When tiling a floor, tile spacers are necessary to ensure that your tiles have a uniform gap between them, leaving enough space between them for applying grout later on. If you don't leave this gap, your tiles will be more susceptible to breaking and popping out. Over time and in certain temperatures and weather conditions, tiles will expand and contract, which is why making a clear space between them is so important. If this process is not adequately completed, your tiles will not last the course, causing a need for tile removal and re-laying in your area.