Roofing Problems Valleys

A roof valley is formed where two roof slopes meet.

Roofing problems valleys.

It is critical that these areas be installed properly during the underlayment installation as well as the shingle installation. The material is usually aluminum or galvanized steel and depending on the type of roof you have is most likely in the valleys around the chimney and even around dormer windows or skylights. Signature exteriors lists three types of valleys and discusses their most common issues. Essentially there are three main ways to shingle a roof valley.

Repairing a valley area on a shingle roof. 4 common problems with roof valleys 1 worn underlayment. Structural issues inadequate construction improper roofing methods and material deterioration. Also look for pulled or missing nails at the base s bottom edge.

There are many factors that can contribute towards a failure of a roof valley flashing. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. Most roofers know how to install shingles but many have no clue how to do a valley. 2 thermal expansion and incorrect sizing.

There s really no fix other than replacing the damaged vents. Another major issue is thermal expansion. Valleys on between two slanted roofs causes leaks very often. Check for cracked housings on plastic roof vents and broken seams on metal ones.

3 snow and standing. Weather and oxidization are the most common culprits for flashing deterioration but it is possible that flashing can just simply come loose. Water collects in a valley to flow off the roof. You may encounter defective valley lined shingles installation failed roll roofing valley liners or a cross wash where water running down a roof slope flows across the valley and up beneath the shingles on the adjacent slope.

Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. Common causes of roof valley leaks. When leaks crop up around roof valleys the problem is often with the underlayment. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

Woven closed cut and open. In warm weather the valley. However open valleys may be susceptible to water back up along the top of the cut off shingles in the valley if not properly trimmed potentially causing roof leaks. Replace them with rubber washered screws.

We have been in the roofing business for 25 years. You might be tempted to throw caulk at the problem but that solution won t last long. These areas handle a large amount of water volume during a rainstorm. The materials they use in valleys are inferior.

A lining made of metal protects the valley from moisture intrusion. Missing ice water shield.