Accumulations of snow sufficient to block the pipe may be more common in newer housing that utilizes PVC vent pipes instead of older cast-iron pipes. Snowfall or sleet may be heavy enough to block the pipe as well.Over time, layers of frozen condensation may enlarge to block the pipe. As this ari contacts cold outdoor air at the rooftop vent opening, condensation forms on the inside of the pipe and freezes. Warm, moist air from inside the pipes is emitted by the vent pipe.Here’s how winter weather can conspire to form sewer vent blockages: Sewer vent blockages are more common in winter weather, however, particularly when freezing temperatures, snow, and ice are present. At these rooftop sewer vents, blockages can happen at any time of the year from the accumulation of leaves, bird nests, bee hives, or other issues. In most houses, sewer vents are 3- or 4-inch pipes routed in wall voids into the attic and through the roof where they terminate into outdoor air. This gas can present health issues, not to mention noxious odors. Plus, blocked or damaged vents force toxic sewer gas out of other outlets, including drain openings inside the house. Without it, wastewater flowing through the system is inhibited.ĭrains and toilets may run slow or malfunction, and sewage could even back up into the home. Venting is vital to the proper functioning of drain pipes and household sewer systems. Sewer vents aren’t a topic of casual conversation in most homes.
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