Gutter Overflow And What It Does To The Fascia And Soffit

The anatomy

At the eave, from the outside in: the gutter, hung on the fascia board (the vertical trim that the gutter attaches to), and behind and below that the soffit (the horizontal underside of the overhang, usually vented). The roof's drip edge sits over the top of the fascia and is meant to put water in the gutter. When the gutter overflows or leaks behind, the fascia gets wet from the front and the soffit gets wet from above.

How to tell it is the gutter

• The staining is on the soffit at the eave, not further up the wall or on the ceiling inside.
• It gets worse in heavy rain, not in light rain (a roof leak often does the opposite).
• There is a tide line or streaking on the fascia below the gutter.
• The gutter above the stain is visibly full, sagging, or holds water after rain.
• Paint on the fascia is peeling in a band, or the fascia feels soft when pressed.

What happens if it continues

Fascia is wood or wood composite. Kept wet, it rots - and the gutter hangers are screwed into it, so as it rots the gutter loses its attachment, sags further, holds more water, and overflows more. The soffit, if wood, follows. Behind the fascia is the end of the roof rafters or trusses, and water that gets into the fascia can reach those. What began as a clogged gutter becomes a carpentry job.

The cheap fixes

Clear the gutter. Check the outlets and downspouts are open. Check the gutter has fall towards the outlets and does not sag between hangers. Check the drip edge extends into the gutter. Most overflow is one of those four.

When it is not the gutter

Sometimes it is the roof: a short drip edge, underlayment that stops short of the edge, or a tile-roof eave closure that has failed. Those are roof repairs, scoped separately. Distinguishing them from gutter overflow is exactly the kind of thing that is obvious from the roof and impossible from the ground - and it is noted in the report either way.

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