As warm moisture laden air rises through the vent the cold outside temperature causes it to condense and freeze on the vent line eventually plugging it.
Vent pipe on roof frozen.
Look also for short plumbing vent stacks above the roof line they can be covered and blocked by snow.
Its drainage and vent functions are actually two systems.
You will have the best success if you remove the melting water with a shop vac.
If you live in a cold weather environment your sanitary waste system s roof vent line probably freezes in the winter.
Sewer vent pipes are on the roof of homes and other buildings.
Both the salt and hot water options will work eventually but i think the hot water will work the best aside from the mess.
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You can bring a small heater up on the roof and direct the heat into it may help.
If it s a plumbing vent diameter problem in a freezing climate you ll see the vent basically blocked by frost above the roof line.
Typically the short smaller diameter vent pipes less than 4 inches can freeze shut.
The vent stack is the pipe leading to the main roof vent.
It channels the exhaust gases to the vent and helps maintain proper atmospheric pressure in the waste system.
As you know the plumbing vent on the roof is needed to supply air to the plumbing system so the use of one plumbing fixture does not pull air from other plumbing traps inside the house and possibly suck them dry.
Why plumbing air vents are important.
Vacuum is the culprit the weather had been cold and moisture vapor escaping from the house system up the plumbing vent began to freeze when it came into contact with the cold metal of the plumbing vent on the roof.
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The diameter of the vent pipe varies from 1 1 2 to 6 inches.
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Sewer vent pipes on the north side of the roof also may be more prone to frost plugging than those on the south side of the roof.
