19. Gutters Overflowing? Upsize the Downspout
A long gutter (e.g., 50 ft) with a single 2×3-in. downspout will often overflow in heavy rain.
If you can’t add another downspout, upgrade to a 3×4-in. downspout in the same location.
- Remove the existing downspout and old drop outlet.
- Use the new 3×4 drop outlet as a template and trace the larger hole.
- Cut the hole with tin snips or a multi-tool with a metal blade.
- Install the new outlet and downspout with sheet-metal screws.
- Seal the outlet to the gutter with seam sealer.
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