✅ Follow @built.to.code for more tips. ❌ Never start laying mosaic on an uneven floor. Mosaic is installed on a very thin layer of thinset, so even small bumps are immediately visible — unlike regular tiles with a thick layer that hides unevenness. This feature makes surface preparation especially important. If the floor isn’t perfectly flat, the result will look messy, and even the most beautiful mosaic pattern won’t hide the bumps. ✅ The right way — prepare the surface first and use a self-lev