The best sealant to use around the exterior perimeter of a toilet base where it meets the floor is high-quality, mold-resistant silicone caulk or sanitary tub-and-tile caulk. Important Plumbing Note: Plumbers advise leaving a small 1-to-2-inch gap uncaulked at the very back lowest point of the toilet base. This intentional weep hole ensures that if the internal wax ring ever fails, water escapes openly onto the floor rather than remaining trapped invisibly underneath the porcelain bowl to rot your subfloor. Verification: Check that the caulk bead is smooth and waterproof.
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