Asbestos floor tiles: what to know before you pull them up
Updated July 30, 2026 · 2 min read
Vinyl and asphalt floor tiles made through the 1980s frequently contain asbestos, and so does the black mastic adhesive underneath them. This is one of the most common asbestos materials in Ontario homes, and also one of the most commonly disturbed — because pulling up old flooring feels like the simplest job in a renovation.
The nine-inch clue
Tiles measuring 9 by 9 inches are a strong signal: that size was largely phased out as asbestos use declined, so a 9-inch tile is usually old enough to be suspect. Twelve-inch tiles can contain asbestos too — they are just less reliably an indicator.
The black, tar-like adhesive underneath deserves as much attention as the tile. Cutback mastic frequently contains asbestos, and it is often still there long after someone has removed the tiles above it and assumed the problem left with them.
Intact tile is not the emergency
Floor tile is non-friable — the asbestos is bound in the material and does not readily become airborne. A sound tile floor you walk on is not filling your home with fibres, and in many cases the reasonable answer is to leave it and cover it.
Encapsulation is a legitimate approach: a new floor installed over the old one, with the tile left undisturbed underneath. It is often cheaper, faster and safer than removal, and it is worth asking about before assuming everything has to come out.
The removal is what creates the risk
The moment tile is broken, snapped, chipped or ground, it stops being non-friable in any meaningful sense. Every method that makes removal fast is the method that makes it dangerous.
Grinding or sanding mastic is the worst of these and produces very high fibre concentrations. A tile floor coming up cleanly, in whole pieces, kept damp, is a completely different job from the same floor attacked with a grinder.
- No grinding, sanding or dry-scraping of tile or mastic
- No demolition hammer or floor scraper machine on untested tile
- No household vacuum on the debris
- No throwing the pieces in a regular bin — this is regulated waste
How it is actually done
Tested first, so the method is chosen against a real result. Then the work area is separated from the rest of the building, the tile is lifted whole where possible and kept wet, waste is bagged and labelled as it comes up, and the floor and air are cleaned before anyone reoccupies the space.
In an occupied building — a school, an office, an apartment — the schedule matters as much as the method, and the work is often done outside operating hours so the space is clear and verified before people return.
The takeaway
Old floor tile and the black mastic under it are usually low risk while intact, and covering them is often the sensible answer. If they do have to come out, test first and remove them whole and damp — the crowbar and the grinder are what turn a manageable material into an exposure.
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