Roof Vent Leak From Snow

Snow can get into any weak areas on the roof as the melting causes ponding which seeps into the building.

Roof vent leak from snow.

Similar to attic frost related leaks this problem is related to the accumulation of frost inside an exhaust vent commonly a bath vent duct where it travels through an unheated attic. Look to see if the fasteners are still in place. You should inspect your ridge vent annually. Inches of snow adds weight to your flat roof as the extra weight can cause sagging and leaking before it ultimately collapses from too much distress.

Leaks due to snow or rain driven into the attic through louvres or vents acceptable performance condition attic vents shall be installed in accordance with the building code and prevent the entry of rain snow and insects. Another problem with snow is it could melt and refreeze. There should be a fastener every 18 inches. Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing.

While you are on the roof walk along the entire length of the ridge vent. These boots vary in quality flexibility and longevity. To do that install insulation or more insulation in the attic floor and keep it out of the eaves and soffit vents. Can snow cause your roof to leak.

The roof must be made colder. If the fasteners are not secure a strong wind may pull up the ridge cap and let rain or snow get into the vent causing it to leak.