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Roof Valley Flashing – Common problem that causes leaks

We have been in the roofing business over 25 years. We may not know how to spell, but roofing we know best.

Most roofers know how to install shingles but many have no clue how to do a valley. The materials they use in valleys are inferior. We use rubber roof membranes. Because of our experience in flat roofs we use better materials and techniques.

In the following pictures, we show the process of fixing a valley area. When a valley is flat like this one in the picture, it is more problematic. Water like to follow the valley to the edge and flow back under the valley.

Valley areas are prone to leak due to the lack of using proper materials. Most roofers that do shingles will use a heavy base paper instead of a rubber membrane.

Valley areas are prone to leak due to the lack of using proper materials

Most shingle installers will use a thick 30 lb paper as a base for the valley. Most roofers that install shingles will not have rubber membranes with them to do such areas. Rubber membranes are considered for flat roofs only.

When people have to get on a roof to do some kind of work like installing cables or antennas, they will very likely walk in the valley. That’s when a valley gets damaged.

When two panels meet to form a valley, care must be taken to secure the area with material that can support a person weight when stepped on.

When two panels meet to form a valley, care must be taken to secure the area

Some areas were not covered and birds made nests. Just not good for the roof.

The best path on the steep roof to the top is the valley area. Workers will use that to move around the roof therefor it must have stronger material than the rest of the roof.

When workers walk on a roof they always find the easiest way up or area to secure themselves. A valley is a perfect place for that.

When workers walk on a roof they always find the easiest way up or area to secure themselves

We had to remove shingles to make way for a wide rubber roof membrane. This prevents leaks when ice builds up. Has to be high enough to stop water pouring in.

Modified Bitumen Membrane is the best rubber to use for a roof valley. The rubber membrane is tough enough to hold the weight of a person.

Modified Bitumen Membrane is the best rubber to use for a roof valley.

A metal flashing was installed to give the rubber a support for when people walk on the roof this will be the place where they step. A metal lining under the membrane secures that the valley will never puncture again.

A metal lining under the membrane secures that the valley will never puncture again.

The small areas are always difficult to work on and are always a place to rest also when working on a roof. Whenever people have to walk on a steep shingle roof, they will always look for the valley area. That is the easiest way up and down a steep roof.

Whenever people have to walk on a steep shingle roof, they will always look for the valley area.

So a metal liner was installed to support the rubber membrane. Roof repairs are time-consuming, The best is to do right from the start.

Roof repairs are time consuming, The best is to do right from the start.

We found a rubber membrane that matched the color of the shingles. Making a roof repair you need the proper material for every repair.

Making a roof repair you need the proper material for every repair.

The valley was finally done and well repaired. Repairing a roof leak takes experience. If the installer had experience then this roof repair would not have been necessary. The end result is everything blends in and no one can tell a repair was done.

The end result is everything blends in and no one can tell a repair was done.

The roof repair was so well done that you could hardly see what was done. Although nobody will see this roof repair up high on a roof, we still take pride in doing an excellent job.

Although nobody will see this roof repair up high on a roof.