This is where two parts of the roof join.
Roof gully repair.
Soup to nuts riley shows the proper way of installing a valley on a roof.
I had roofers in who cleaned repaired and sealed my roof and gave me a guarantee for 10 years but the leak comes back every so often in heavy rain.
If you have multiple valleys on your home you may have to consider a complete re roofing job especially if your roof is rather old and will need to be replaced soon.
Begin by removing the shingles down to the wood sheathing and slip a strip of adhesive ice and water barrier available where roofing repair products are sold under the soffit main roof joint.
To each other which seems to be lead has a persistent leak.
This video shows the full repair from removing leaded va.
This video shows the traditional and best way to repair a lead valley on a roof.
This method of lead valley repair is proven to not only be fast and safe wit.
Depending on how the roofs join you may have to cut a slot to work it in far enough.
Aging shingles in a roof valley areas can create fissures and cracks that permit moisture to pass through.
If you have a roof leak it may well be through the valley.
Soup to nuts riley shows the proper way of installing a valley on a roof.