Can Clogged Gutters Cause Roof Leaks?
Updated
Short answer
Indirectly, yes. Water backing up in a packed gutter can wick behind the drip edge into the fascia and roof sheathing, and in winter a frozen gutter gives an ice dam a base; water behind the dam leaks into the attic, walls and ceilings (UMN Extension).
How water gets in at the edge
- Overflow running behind the gutter onto the fascia and into the soffit.
- Debris piled in valleys holding water against shingles and flashing.
- Ice dams, which form from heat loss but grow on a packed, frozen gutter.
What helps
- Clean gutters and valleys before winter.
- Make sure the gutter sits tight to the fascia under the drip edge.
- Fix attic air leaks and insulation; the Extension calls air leakage the major cause of ice dams in many homes.
See ice dams and gutters.
Quick answers
Can clogged gutters cause water in the attic?
In winter, yes, through ice dams: water backed up behind the ice leaks through the roof covering into the attic.
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