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Identify the Asbestos Contaminant Materials in Older Homes, Hidden Dangers

Know What to Look for to Uncover the Asbestos Risks in Your Home

Asbestos-containing materials (ACMs) were widely used in residential construction until the 1980s due to their durability, heat resistance, and insulation properties. However, with the discovery of the health risks associated with asbestos exposure, the use of asbestos in building materials has been banned in many countries. Despite these bans, millions of homes still contain ACMs, posing a hidden danger to occupants. This article will explore common ACMs found in older homes and guide in identifying and addressing these hazards.


Common Asbestos-Containing Materials in Older Homes

Asbestos was used in a wide variety of building materials. Here are some common ACMs found in older homes:

  • Insulation: Asbestos was commonly used in insulation products, such as pipe insulation, boiler insulation, and attic insulation. Vermiculite, a naturally occurring mineral, was often used as a loose-fill insulation material in attics and walls. While not all vermiculite contains asbestos, a significant portion of the vermiculite insulation installed in homes in the United States came from a mine in Libby, Montana, contaminated with asbestos. When inspecting insulation, look for white, grey, or brown fibrous materials that may indicate the presence of asbestos.
  • Flooring materials: Asbestos was used in various flooring materials, including vinyl tiles, sheet vinyl, and linoleum. It was also used in the backing or adhesive of these materials. Look for older flooring materials, especially 9-inch by 9-inch tiles or sheet vinyl with a paper-like backing, which are more likely to contain asbestos.
  • Roofing and siding materials: Asbestos was used in roofing shingles, felt, and siding materials due to its fire resistance and durability. Asbestos-containing roofing materials may appear grey or white fibrous, while asbestos siding may resemble cement boards and have a wavy or flat profile.
  • Textured coatings and plaster: Asbestos was used in textured coatings, such as “popcorn” or “cottage cheese” ceilings, and in some plasters. These coatings often have a rough, bumpy appearance and were popular from the 1950s to the 1980s.


Other materials: Asbestos can also be found in a wide range of other materials in older homes, such as:

  1. Heating and cooling system components: Asbestos was used to insulant heating ducts, furnace gaskets, and air conditioning system components.
  2. Window caulking and the glazing: Asbestos-containing materials were used in some caulking and glazing compounds for windows and doors.
  3. Cement sheet products: Asbestos was used in cement sheets, often used for walls, ceilings, and underlayments.
  4. Electrical components: Asbestos was used in some electrical components, such as switchboards and wiring insulation, due to its heat resistance and insulating properties.
  5. Fireproofing materials: Asbestos was used in fireproofing materials, such as fire blankets, fire curtains, and fire doors, due to its excellent resistance to heat and flame.


Identifying Asbestos-Containing Materials 

Identifying ACMs in older homes can be challenging, as asbestos fibres are often mixed with other materials and are not visible to the naked eye. Here are some tips to help identify potential ACMs:

  • Age of the home: Homes built before the 1980s are more likely to contain asbestos materials. Remember that asbestos in construction materials was phased out over time, so homes built in the 1970s may still contain some ACMs.
  • Visual inspection: Look for materials that resemble known ACMs or have a fibrous appearance. While a visual inspection cannot definitively confirm the presence of asbestos, it can help identify areas that may warrant further investigation.
  • Professional testing: The only way to confirm the presence of asbestos in a material is through laboratory testing. If you suspect your home contains ACMs, hire a certified asbestos inspector to collect samples and have them tested by a qualified laboratory.


What to Do If You Find Asbestos-Containing Materials 

If you discover ACMs in your home, the appropriate course of action depends on the condition and location of the materials. In general, follow these guidelines:

  • Leave undisturbed materials in good condition alone: If the ACMs are in good condition and unlikely to be disturbed, it is often best to leave them alone and monitor their condition over time.
  • Repair or encapsulate damaged materials: If the ACMs are slightly damaged or at risk of disturbance, consider repairing or encapsulating the materials to prevent the release of asbestos fibres.
  • Consider asbestos abatement for severely damaged materials or major renovations: If the ACMs are severely damaged or if you are planning renovations that will disturb the materials, consult with an asbestos abatement professional to discuss removal or containment options.
  • Never attempt DIY asbestos removal: Asbestos removal should only be performed by licensed professionals with the proper training, equipment, and disposal methods. Attempting to remove asbestos can increase exposure risk and contaminate your home.


Legal Obligations and Disclosures

Property owners should know their legal obligations regarding asbestos management and disclosure. While regulations vary by jurisdiction, homeowners may be required to disclose the presence of known ACMs when selling a property or renting it out. Consult with a local attorney or real estate professional to understand your legal obligations.

Identifying and managing asbestos-containing materials in older homes is critical for protecting the health and safety of occupants. By knowing what to look for and how to address potential hazards, homeowners can take the necessary steps to mitigate the risks associated with asbestos exposure. Always consult with certified professionals when dealing with asbestos and follow all applicable regulations to ensure your family’s safety and preserve your property’s value.

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