How to Repair an Aluminum Gutter

Updated February 21, 2017

Gutters protect your home's exterior and the ground above your foundation from the damaging effects of rain running off the roof. Aluminium gutters can rust over time and develop small holes. Another common problem with aluminium gutters is loose and leaky joints. Joints are repaired with a rubberised roofing sealant. Regular maintenance and repairs help increase the life of your gutters and protect your home from water damage.

Clean out the length of gutter in need of repair using a gutter scoop. Leaves, dirt and other debris build up in gutters. In order to repair the gutter, it needs to be clean and dry.

Brush the rusted holes in the gutter with a wire brush to remove all of the rust. Dry the gutter with cloth rags.

Put on work gloves. Fit a section of aluminium flashing over the holes in need of repair on the inside of the gutter. Use the aviation snips to cut the flashing so that it will overlap the hole by 1 inch on all sides. Repeat for each hole in need of repair.

Apply a bead of roofing cement around the perimeter of the aluminium flashing patches. Align the flashing over the hole, with the cement facing the inside of the gutter. Press the patch firmly into place.

Identify any leaking loose joints along the gutter. Clean the joints out and dry them with a cloth rag. Apply a thick bead of rubberised roofing sealant across the entire joint to seal it.


Clean and inspect your gutters at the beginning and end of each season to ensure that they are clear of debris and in good condition.

Things You'll Need

  • Gutter scoop
  • Wire brush
  • Cloth rags
  • Work gloves
  • Aluminium flashing
  • Aviation snips
  • Roofing cement
  • Rubberised roofing sealant
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About the Author

Jonah Morrissey has been writing for print and online publications since 2000. He began his career as a staff reporter/photographer for a weekly newspaper in upstate New York. Morrissey specializes in topics related to home-and-garden projects, green living and small business. He graduated from Saint Michael's College, earning a B.A. in political science with a minor in journalism and mass communications.