Metal Roof Leaks In Valley

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.

Metal roof leaks in valley.

Most roofers that install shingles will not have rubber membranes with them to do such areas. Roof nail leaks can happen when roof nails have been loosened slightly from high. Most shingle installers will use a thick 30 lb paper as a base for the valley. Metal roofing screws more often than not if you have a leak in your metal roof a metal roofing screw is the culprit.

The most common cause of a roof leak where metal flashings are used is shingles that have been improperly cut. How to fix roof valley leaks. When installed properly metal roofing screws will seal out the water by compressing a rubber washer down at the base of the screw head. You will find that most metal shingles roofs require a minimum slope of 4 12 or four inches of rise for every 12 inches of roof run.

The resulting cut is very similar to the angle you might see on the tip of a wood chisel. Remove debris remove all debris from roof valleys so nothing is touching your roof. A roof valley is very prone to leaks especially if you have an older roof. First and foremost make sure that a roof has a sufficient slope for a metal roofing system that has developed a leak.

Re shingle roof valleys install ice and water shield under shingles or install metal roof flashing and re shingle the valley. When a shingle from either roof intersects and passes over the metal valley flashing it needs to be cut at an angle. Often times the original roofer who installed the roofing system failed to include a leak barrier in the valley such as gaf weather watch or valley metal.