Clogs in Plumbing Vents
Plumbing vents are pipes that run from sinks, toilets and other fixtures to a vent stack on the roof or other outdoor location. According to Plumbing Knowledge, the vent stack pipe should measure 4 inches in diameter and extend 1 to 2 feet above the roof. The vent system maintains air pressure levels which allow gravity to pull waste through the pipes. Vents also prevent a siphoning effect that can empty plumbing traps and allow sewer gas to back up into the home. When a plumbing vent becomes clogged, the change in air pressure can cause slow drains and other plumbing problems. Does this Spark an idea?
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Causes
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If the vent stack is too narrow or too short, it can quickly become clogged with ice or snow during the winter. As hot water runs through plumbing pipes, steam which flows into the cold vent stack can freeze and block the opening. Bird and insect nests, leaves, branches or animals can clog a vent. Inspectapedia states that the plumbing material itself can deteriorate and clog a vent, or the screen at the top end of a vent can slip and close off the vent.
Detection
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A clogged vent pipe can cause slow drains and backups in multiple fixtures on one side of the house. Bubbles may appear in the water as you flush your toilet or a gurgling sound may occur in one fixture as another fixture drains. A sewer gas odor may be present near sinks, toilets or other plumbing fixtures. Plumbing Basics states that if the vent stack on the roof is clogged, it will not produce steam while hot water is running.
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Solution
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If you can safely climb a ladder to get onto the roof, you can remove snow that is blocking the vent opening or use an auger to break up a clog in the vent pipe. According to Plumbing Basics, the clog is often just under the intersection of the roof and the vent opening. If parts of the clog remain after you use an auger, you can insert a hose into the pipe and wash away remaining debris. Steam will flow from a cleared vent stack as you run hot water. A plumber can replace a vent stack that is too narrow, too short or otherwise defective.
Considerations
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A clogged plumbing vent can allow highly toxic and explosive gasses, such as methane and hydrogen sulfide, to enter your home. Inhaling these gasses can cause death. Sewer gas may also contain bacteria and mold spores which can cause sinus infections and other health problems. According to Acme How To, chemicals are not effective against plumbing vent clogs. Do not attempt to climb onto your roof during inclement weather.
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References
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