You can determine if a toilet is leaking into the subfloor by checking for structural warning signs around the base and surrounding room. Key indicators include soft, spongy, or sagging flooring directly around the toilet base, discolored or warped laminate/hardwood panels, dampness that reappears after wiping, and a toilet bowl that rocks or shifts when sat upon, which indicates wood rot beneath the floor flange. Callout type="warning" title="Hygiene Warning": Wear rubber gloves when inspecting water-damaged subfloors. Verification: Press firmly on the floor around the toilet base to check for structural firmness and stability.
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