Step 5: Set the Outlets

Set the Outlets when installing fiberglass gutters
Photo: Anthony Tieuli
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At each downspout location, use a 2½-inch hole saw to cut through the bottom of the trough. Wearing latex gloves, squeeze a bead of fast-cure marine-grade polyurethane sealant onto the flange of the downspout outlet. Then, holding the outlet as shown, set it into the hole, sealant side down. Wait about an hour for the sealant to set before attaching the downspout.
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    Tools List

    • pencil
      Pencil
    • 30-foot tape measure
      Measuring tape
    • brad nailer
      Brad nailer
    • miter saw
      12-inch miter saw
    • four-foot level
      4-foot spirit level
    • chalk line
      Chalk line
    • dust mask
      Dust mask
    • latex gloves
      Latex gloves
    • eye goggles
      Eye protection
    • sandpaper
      80-grit sandpaper
    • respirator
      Organic-vapor respirator
    • drill
      Drill/driver
    • Painter's Tape
      Painter's tape
    • Natural-bristle chip brush
      Chip brush
    • utility knife with hook blade
      Utility knife
    • hole saw
      2 ½-inch hole saw
    • nut driver
      Nut driver

    Shopping List

    Fiberglass gutter

    5/4x6 cellular PVC trim

    18-gauge stainless-steel brad nails

    3 -inch stainless-steel structural screws

    Stainless-steel sheet-metal screws with hex washer head

    Superglue

    Acetone

    Fiberglass mat

    Polyester resin and hardener

    Gelcoat

    Fast-cure marine-grade polyurethane sealant

    Microballoon filler