To install a gutter downspout, trace the end of the downspout on the gutter, drill a small hole into the center of the circle, and then cut it out. Once the gutter is installed, attach the elbows and downspout with screws or pop rivets, and then add brackets.Continue Reading
Turn the gutter upside down, and trace a circle around the inside of the downspout outlet on the lower end of the gutter.
Drill a preliminary 1/4-inch hole in the center of the circle. Then, cut out a 4-inch diameter hole with a hole saw attached to a drill.
Insert the downspout outlet into the hole in the gutter, and attach it with four screws or pop rivets.
Attach an elbow to the protruding end of the downspout outlet. Place another elbow against the house, and measure a downspout to fit between the two elbows.
Using needle-nosed pliers, crimp the ends of the elbow to fit in the downspout. With pop rivets or screws, secure the elbows and the downspout.
For a one-story house, attach two downspout brackets; for a two-story home, use three brackets.