Why Is Water Getting Behind My Gutters?
Water behind a gutter can come from more than one condition. The key is determining where the water starts.
By Everyday Home Advice Editorial Team

Water behind a gutter can come from more than one condition. The key is determining where the water starts.
Is the gutter overflowing?
A clogged or undersized drainage path can cause water to spill where it shouldn't.
Is water coming from the roof edge?
The way roof-edge components and gutters interact matters.
Is the gutter pulling away?
A loose gutter may create gaps that allow water to move behind it.
Why does it matter?
Water repeatedly running where it shouldn't can affect fascia, soffit, siding, and areas near the foundation.
Don't work from an unsafe ladder
If inspection or repair requires unsafe ladder or roof access, use professional help.