Roof Vent Blocked By Snow

Snow ingestion can become a problem at roof ventilation openings.

Roof vent blocked by snow.

Wouldn t installing a vent that will continue letting air in even though it blocks the snow short circuit the stack effect and render the soffit vent useless. Wind baffles are effective at directing wind blown snow up and over ridge vents 11. What if snow on the roof clogs the vent pipe. I use the snow on the roof as an indicator of where heat is building up in the attic.

If your plumbing vent pipes are clogged with snow or any other object the blockage may put your health. An under sized plumbing vent less than 2 diameter or too short above the roof line can become blocked by frost in the vent line above the roof blocked by snow cover or have its gases blown down to a lower level by cold or varying air movement. When the attic becomes too warm due to closed vents snow and ice on the roof readily melts. This causes free flowing water to run between shingles and down to the gutters.