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Clear the Blockage in the Vent Stack — Flush the Vent with a Garden Hose

Intermediate6 hours

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

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In this video

If plunging does not resolve the issue, the plumbing vent stack on your roof may be blocked. Carefully use a sturdy ladder to get onto your roof and locate the vent stack pipe. Using a flashlight, look down into the pipe to identify any blockages, such as leaves, debris, or animal nests. Use a drain auger to break up and remove the obstruction, restoring proper airflow to your plumbing system.

Goal: Remove vent stack blockage

  • Always prioritize safety when working on a roof. Do not attempt this in wet or windy conditions. If you are unsure, call a professional.

Used in this video

  • Ladder (brand: Not specified) — Safely accessing the roof
  • Flashlight (brand: LitezAll, Flashlight_Type: Handheld) — Inspecting the inside of the vent stack for blockages
  • Drain auger (brand: Not specified, Auger Type: Drain auger) — Clearing blockages from the vent stack
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FAQs

What are the most common signs that my plumbing vent stack is clogged, and not just a regular drain?

Common signs include multiple slow drains throughout your home, gurgling sounds from various drains or toilets, or a persistent sewer gas odor. If these symptoms appear in several fixtures simultaneously, it's a strong indicator of a main vent stack blockage rather than a localized drain issue.

How do I safely access my roof to clear the vent stack, especially if I'm not comfortable with heights?

Always use a sturdy extension ladder, like the XTEND+CLIMB 760P+, ensuring it's on level ground and secured. Wear slip-resistant shoes (e.g., Shoes For Crews) and consider having a spotter to stabilize the ladder. If you're genuinely uncomfortable or inexperienced with roof work, it's safer to call a professional.

What if my garden hose isn't long enough or powerful enough to clear the blockage in the vent stack?

If a standard hose like the GardenJoy 5/8 in. x 50 ft. doesn't reach or clear the clog, consider using a longer, more flexible hose like the Pocket Hose Silver Bullet 100 ft., which is designed to be kink-free. You might also need to use the drain auger (THEWORKS 3/8 in. x 25 ft.) as the next step for more stubborn blockages.

What should I do if the drain auger gets stuck in the vent pipe during the clearing process?

If the auger gets stuck, try gently rotating it counter-clockwise while pulling back to disengage it from the blockage or a pipe joint. Avoid excessive force, as this could damage the pipe or the auger itself. If it remains firmly stuck, do not force it; you may need to call a professional.

Transcript
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If this doesn't work, clear the blockage in the vent stack. To do this, use these steps. Using a sturdy ladder, access your roof to locate the vent stacks. Using a flashlight, look down the vent stack and remove any blockages with a drain auger. And there you have it.

Auto-generated transcript. May contain errors.