When Was Asbestos Used in Ontario Homes?

Health Canada states that before 1990 asbestos was mainly used in buildings and homes for insulation, noise reduction, and fireproofing. (opens in a new tab) Building age is a screening clue, not proof that asbestos is present; only laboratory analysis can confirm a specific material. Understanding where asbestos may have been used and what to consider before renovation can help homeowners make informed next steps.

When Was Asbestos Used in Ontario?

Ontario guidance states that asbestos was widely used in sprayed-on material and pipe and boiler insulation until 1973, while many other asbestos-containing materials continued to be used until the mid-1980s. (opens in a new tab) Some products may have been used later, so a construction date alone cannot establish whether a particular material contains asbestos.

What Is Asbestos and Why Is It Dangerous?

Asbestos is a naturally occurring fibrous silicate mineral that was mined extensively in Quebec and used in hundreds of building products. When asbestos-containing materials are disturbed — cut, drilled, sanded, or demolished — microscopic fibres become airborne. These fibres can be inhaled and become permanently lodged in lung tissue.

Long-term exposure to asbestos fibres is associated with serious respiratory diseases including mesothelioma (a rare cancer of the lung lining), asbestosis (progressive lung scarring), and lung cancer. These diseases typically have a latency period of 20–40 years between exposure and diagnosis, which is why asbestos-related illness continues to appear in workers and homeowners exposed decades ago.

Intact, undisturbed asbestos-containing materials that are in good condition generally do not pose an immediate health risk. The risk arises when materials are damaged, deteriorating, or disturbed during renovation or demolition.

Where Asbestos Was Used in Ontario Homes

Asbestos was used in a wide range of building products. The most common locations in GTA homes built before 1990 include:

• Vermiculite attic insulation — Zonolite brand vermiculite, widely used in Ontario from the 1950s–1980s, was contaminated with asbestos from the Libby, Montana mine
• Vinyl floor tiles and sheet flooring — 9"×9" and 12"×12" floor tiles from the 1950s–1970s frequently contain asbestos, as does the black mastic adhesive beneath them
• Drywall joint compound (mud) — Pre-1980 drywall compound often contained asbestos for crack resistance
• Textured ceiling coatings (popcorn ceilings) — Spray-applied acoustic ceiling texture applied before 1980 frequently contains asbestos
• Pipe and duct insulation — Corrugated cardboard-like wrap on heating pipes and ductwork in older homes
• Boiler and furnace insulation — Blanket insulation on older oil and gas boilers
• Exterior siding (transite) — Fibre-cement siding containing asbestos, common on homes built 1940s–1970s
• Roofing shingles and felt — Some asphalt shingles and roofing felt from pre-1980 contain asbestos
• Electrical panel insulation — Wiring insulation in older panels may contain asbestos

You cannot identify asbestos by sight. Many asbestos-containing materials look identical to non-asbestos versions. The only way to confirm the presence of asbestos is laboratory analysis of a sample collected by a qualified professional.

The Do-Not-Disturb Rule

The most important principle for homeowners is simple: if you suspect a material may contain asbestos, do not disturb it until it has been tested. This means:

• Do not drill, cut, sand, scrape, or break suspected ACMs
• Do not attempt to remove old floor tiles, ceiling texture, or pipe insulation yourself
• Do not sweep or vacuum asbestos debris — standard vacuums spread fibres rather than capturing them
• Do not use power tools on suspected ACMs

If you have already disturbed a suspected ACM, leave the area, close doors to prevent spread, and contact a licensed asbestos abatement contractor for assessment.

How Asbestos Is Tested

Asbestos testing involves collecting a small sample of the suspected material and submitting it to an accredited laboratory for polarized light microscopy (PLM) analysis. In Ontario, sampling should be performed by a qualified professional to ensure proper collection technique and to minimize fibre release during sampling.

A typical asbestos assessment for a pre-1990 GTA home includes:

• Visual inspection and identification of all suspected ACMs
• Collection of representative samples from each material type
• Laboratory analysis (typically 3–5 business days, or 24-hour rush available)
• Written report identifying ACMs, their condition, and recommended management or abatement

Ontario Legal Requirements

Ontario Regulation 278/05 (opens in a new tab) (Designated Substance — Asbestos on Construction Projects and in Buildings and Repair Operations) under the Occupational Health and Safety Act establishes strict requirements for asbestos work in Ontario:

• Type 1 work (minor disturbance, low risk): Can be performed by trained workers with basic precautions
• Type 2 work (moderate disturbance): Requires a two-person crew with proper containment and PPE
• Type 3 work (major disturbance, friable ACMs): Requires a Ministry of Labour licensed contractor, full containment, negative air pressure, and air monitoring

Most renovation-related asbestos removal in GTA homes — including floor tile removal, pipe insulation removal, and drywall compound disturbance — qualifies as Type 2 or Type 3 work. Homeowners who perform this work themselves without proper training and equipment are violating Ontario law and exposing themselves and their families to significant health risk.

The Abatement Process

A licensed asbestos abatement contractor follows a structured process to safely remove ACMs:

• Containment setup: The work area is sealed with poly sheeting and negative air pressure is established using HEPA-filtered air scrubbers
• Worker protection: Technicians wear Tyvek suits, gloves, and P100 half-face or full-face respirators
• Wet removal: ACMs are wetted to suppress fibre release during removal
• Waste disposal: All ACM waste is double-bagged in labelled poly bags and disposed of at an approved facility
• Clearance: After removal and decontamination, the area is visually inspected and air monitoring may be performed to confirm fibre levels are below the Ontario clearance standard

Renovation Safety Tips for GTA Homeowners

• Test before you renovate. For any pre-1990 home, commission an asbestos assessment before beginning any demolition, flooring removal, or ceiling work.
• Include asbestos testing in your renovation budget. A professional assessment typically costs $300–$800 and can prevent costly remediation and health consequences.
• Disclose to contractors. Inform your renovation contractor if asbestos-containing materials have been identified. They are legally required to follow safe work procedures.
• Verify contractor licensing. For Type 3 work, confirm that the contractor holds a current Ministry of Labour asbestos abatement licence.
• Get clearance documentation. After abatement, obtain written clearance documentation for your records — this is valuable for future real estate transactions.

Frequently Asked Questions

When was asbestos used in Ontario homes?

Before 1990, asbestos was mainly used in homes and buildings for insulation, noise reduction, and fireproofing. Ontario guidance notes widespread use in sprayed-on material and pipe and boiler insulation until 1973, with many other asbestos-containing materials used until the mid-1980s. Home age alone cannot confirm asbestos; laboratory analysis is needed for a specific material.

How much does asbestos abatement cost in Toronto?

Asbestos abatement costs in the GTA vary significantly based on the type, quantity, and location of ACMs. A typical floor tile removal project may range from $800–$3,000. Vermiculite attic insulation removal can range from $3,000–$15,000+ depending on attic size and access. Final pricing depends on inspection findings, material category, affected area, containment requirements, and disposal costs.

Does home insurance cover asbestos abatement?

Standard home insurance policies typically do not cover asbestos abatement as a maintenance or renovation cost. Coverage may apply if asbestos is disturbed as a result of an insured event (fire, flood, structural damage). Consult your insurer for your specific policy terms.

Can I sell my home if it contains asbestos?

Yes — the presence of asbestos does not prevent a home sale in Ontario. However, sellers have a duty to disclose known material defects. If asbestos has been identified in your home, disclosure to potential buyers is advisable. Many buyers will request abatement as a condition of purchase.

How do I find a licensed asbestos contractor in Ontario?

The Ontario Ministry of Labour maintains a registry of licensed asbestos abatement contractors. Wright Restorations Canada holds a current Ministry of Labour Type 3 asbestos abatement licence and serves the entire GTA.