Blocked Roof Gutters Cost You Money! especially during the winter months. When the temperature drops, standing water turns to ice, which causes damage. If your gutters are blocked and/or damaged, they’re going to overflow. If that happens, the first casualty will be blemished exterior wall coatings and masonry. Ugly watermarks that tell the world you don’t really care about the state of your property. Less obvious will be the seepage into the building’s interior, which can cause serious structural damage that rarely reveals itself until it reaches an advanced stage.