Yes, a toilet will leak wastewater and sewer gases directly onto your bathroom floor every time it is flushed if it is not properly sealed from the bottom. The wax ring or rubber gasket compressed between the underside of the porcelain bowl outlet and the floor flange creates a crucial watertight barrier. Without this seal, flush water escapes laterally out of the joint, seeping into your subfloor and floor joists. Verification: Inspect the connection point between the bottom porcelain bowl and the floor during a flush cycle to check for escaping water.
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