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Joe Jenkins
Senior Member
Username: Joe

Post Number: 90
Registered: 07-2006
Posted on Saturday, April 21, 2007 - 11:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

The "W" valley (inverted "V" groove) breaks the hydrostatic pressure as water drains from the steeper slope onto the less steep slope and forces the water to run down the valley rather than onto the less steep slope. That's why it's used when you have two asymmetrical roof slopes, or a large slope draining onto a small one.
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jason winfrey
Junior Member
Username: 1roofpro

Post Number: 14
Registered: 09-2006
Posted on Friday, April 20, 2007 - 08:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

the w valley isnt really restoration correct,but it is what i would use in your situation. the benefits far outweigh the looks & only a roofer will probably notice the differance
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Mark Dullea
New member
Username: Sammy

Post Number: 1
Registered: 04-2007
Posted on Friday, April 20, 2007 - 09:41 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only) Ban Poster IP (Moderator/Admin only)

I am working on a project with a two pitches. The top of the roof is 20:12 and it transitions to a 10:12 roof. We are using 20oz. copper in the open valleys and want to know the pros and cons of using a 'V' vs. 'W' shape valley flashing. Everything I have read leads me toward using the 'W' shape profile.

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