired to assure that a contractor follows
proper procedures and requirements. The inspector may recommend
and perform checks after the correction to assure the area has
been properly cleaned.
If You Hire A Corrective-Action Contractor
Check with your local air pollution control board, the
local agency responsible for worker safety, and the Better
Business Bureau. Ask if the firm has had any safety violations.
Find out if there are legal actions filed against it.
Insist that the contractor use the proper equipment to
do the job. The workers must wear approved respirators, gloves,
and other protective clothing.
Before work begins, get a written contract specifying the
work plan, cleanup, and the applicable federal, state, and
local regulations which the contractor must follow (such
as notification requirements and asbestos disposal procedures).
Contact your state and local health departments, EPA's regional
office, and the Occupational Safety and Health Administration's
regional office to find out what the regulations are. Be
sure the contractor follows local asbestos removal and disposal
laws. At the end of the job, get written assurance from the
contractor that all procedures have been followed.
Assure that the contractor avoids spreading or tracking
asbestos dust into other areas of your home. They should
seal the work area from the rest of the house using plastic
sheeting and duct tape, and also turn off the heating and
air conditioning system. For some repairs, such as pipe insulation
removal, plastic glove bags may be adequate. They must be
sealed with tape and properly disposed of when the job is
complete.
Make sure the work site is clearly marked as a hazard area.
Do not allow household members and pets into the area until
work is completed.
Insist that the contractor apply a wetting agent to the
asbestos material with a hand sprayer that creates a fine
mist before removal. Wet fibers do not float in the air as
easily as dry fibers and will be easier to clean up.
Make sure the contractor does not break removed material
into small pieces. This could release asbestos fibers into
the air. Pipe insulation was usually installed in preformed
blocks and should be removed in complete pieces.
Upon completion, assure that the
contractor cleans the area well with wet mops, wet rags,
sponges, or HEPA (high efficiency particulate air) vacuum
cleaners. A regular vacuum cleaner must never be used.
Wetting helps reduce the chance of spreading asbestos fibers
in the air. All asbestos materials and disposable equipment
and clothing used in the job must be placed in sealed,
leakproof, and labeled plastic bags. The work site should
be visually free of dust and debris. Air monitoring (to
make sure there is no increase of asbestos fibers in the
air) may be necessary to assure that the contractor's job
is done properly. This should be done by someone not connected
with the contractor.
Caution!
Do not dust, sweep, or vacuum
debris that may contain asbestos. These steps will disturb tiny
asbestos fibers and may release them into the air. Remove dust
by wet mopping or with a special HEPA vacuum cleaner used by
trained asbestos contractors.