Valley Of Roof Leaking

The most common cause of a roof leak where metal flashings are used is shingles that have been improperly cut.

Valley of roof leaking.

If that water doesn t shed off the roof fast enough or gets under the roofing material roof leaks will soon develop. Valley areas are prone to leak due to the lack of using proper materials. Because roof valleys function as a drain on the roof they receive as disproportionate volume of water every time it rains. When a shingle from either roof intersects and passes over the metal valley flashing it needs to be cut at an angle.

Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary. Roof valleys if not installed correctly are one of the most leak prone areas on the roof. Most roofers that do shingles will use a heavy base paper instead of a rubber membrane. Clear any debris in the roof valley and surrounding area.

Most shingle installers will use a thick 30 lb paper as a base for the valley. Just like in nature a valley on a roof is designed to collect water. Many roof valley leaks are caused by roofing nails that have been poorly placed and are acting as a dripper feeding water through from the roof above. Follow these three preparatory steps to get ready to fix the valley leak.

Move to the highest end of the valley and work your way down cleaning. The resulting cut is very similar to the angle you might see on the tip of a wood chisel. 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.