Valley Of Roof Leaking

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

Valley of roof leaking.

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. Valley areas are prone to leak due to the lack of using proper materials. Move to the highest end of the valley and work your way down cleaning. Take measurements of your roof flashing most flashing is 14 inches wide but yours may vary.

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. When a shingle from either roof intersects and passes over the metal valley flashing it needs to be cut at an angle. Just like in nature a valley on a roof is designed to collect water. The most common cause of a roof leak where metal flashings are used is shingles that have been improperly cut.

The resulting cut is very similar to the angle you might see on the tip of a wood chisel. Roof valleys if not installed correctly are one of the most leak prone areas on the roof. Follow these three preparatory steps to get ready to fix the valley leak. Most roofers that install shingles will not have rubber membranes with them to do such areas.

Clear any debris in the roof valley and surrounding area. If that water doesn t shed off the roof fast enough or gets under the roofing material roof leaks will soon develop. Most roofers that do shingles will use a heavy base paper instead of a rubber membrane.