Closed Valleys


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Old 01-01-09, 07:58 AM
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Closed Valleys

Can you desribe a closed valley? How is it constructed? Thank you.
 
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Old 01-01-09, 08:27 AM
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The place to start for comp shingle questions is the Master Shingle Applicator's Manual:

3 tab shingles, closed valley is on pp 118

Laminated shingles, closed valley is on pp 150

Those are "closed-cut valleys", it's also possible to do "woven-valleys"



The alternative to a closed valley is an "open-valley", in this case the shingles are cut to both sides of the center of the valley and rest on roll roofing or metal flashing laid in the center of the valley.

 

Last edited by Michael Thomas; 01-01-09 at 09:06 AM.
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Old 01-01-09, 08:34 PM
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The picture of the open valley shows the wrong ay to cut the shingles. Interesting. It should show those tops being cut off paralell to the rafters.
 
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Old 01-01-09, 09:03 PM
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Originally Posted by tinner666
The picture of the open valley shows the wrong ay to cut the shingles. Interesting. It should show those tops being cut off parallel to the rafters.
Do you have a link to an illustration which shows this?

- Thanks
 
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Old 01-03-09, 07:34 AM
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Go down to 'Valley Details'

Photo Album Account Logon
 
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Old 01-03-09, 07:39 AM
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If you also cruise to 'Water Tracks', you'll find a 40 year old valley done that way for 2 different roof that never leaked. It's only 12" metal and ice dams apparently never caused it any issues either. On yeah. It never had any underlay under it either.
 
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Old 01-03-09, 07:47 AM
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Interesting. In this thread, http://forum.doityourself.com/roofin...-addition.html, they have an illustration showing how to cut the shingles at a 'reverse 45 angle'. I've had to repair those too. The angle will direct water under the shingles in heavier rains much like not clipping at all.
 
 

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