What is a W Valley?  On our roofs that we install they all have what we call a W valley, the reason this is so important is that the traditional valleys can leak.  A W valley will not leak, in fact on over 500 metal roofs installed with W Valleys we have never have one leak, however on less roofs installed with a normal Valley, we have had many of those leak.  We know better than most that normal valleys will leak.  The picture above is a normal Metal Roofing W Valley, and the picture below is a traditional metal roofing valley.  Take a look at the video I did showing samples of both and how the metal roofing fits panels fit into the valleys and the potential leaks that will occur on the normal metal roofing valley.

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Here is the link to the video that I did with the W Valley