The entire function of gutters is to lead water into a designated drainage area somewhere on your property. What happens if they remain clogged with debris?
If gutters are clogged, when the rain comes, it will spill onto the building and remain sitting still in the gutter after the rain has passed. The sitting water could cause wood rot and ruin the soffit boards. Continuous moisture can all lead to a decline in the structural integrity of the gutters attached to the home.
If gutters remain clogged with leaves, dirt, gunk, (snow if it’s that time of year) in the gutter channel, water will back up and spill down to the foundation. The spilling water will weaken the ground under and around your home, which can lead to foundation cracks.
If it is winter season and the foundation is wet and then freezes, the moisture will freeze and expand, causing cracks in the foundation. In extreme cases, water damage can cause structural failure in a building.
If gutters do not drain, water will migrate into the house and result in ceiling leaks, wall leaks, and added moisture to the attic.
Summer around the corner means the bugs are coming out to play. The debris in gutters, especially when wet, is a very attractive habitat for insects. Still-waters uninterrupted are great breeding grounds for mosquitoes.
The water that falls from obstructed gutters can kill plants and grass living below. When those plants die, their roots no longer contribute to holding your yard in place. Erosion will take place, and your yard could shift around.