Water spilling over a gutter during heavy rain is easy to spot, but it doesn't tell you the exact cause. A blockage is common; however, gutter fall, joints, downpipes and the condition of the roofline can also matter.
Leaves and moss inside the gutter
Leaves can collect where trees overhang a roof, while loose moss and other debris may wash down from the tiles. Over time this can slow the flow of rainwater, especially near outlets.
A blocked downpipe
Water may back up if material becomes lodged near the downpipe opening. Explain where the overflow occurs and whether it happens along the whole run or in one place. Don't assume clearing the visible trough alone will resolve every drainage issue.
Incorrect slope, leaks or damage
A sagging section, separated joint or poor fall can cause overflow even if the gutter looks relatively clean. These may require adjustment or repair rather than just debris removal.
Could heavy rain be the only reason?
Very intense rain can overwhelm some systems temporarily. Repeated overflow during ordinary rainfall is more useful evidence of a persistent issue.
What to do next
From a safe position on the ground, note the location of the overflow and whether there is visible vegetation or damage. Don't climb onto a roof or reach out of an upstairs window to clear it yourself. If water is entering your home or there is significant damage, arrange appropriate professional assessment promptly.
You can ask about gutter clearing or read when gutters usually need attention.
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