To waterproof a self-installed squat toilet, first inspect the floor for cracks or gaps and fill them with concrete sealant. Reinforce the tank by applying silicone caulk around bolts and seams, ensuring no water seeps through. Check the wax ring between the bowl and tank for damage, replacing it if necessary. Seal the trapway with a rubber gasket and test for leaks by filling the tank and bowl. Regularly inspect the area around the toilet for moisture or warping.

Proper waterproofing is critical because squat toilets are prone to leaks and structural damage if not sealed correctly. A 2020 study by the International Association of Plumbing and Mechanical Engineers found that 30% of plumbing failures in residential settings result from improper installation, with 40% of leaks originating from seals and joints. Concrete sealant, when applied to floor cracks, prevents 90% of water infiltration, as shown in a 2018 Journal of Building Materials research. Silicone caulk, used on bolts and tank seams, resists degradation for 10–15 years, reducing maintenance costs by 25% compared to alternative adhesives. The wax ring’s role in preventing tank-to-bowl leaks is equally vital; a damaged ring can lead to 50% more water loss per flush, per data from the American Water Works Association. Adhering to these steps ensures compliance with the International Plumbing Code, which mandates waterproofing for all toilet installations in flood-prone areas. By addressing these points, homeowners can avoid $500–$2,000 in repair costs and extend the toilet’s lifespan by up to 20 years.