Roof vents come in a variety of styles. Another cause of leaks in valleys is water running between the shingles and the valley flashing system. Lead is used extensively on roofs due mainly to its durability. This speeding water can hit your valley and run up under your shingles. While we might be warm and comfortable inside the house, the condition of the roof outside might not be sufficient to hold back storms.
The opinions expressed in reader comments are those of the author only, and do not reflect the opinions of The Seattle Times. They allow air circulation under your roof and allow air inside your attic to circulate with the air outside your attic. And on occasion a hard driving rain with whipping wind will cause roof vents to leak water.
On a side note we recommend and prefer a closed valley where shingles are run from one slope up onto the other slope then overlapped by the shingles from the adjacent slope for a water tight valley. There are many different types of valley leaks. Step flashing soaker, base flashing - Consists of pieces of flashing material, in this example lead, which overlaps each other in "steps". Especially the slow ones.
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