If step 1 does not apply then try step 2.
Debris collects in gutter valley ends over straight run.
The problem with a splash or diverter being installed is that it stops debris from being washed or blown off the roof.
Debris clogging up the gutter and or downspout flow leaves shingle granules sticks from broken tree limbs even plastic bags all of them frequently find their way into your gutters.
Roof valleys are a common problem area for gutters and gutter guards.
Fine debris can slip into your gutters.
Some of the worst debris for your gutters is the debris that s nearly invisible.
This fine debris can slip into your gutters unnoticed and can accumulate there causing water to back up or gutters to warp and sag.
And thankfully it s relatively easy to fix more on this topic below.
It s the most common reason for overflowing gutters.
In this case there s a roof valley that ends over a straight gutter run.
I recommend gutter covers if you have a steep pitched roof and you get a water flow gutter covers.
Look on top of the mesh and see if there is any debris on it generally the first cause of rainwater coming over the gutter is because there is a lot of debris on the mesh.
I do not recommend gutter covers if you have a low pitched roof and i don t recommend mesh gutter covers.
Here s a quick video we created about a common problem area that a gutter guard has to deal with.
The photo to the left shows a gutter with a inside miter at a roof valley.
To sum it up gutter diverters can help with overflowing water in gutters only on inside or outside gutter corners.