Waterlogged leaves can grow too heavy for gutter troughs, and they can make your gutters start to bend. Even the most well-cleaned gutters can start to sag because of extreme temperature changes, harsh winds, and other elements wreaking havoc. One of the best ways to prevent sagging gutters before they start to split or break is to make sure the fasteners are firmly in place and are well reinforced (even adding a few more fasteners can help). Most gutters have spikes holding them in place or brackets underneath them to support the weight. Here's how to replace each type of fastener.