Roofing - valley tins

[beer batter]

Completely off the fishing topic.

We sustained storm damage in last fall's hail storm and had our roof replaced. The bid from a roofing company included valley tins on our roof but when it was completed there are no valley tins. Shingles are covering over all the valleys. The city inspector has already been out and it's all OK apparently.

Is this something I should be concerned about? What are the advantages to valley tins vs. shingle covered valleys?

[Surface Tension]

The valley flashing might be there. Theres a few ways to shingle a valley, all the those require the flashing and a membrane like ice & water shield. You can trim the shingles leaving a reveal of the valley or run the shingles long over the valley on one side then on the other side make your trim cut. I like the later better because it hides the flashing and looks more professional.

[beer batter]

Thanks Frank, that's probably what it is. All the other houses in our neighborhood getting their roof replaced still have the valley tin showing. I don't think anyone else used the same company as us however.

[18 inch Crappie]

They do it both ways, the tin is the old way and last the life of the roof, but now they use the shingles in the vally to make the roof look better. It is ok, but the draw back is the life of the shingles in that area because of the run off there is much greater then the rest of the roof, so they wear out faster in the vally.

[nitroant]

I have been seeing this on new homes the last few years. It must meet spec since everyone is doing it. To me it looks lazy, but I guess I am used to seeing the valleys. I would call the place that did it and ask about the valleys because it was noted on the quote. Make sure you got what you paid for. As far as anybody else who is doing a new roof, make sure you ask what your getting from each contractor you talk to and get the +/- to valleys and no valleys. The #1 thing you can do when scoping out a contractor who is going to do work is ask questions and get all the details in writing. If they say they are going to caulk when finished, make sure it is in writing.

[Surface Tension]

Maybe I wasn't clear. Which ever way the valley is finished off it still needs the flashing and membrane to make code. The blind valley takes more time to finish then one trimmed to reveal the flashing. Underneath the blind valley there is still the flashing and membrane. You see it more often because it looks better and thats what home owner wants. As far as the shingles wearing faster because of the extra water in the valley, I've never experienced that and I've roofed hundreds of roofs. I've often seen exposed valley flashing that was rusted out , yes galvanized flashing will rust.

[18 inch Crappie]

That is what I was told when I got my roof done a couple years ago. The extra water on that area will carry away more of the sand/rocks then on the flat surface, is what I was told. True or not, just detailing what I was told.