Open and Closed Valley


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Old 11-20-06, 02:56 PM
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Open and Closed Valley

Am getting ready to replace roof. Present roof is composite over old wood shingles. Have to pull up shingles and put down sheathing over entire roof. Have metal valleys at present, but believe most have recommended going to closed valleys. Does anyone have pictures of a properly installed closed valley, and can you explain how to do it best? Have heard that tips of shingles need to be cut, and that shingles must completely cover the water flow area. Hard for me to visualize this. Any help appreciated. Thanks.
 
  #2  
Old 12-02-06, 01:27 AM
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Open valley works better. Acts as a gutter with debris on the roof. Gets washed off during rain. Closed valley just gives the debris traction to stay on the roof during the rain.
 
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Old 12-03-06, 04:10 PM
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While I agree with the above post to some extent - I prefer closed valley for the aesthetics - especially a woven closed valley. I'm an experienced DIY roofer (3 under my belt to date), but not a professional - so will wait to see if you get a "pro's answer" to the methodology before I pass on my personal "how to" advice. PM me if you get no responses in a reasonable amount of time.
 
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Old 12-04-06, 06:38 AM
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Thanks for comments. Hopefully some of the pros will chime in on this. Will get back to you Thezster after hearing more.
 
 

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