Roof Valley Leaking

Most shingle installers will use a thick 30 lb paper as a base for the valley.

Roof valley leaking.

The reason why the roof valley is such a sensitive area has to do with all the rainwater and or melting snow that accumulates and flows through the valley on its way into the gutters. Roof valley leaks valleys in your roof are locations where two roof planes intersect and form a v shaped valley that runs down a slope of your roof. Valley areas are prone to leak due to the lack of using proper materials. And if they put a second layer of shingles on they brought it up the valley but they didn t replace the valley it s probably leaking and cracking and split.

And you can tar it but it s a real stop gap band aid like measure. Often water runs to openings in the vapor barrier such as at ceiling light fixtures. In either situation the leaking roof valley can be fixed by removing affected shingles and structural elements and upgrading your roof s flashing. And damaged flashing is behind most roof leaks.

Valleys can be especially troublesome because they carry a lot of water during heavy rain. Roof valleys carry a lot of water. Some roof leaks are tough to locate. If your ceiling has a plastic vapor barrier between the drywall and the attic insulation push the insulation aside and look for flow stains on the plastic.

The right thing to do here is to pull a valley basically pull a valley apart and rebuild it. A roof valley is very prone to leaks especially if you have an older roof. A flashing is a transitional roofing material that connects the roof material to some other building material or to another part of the roof. Sometimes the water shows up at a ceiling spot distant from the leak.

Most roofers that do shingles will use a heavy base paper instead of a rubber membrane. They are common on both hip and gable roofs. Most roofers that install shingles will not have rubber membranes with them to do such areas.