Many houses in the usa have complex roof structures that create valleys.
Roof valley water runoff.
Use wider 6 gutters.
Roof valley rain diverter has been designed to fit most roof valleys they prevent the runoff water from overshooting the rainhandlers.
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.
I d also add gutters to the upper roof line that dumps onto that portion of the roof that is a problem area.
The diverter solves this problem by collecting and redistributing water to the gutter system.
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.
Choose brown for a dark colored roof and natural aluminum for a light colored roof.
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.
The valleys on many older houses comprise layers of roofing paper which can deteriorate over time.
This will help control water flow.