 What kind of gutters do you have? These are the box gutters that are built into the house from the slate. Okay, so basically the roof is sort of flat at the front edge and has a trough built into it where the water is supposed to collect and then run down towards the downspout? Yes, and I have like probably a three-foot soffit underneath it, you know what I mean, like a big overhang. They probably clog up at the spouts then because those holes are pretty small, even though you've got a big wide built-in gutter.