Roofing Problems Valleys

A roof valley is formed where two roof slopes meet.

Roofing problems valleys.

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. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. Signature exteriors lists three types of valleys and discusses their most common issues.

When leaks crop up around roof valleys the problem is often with the underlayment. 2 thermal expansion and incorrect sizing. 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. Water collects in a valley to flow off the roof.

Replace them with rubber washered screws. The roof covering material ends several inches short of the centerline of the valley. Common causes of roof valley leaks. Structural issues inadequate construction improper roofing methods and material deterioration.

These areas handle a large amount of water volume during a rainstorm. Valleys on between two slanted roofs causes leaks very often. 3 snow and standing. Essentially there are three main ways to shingle a roof valley.

Valleys are an area of the roof systems where 2 separate planes of the roof intersect. 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. It is critical that these areas be installed properly during the underlayment installation as well as the shingle installation. There are many factors that can contribute towards a failure of a roof valley flashing.

Repairing a valley area on a shingle roof. Weather and oxidization are the most common culprits for flashing deterioration but it is possible that flashing can just simply come loose. Missing ice water shield. Another major issue is thermal expansion.

We have been in the roofing business for 25 years. There s really no fix other than replacing the damaged vents. 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. Check for cracked housings on plastic roof vents and broken seams on metal ones.

You might be tempted to throw caulk at the problem but that solution won t last long. Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. In warm weather the valley. Woven closed cut and open.

Also look for pulled or missing nails at the base s bottom edge. The materials they use in valleys are inferior.