Asbestos in homes built before 1990: test before you renovate

Asbestos is rarely a problem while it sits untouched in a wall or floor. It becomes a problem when a renovation cuts, sands or breaks it, releasing fibres that are linked to serious lung disease.

Where it can be

Health Canada's renovation guidance lists insulation, exterior siding, floor and ceiling tiles, cement and plaster as places asbestos may be found in homes built before 1990. Vermiculite attic insulation is a separate, well-known case.

Usually low risk when intact

Health Canada says there are usually no significant health risks when asbestos materials are in good condition, sealed behind walls or floorboards, or isolated in an attic.

Test before you start

Contact a professional to test suspect materials before planning renovations or demolition, rather than testing them yourself. Do this before you sign the renovation contract, so removal can be priced and scheduled.

If asbestos is found

Do not disturb it yourself. Hire a qualified asbestos removal specialist before the renovation begins.

Why it matters

Health Canada says breathing in fibres released during renovation and demolition can lead to lung cancer, asbestosis and mesothelioma.

Prevention Checklist

• Check the year the house was built.
• List the materials the renovation will cut, sand or remove.
• Have suspect materials tested by a professional before signing a contract.
• Leave intact asbestos materials alone.
• Use a qualified asbestos removal specialist if it is found.

References

1. Health Canada. Asbestos and your health, Web page, Risks; intact materials; professionals. Accessed 2026-11-01.
2. Health Canada. Planning a renovation? Asbestos - what you need to know, Web page, Where found; test before renovating. Accessed 2026-11-01.

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