Large-Format Basement Floor

A finished basement with a calm grey floor, levelled over an uneven slab and ready for electric heating.

The slab in this basement dipped by nearly an inch toward the floor drain, which would have been obvious under big square tile. We tested for moisture, levelled the low area and added an uncoupling membrane over the hairline cracks.

Electric heating mats went down in the main living area and were tested before and after tiling. At the stair landing we changed to a one-third offset rectangle for variety, and the owner’s electrician made the final connection to the thermostat.