It is seldom that a vent stack becomes clogged up, and so when one does you may be rather mystified. Other plumbing breakdowns generally make their presence known immediately. If a fixture becomes flooded, you know there is a stoppage in a waste line. If all the fixtures flood, you know the stoppage is in the soil stack or sewer line.
If odors of air indescribable nature seem to be prevalent in your bath room, kitchen, or any other location where plumbing fixtures are, it is possible that a stopped-up vent is the cause. The top-floor fixtures are the ones more often affected. Go up to the roof and check the man vent of the house. Note whether or not vapours seem to be coming out of the top of the vent stack. The best way to create vapours in your plumbing system is to run the hot water the hot water running into cold waste pipes will thrown off considerable vapour. If the vent is open, you will see these vapours coming out. If no vapours emerge, your vent stack is probably clogged up. The vent clogs in various ways and for various reasons.
The Stoppage usually occurs just below the roof where the vent pipe is offset. One way of clearing stoppages is to run an auger or clean out were from the vent opening on the roof. You may or may not know whether the stoppage point has been reached and broken through. Test the system again by on hot water. If vapours are seen rising, vents are open.
Another way of cleaning a stoppage is to insert the end of a hose at the top of the vent and flush the vent thoroughly. This is sometimes advisable after breaking a stoppage with an auger of clean out wire.
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