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Unclog the Drain — Flushing the Vent with Water

Intermediate6 hours

Part of project

How to Clear a Clogged Plumbing Vent Stack on Your Roof · Step 3 of 5

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In this video

Slowly turn on the water at the faucet. You will hear the water filling the hose and the bladder will begin to inflate, creating a seal against the inside of the drain pipe. Once sealed, a powerful jet of water will shoot out of the tip of the bladder, forcing the clog down the drain. You will likely hear a 'whoosh' or change in sound once the clog is cleared. Turn the water off immediately after the clog is cleared.

Goal: Clear the clog with water pressure

  • Be prepared for some water to potentially splash back. Stand clear and operate the faucet carefully.
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FAQs

What are the most critical safety precautions I should take before climbing onto my roof?

Safety is paramount for this project. Always use a sturdy ladder placed on stable ground and ensure it extends at least three feet above the roofline. Wear slip-resistant footwear, like the Shoes For Crews listed, and consider having a spotter or using a safety harness, especially on steep or high roofs. Avoid working alone, in bad weather, or when fatigued.

How can I be sure my plumbing issue is a clogged vent stack and not a different problem?

Common signs of a clogged vent stack include slow drainage, gurgling sounds from drains (especially after flushing a toilet), and the presence of sewer gas odors inside your home. These symptoms are usually more pronounced in fixtures closest to the vent stack or on upper floors. If multiple drains are completely backed up, it might indicate a main sewer line clog instead.

Do I really need specialized tools like the NITECORE tactical flashlight or a 50 ft drain auger?

Yes, specific tools are crucial for effectiveness and safety. A powerful tactical flashlight is essential for illuminating the dark interior of the vent stack to identify blockages or assess damage. The 50 ft drain auger is necessary to reach deeply lodged clogs that might be far down the stack, beyond what a shorter auger could manage. Using a garden hose with a strong spray nozzle is also vital for flushing.

What if I can't clear the clog with the auger or water, or if the problem persists after following the steps?

If you've thoroughly attempted to clear the clog using the auger and water pressure without success, the obstruction might be too dense, located further down in the main drain line, or the vent stack itself could be damaged. In such cases, it's best to contact a professional plumber. They have specialized equipment like camera inspections and more powerful drain-clearing tools to diagnose and resolve complex issues.