Roofing Problems Valleys

A lining made of metal protects the valley from moisture intrusion.

Roofing problems valleys.

4 common problems with roof valleys 1 worn underlayment. 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. Common causes of roof valley leaks. We may not know how to spell but roofing we know best.

We have been in the roofing business for 25 years. Weather and oxidization are the most common culprits for flashing deterioration but it is possible that flashing can just simply come loose. 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. Essentially there are three main ways to shingle a roof valley.

Woven closed cut and open. 3 snow and standing. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

Check for cracked housings on plastic roof vents and broken seams on metal ones. The materials they use in valleys are inferior. Missing ice water shield. In warm weather the valley.

Closed valleys may have a tendency if not constructed properly to channel water under the shingles laid over the bottom layer of shingles. There s really no fix other than replacing the damaged vents. Valleys are an area of the roof systems where 2 separate planes of the roof intersect. These areas handle a large amount of water volume during a rainstorm.

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. Another major issue is thermal expansion. There are many factors that can contribute towards a failure of a roof valley flashing. Structural issues inadequate construction improper roofing methods and material deterioration.

Replace them with rubber washered screws. 2 thermal expansion and incorrect sizing. Signature exteriors lists three types of valleys and discusses their most common issues. Most roofers know how to install shingles but many have no clue how to do a valley.

The roof covering material ends several inches short of the centerline of the valley. When leaks crop up around roof valleys the problem is often with the underlayment. Valleys on between two slanted roofs causes leaks very often. It is critical that these areas be installed properly during the underlayment installation as well as the shingle installation.

Also look for pulled or missing nails at the base s bottom edge. Repairing a valley area on a shingle roof.