I'm having roof valley problems with a 15 year old house that I bought
last summer. There was little rain in Western Colorado since I bought
the house, but this winter leaks showed up in about half of the nine
roof valleys from melting snow. The current valleys have metal "W"
flashing of the open valley type construction, except that the shingles
are butted right up against the center ridge leaving no open channel.
Most of the roof is fairly high pitch. I am told that I don't need a new
roof, but in the one repair job I had to have done this winter on a
low-pitched add-on, there were quite a few torn shingles along the
boundary where the old shingles were lifted to slip the new ones under.
I'm not sure if this was due to carelessness or the cold weather, or
this is just standard for a repair job. I am now trying to decide if
should tear out and repair the remaining valleys only or have the entire
I have received conflicting advice about whether open or closed valleys
are better. I am somewhat reluctant to put back the same type of valley
that is currently leaking in so many places unless there is clear
evidence that open valleys are better. Generally the rest of the house
has high-quality materials and construction, so I would have thought
that the roofing job would have been the same -- but perhaps not.
You might check to see if the "ears" were cut off of the valley shingles at
installation. Meaning the top of the shingle, it's where the shingle would be
"pointed" if the valley cuts were not properly made, allowing water to be
conducted sideways, literally. Carefully lift a shingle in the valley, and if
the underlying shingle comes to a point in the valley, cut off the point using
a hook knife, being careful not to damage the metal. I prefer a "one-cut"
valley, where the face that recieves the least water (or is of lower pitch), is
wrapped up under the opposing face, and the opposing face recieves the valley
> Richard wrote:
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