There are several principal causes of gutter back flow.
Gutter leaking between gutter and fascia.
Have rain water dripping out from between your facia and gutters.
On some homes water tends to drip behind the gutters down the fascia and soffit and then either down the side of the house or straight to the ground.
Usually this is due to gutter fasteners rusting.
Other than being old and rusty they are working fine based on my obser.
Assuming the gutters have the correct slope the main reason for overflows is that the gutters are full of debris and need to be cleaned.
This can be frustrating and also creates a dangerous situation on porch steps during freez.
Over time rain gutters often start to pull away from the roof allowing water to drip over the gutter sides or between the gutters and the walls.
But what happens when your roof s gutters become worn out or cracked or clogged.
Water leaking in behind the facia of your roof could be caused by a couple of things.
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Backflowing gutters is a term we coined to refer to the problem that occurs when water falling off the roof edge runs behind the gutter or between the gutter and the building fascia rather than falling into the gutter.
The gutters then direct the water to a downspout allowing the water to run down until it reaches the ground.
If you re not closely attuned to the behavior of your home s water drainage system you may not notice this occurrence.
Water leaking between gutter and fascia when there is rain the water is expected to roll down the roof and into the gutters.
Unfortunately it doesn t always work that way.
If the water is coming from a leak between the gutter and the fascia it is very likely that this is a gutter problem and that the back of the gutter was not installed correctly.
When water drips between the fascia and the gutters the problem could be a compromised drip edge but it s also possible the gutters are overflowing.
1 your roof sheets have a hole in them or your screws or nails or equivalent are not watertight anymore or 2 the more common reason is where roof sheets are cut too short or they don t overhang far enough into the gutter.