Does tile size impact how level the subfloor needs to be?

Yes, tile size significantly impacts subfloor levelness requirements. Larger tiles are much more demanding and require flatter subfloors than smaller tiles.

Small tiles (2"x2" to 6"x6") are forgiving and can follow minor subfloor irregularities without cracking or lippage issues. The grout lines between small tiles help accommodate slight variations, and each tile can flex independently over small dips or humps. These tiles typically work fine with subfloors that meet standard 1/4" in 10 feet levelness requirements.

Large format tiles (12"x24", 24"x24", or larger planks) are extremely demanding on subfloor preparation. A 24" tile spanning across even a 1/8" dip will rock like a seesaw, creating hollow spots underneath that lead to cracking under foot traffic. Large tiles also show "lippage" more dramatically - where adjacent tiles don't sit at exactly the same height, creating tripping hazards and an uneven appearance.

Industry standards in Ottawa typically require subfloors to be level within 1/8" over 10 feet for large format tiles, compared to the standard 1/4" in 10 feet for smaller tiles. Some premium large tiles may require even flatter surfaces - within 1/16" over 10 feet. This often means extensive subfloor preparation including self-leveling compound, which can add $2-4 per square foot to your project cost.

The trade-off is worth considering - while large tiles create stunning, modern looks with fewer grout lines, they require significantly more subfloor preparation work. Small and medium tiles (8"x8" to 12"x12") offer a good compromise between visual impact and installation requirements.

For a professional assessment of your subfloor and tile size recommendations, request a quote from Ottawa Floor Install. A local contractor will evaluate your conditions and recommend the best approach.