What is included
A scope built around the room.
- 01Slab moisture and RH testing
- 02Levelling and slope correction
- 03Insulated subfloor panel systems
- 04Vinyl plank, tile and engineered wood
- 05Basement apartment turnovers
- 06Floor drain and sump considerations
Test the slab before choosing anything
Concrete releases moisture vapour for a long time and an old slab under a house with poor drainage can be releasing it continuously. Flooring products state a maximum, tested either by in-situ relative humidity probes drilled into the slab or by a calcium chloride emission test, and the requirement varies by product and adhesive. This is a cheap test compared to lifting a failed floor. If the reading is over the limit, the answer is a moisture mitigation coating or a different assembly, not a hopeful vapour barrier.
What actually belongs below grade
Vinyl plank, tile and engineered hardwood are the three finishes that work reliably below grade. Solid hardwood does not belong on a Toronto basement slab. Laminate is a gamble in any basement with a moisture history because of its fibreboard core. Carpet works in a dry, conditioned basement with the right cushion, and is a poor idea in one that has ever taken water. We say which of these your basement supports after we have looked at it, not before.
Warmth, and why the subfloor layer is worth it
A slab sits at ground temperature year round and pulls heat out of the room, which is why a basement can be well heated and still feel cold underfoot. An insulated subfloor panel system, or a sleeper and plywood assembly, breaks that thermal bridge, provides an air gap for drying and gives a warmer, quieter floor. It costs more and it raises the floor height, which has to be checked against stair rise, door heights and ceiling clearance in a basement that may already be tight.
Slope, drains and old slabs
Many Toronto basement slabs slope toward a floor drain, are dished in the middle, or have a patched trench from a plumbing or waterproofing project. Levelling compound fixes deviation, but filling a slope to a drain means deciding whether that drain is still needed, and burying an active floor drain is a decision for the owner, not the installer. We map the high and low points with a laser, show you what levelling will cost, and where a slope must be kept we plan the layout around it.
Basement apartments and rental units
For a legal basement apartment, the flooring choice interacts with fire separation and sound requirements between units, and any assembly used for a rated separation cannot simply be changed on site. Practically, tenants and hard-wearing surfaces go together: vinyl plank in the living areas and tile in the wet areas is the combination that turns over cleanly between tenancies. Keeping spare planks from the same lot makes future single-plank repairs possible.
Standards and references
Where we cover
Basement floors across the GTA.
Questions