Fixing leaky joints Over time, the joints between lengths of gutter can fail. And even seamless gutters aren't immune to drips. They have seams where the gutters connect to preformed corners and to downspout outlets. Whether it's a corner or straight joint, the repair is pretty much the same. Curing sagging gutters Most gutters are held in place with large spikes that pass through tubular sleeves, called ferrules. When a spike pulls free, a gutter can sag and, in some cases, come crashing down. To repair a sagging gutter, you have to replace the spike with something that won't withdraw easily, in this case, 7-in.-long FastenMaster Gutter Screws ($10 for a 10-pack).