How to Install Half Round Gutters and Downspouts


Gutters are not usually the first thing someone notices on a home, typically just a necessary feature to prevent erosion and leaky basements. Unlike standard gutters, half round gutters help protect the value of the home by preventing water damage and can also increase curb appeal and market value due to their different design.

Things You'll Need

  • Tin snips
  • Screwdriver
  • Power drill
  • Drill bits
  • Screws
  • Sealant
  • Chalk gun
  • Caulk line
  • Hacksaw
  • Pop rivet gun
  • Pop rivets
  • Pencil
  • Level
  • Hole saw
  • Downspout brackets
  • Downspout outlet
  • Gutter endcaps
  • Fascia brackets
  • Gutter
  • Repair or replace any rotten or damaged fascia board prior to beginning installation.

  • Measure the length of gutter needed for the first run. Factor in the additional length for end caps and be aware of which ends will be mitered to another run, requiring a 45-degree angle cut with a hacksaw.

  • Cut the gutter to length with a hacksaw or tin snips. Gutter pieces longer than the standard length require connecting two pieces together by overlapping 8 inches at the end and securing the sides with two rows of 3/8-inch, self-tapping steel screws or pop rivets. Attach end caps with screws or pop rivets and seal with siliconized caulk to prevent leaks.

  • Create a four-inch downspout opening by tracing a downspout outlet onto the bottom side of the gutter run. Using a hole saw, make an opening where the downspout needs to go. Attach the downspout in a later step.

  • Determine proper gutter placement on the fascia with a level and tape measure. Add a chalk line to guide gutter hanger installation. The highest point on the gutter should sit at 1 1/4 inch below the roof line and proper slope should be 1/2 inch from start point to end point. Screw hanger brackets into the fascia with 1/4-inch stainless steel lag screws, spaced approximately 16 inches apart into the tail of the roof rafter.

  • Place gutter runs into the hanger brackets and rotate upward until the back side of the gutter snaps into place under the bracket hook. Secure the run by creating a starter hole and drilling a smaller screw into the hole on each bracket.

  • Connect the 45-degree corner pieces of gutter by attaching a three-inch-wide strip of aluminum to the underside with sheet-metal screws or pop rivets. At the top of the gutter, split the strip of aluminum with tin snips and fold each half over the top of the gutter edge. Seal with siliconized caulk.

  • Attach the downspout outlet with four small screws or pop rivets, then attach the downspout with the same. Secure the downspout to the home with pre-fabricated brackets and screws for stability.

Tips & Warnings

  • Half round gutters are not designed as efficiently as standard K gutter styles and are not equipped to handle heavy rains.


  • Photo Credit Hemera Technologies/ Images
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