What a blocked gutter actually does
The damage runs in a predictable sequence, and most of it is more expensive than the gutter.
- Water backs up over the rear edge of the gutter and soaks the fascia board, which rots
- From the fascia it reaches the roof deck edge and the ends of the rafters
- Overflow runs down the wall, staining siding and getting behind it
- Water discharging at the foundation finds its way into basements and crawl spaces
- In winter, standing water in a gutter freezes, and the weight pulls the gutter off its fixings
- A full gutter is heavy enough on its own to sag and separate at its seams
