How to Keep a Sewer Vent Open

Climb up onto the roof of the house to assess the problem. If you suspect methane gas is seeping into the home, it's very likely the sewer vent is clogged and must be cleared. Use an extension ladder to access the roof, making sure to avoid any power lines or other hazardous elements that could pose a threat to safely reaching the sewer vent.

Locate the sewer vent. Most vents are made of a plastic or metal pipe that extends from the roof and can be found above the closest bathroom. Remove the vent cap and look into the vent pipe with a flashlight for any clogs such as leaves, nesting materials from birds or mice or even a dead animal carcass. If close enough to the pipe mouth, reach in and remove the debris. Sometimes a water hose is best suited to clearing the clog. Stick the hose inside and try to snake the clog free. If that doesn't work, turn it on full blast. The water level will rise and then fall when the vent is opened back up.

Clear the vent of snow or ice. Inclement weather can cause clogs outside and inside the vent. Heavy snow can accumulate over the vent and cause a blockage. Use a roof-rake or shovel to dig it free again. Low temperatures can sometimes cause ice to freeze inside the vent and plug it up. Poke a sharp stick through the ice or in severe conditions, try salt and hot water.