How to cut a miter on a seamless gutter

Written by william machin
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How to cut a miter on a seamless gutter
Square or half-round gutters are mitred on a mitre jig. (Dachrinne image by crossgolfing from

Seamless rain gutters are manufactured using galvanised metal and PVC plastic. Most manufacturers produce outside and inside corners to make gutter and downspout installation more efficient. Connecting lengths of gutter to corner pieces requires a mitre cut for a proper attachment. You can make the mitre cuts with a hacksaw.

Skill level:

Things you need

  • 2-by-6-inch utility lumber
  • Handsaw
  • 2-by-4-inch utility lumber
  • Table saw
  • C-clamps
  • 1-by-8-inch utility lumber
  • Wood glue
  • Cordless drill with screw top
  • 1-inch wood screws
  • Mitre gauge
  • Seamless gutter
  • Hacksaw

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  1. 1

    Cut a piece of 2-by-6-inch utility lumber 6 feet long with a handsaw. Cut a piece of 2-by-4 inch utility lumber 6 feet long. Set up a table saw and rip the 6-inch wide piece to 5 inches wide to equal the inside width of the gutter trough.

  2. 2

    Apply wood glue on the face of the 4-inch-wide piece and position it along the centre line of the 5-inch wide piece. Use C-clamps to hold the attachment for two hours or until the glue is dry. The laminated pieces combine to make a jig that's 3 inches deep.

  3. 3

    Turn the laminated pieces over so the 5-inch-wide piece is on top. Cut a piece of 1-by-8-inch utility lumber 6 feet long as a base for the mitre jig. Apply wood glue to the 5-inch piece and position the 8-inch-wide base along the centre line of the 5-inch piece. Use a cordless drill and screw tip with 1-inch wood screws to attach the base to the 5-inch piece.

  4. 4

    Turn the jig over and mark the centre of the jig from end to end. Set up a mitre gauge on the table saw and set the depth of the saw blade to 3 inches. Make 45-degree cuts in opposite directions on each side of the centre mark as blade guides for a hacksaw blade.

  5. 5

    Stabilise the base of the jig on sawhorses or a workbench. Turn a length of seamless gutter over and mark the point of a right or left mitre cut. Position the gutter on the jig and align the mark with the appropriate 45-degree hacksaw blade guide. Make the desired mitre cut with a hacksaw.

Tips and warnings

  • Rip the 4-inch-wide piece to 2 inches wide for mitre cuts on half-round gutters.

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