Vermiculite Insulation in Older Ontario Homes: What Homeowners Need to Know
Vermiculite insulation is often found in attics of older homes throughout Ontario. While vermiculite itself is not always hazardous, some products were contaminated with asbestos during mining and processing.
What Is Vermiculite Insulation?
Vermiculite is a loose, pebble-like insulation that is typically grey, brown, or gold in colour. It was commonly installed for its fire-resistant and insulating properties.
Why Vermiculite Can Be a Concern
Certain vermiculite insulation products may contain asbestos. Because there is no way to visually determine whether asbestos is present, vermiculite should always be treated as potentially hazardous.
Common Warning Signs
Loose, granular insulation in the attic
Homes built before the early 1990s
Insulation that has never been replaced or upgraded
What Homeowners Should Do
Homeowners should avoid disturbing vermiculite insulation. Professional assessment and removal are the safest options, especially before renovations or attic work.
