Yes, a clogged roof vent pipe can indirectly cause a toilet to overflow or drain sluggishly. The plumbing vent stack allows air to enter the drainage system as water flows down, equalizing atmospheric pressure. When leaves, debris, bird nests, or ice block the roof vent, negative vacuum pressure builds up in the pipes, causing toilets and sinks to drain extremely slowly, gurgle loudly, or back up wastewater when other fixtures are used. Callout type="warning" title="Safety Warning": Exercise extreme caution if climbing onto a roof to inspect vent pipes. Verification: Check if multiple bathroom fixtures gurgle or drain poorly simultaneously.
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