The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
Roof valley water runoff.
I d also add gutters to the upper roof line that dumps onto that portion of the roof that is a problem area.
Roof leak diverter by new pig catch and divert roof leaks mildew resistant and reusable easily stores away for later use 2 5 x 2 5 tls552 cl.
Earthminded flexifit diverter upgrade for 3 x 4 inch rectangular downspouts for new or existing installations easy to install catch rain water for outdoor chores.
Many houses in the usa have complex roof structures that create valleys.
Drip edge metal valley flashing dormer chimney and kickout flashing are types of roof flashing that shed water away from the connections between roofs walls chimneys and other building assemblies.
Use wider 6 gutters.
This will help control water flow.
Roof valley rain diverter has been designed to fit most roof valleys they prevent the runoff water from overshooting the rainhandlers.
While this is a normal aspect of roofing and gutters water that pours off of a roof and drenches an area like a door stoop or porch not only makes these spots slippery but water falling.
Roof valleys are troughs that discard runoff water where two sections of sloped roof meet.