The photo to the left shows a gutter with a inside miter at a roof valley.
Debris collects in gutter valley ends over straight run.
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.
It s the most common reason for overflowing gutters.
In this case there s a roof valley that ends over a straight gutter run.
If not a gap between the underside of the front edge of our gutter guard and the front lip of your gutter can cause rainwater to run over the gutter.
If step 1 does not apply then try step 2.
I do not recommend gutter covers if you have a low pitched roof and i don t recommend mesh gutter covers.
Fine debris can slip into your gutters.
A layer of needles at the bottom of your gutter is one of the toughest items to get rid of when you re cleaning your gutters.
And thankfully it s relatively easy to fix more on this topic below.
To sum it up gutter diverters can help with overflowing water in gutters only on inside or outside gutter corners.
Here s a quick video we created about a common problem area that a gutter guard has to deal with.
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.
Roof valleys are a common problem area for gutters and gutter guards.
This fine debris can slip into your gutters unnoticed and can accumulate there causing water to back up or gutters to warp and sag.
The problem with a splash or diverter being installed is that it stops debris from being washed or blown off the roof.