Here are some additional frequently asked questions about masonry work: Many people ask if tiles can be directly laid on top of old floor tiles. Actually, as long as the original floor is free of hollow areas, cracks, and is level, you can skip the removal process. However, the height will increase, so pay attention to the tiles and the finishing. Some people worry that large tiles are more prone to warping. The key is the adhesive, leveling, and installation technique, not the size itself. Also, how high should waterproofing be done in the bathroom? Generally, it should extend at least 120 cm from the floor, and 180 cm in the shower area for a more secure result. Finally, a common question is how long the project takes. Laying tiles on a small floor usually takes about 3-5 days. If removal, leveling, grouting, and curing are included, the time will be longer.