In other cases water can become trapped under shingles which have been overlaid to create the valley trough.
Fixing leaking roof valley.
This method of lead valley repair is proven to not only be fast and safe wit.
Roof valleys are channels designed to drain runoff water and like any other part of your roof they can degrade over time with exposure to the elements.
Roof valleys carry a lot of water.
If you re not sure what a roof valley looks like check out the photos on this page.
Roof valleys are prone to leaking and are a well known weak spot on older roofs.
Although professional roofers take great care to properly install roof valleys they can be susceptible to roof leaks.
Though roof valleys are com mon leak sites on shingle roofs it s typically fairly easy to fix these problems with a little know how.
The valley flashing laid over the joint where the two roofs meet should overlap the step flashing at least 2 in.
Roof valleys are created wherever two roof surfaces intersect to form a shallow v shape.
Find them locally at hardware stores or home centers improved attic insulation and ventilation are usually the best ways to prevent ice dams.
This video shows the traditional and best way to repair a lead valley on a roof.
How much it costs to repair or replace a roof valley will depend on what it s made from.
If your roof valley leak is an old repair gone bad consider having a professional repair the leak properly.
If leaks continue to occur from ice dams consider installing roof edge heating cables.
If you find that this is a problem then you will need to repair your roof valley before anything serious happens such as plaster loss or even major water damage.