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  #1  
Old 6/1/18, 6:38 PM
Jeffrey S. Campbell's Avatar
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Default Cut Valleys

Fellow NACHI Inspectors...

What is the consensus on cut valleys in regard wo which roof plane shingle goes on top (and is cut)? If the lower roof, like a dormer, is steeper pitch than the upper main roof. I've read the upper roof goes on top (more water shed) and read the steeper roof goes on top. If the ridge lines are equal, I'd go with the steeper option I get that...

What is everyone's "cut-feeling"?

Thanks
Jeff


In the attached photo, both pitches are the same and while I wrote up the main roof should overlap the lower in the cut valley, I didn't make a huge deal of it and now the seller called the contractor who is PISSED... LOL
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  #2  
Old 6/1/18, 6:43 PM
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Default Re: Cut Valleys

California valley..Fine.




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  #3  
Old 6/1/18, 7:08 PM
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Default Re: Cut Valleys

The larger or the steeper roof plane gets the cut. If those are the same slope, they did it wrong.



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  #4  
Old 6/1/18, 7:17 PM
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Jeffrey S. Campbell Jeffrey S. Campbell is offline
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Default Re: Cut Valleys

Quote:
Originally Posted by btoye View Post
The larger or the steeper roof plane gets the cut. If those are the same slope, they did it wrong.
Brad, that is my understanding as well. (yes same pitch)

which takes precedence Steep vs. Higher? for example if this lower/smaller roof was a steeper pitch?



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  #5  
Old 6/1/18, 8:23 PM
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Default Re: Cut Valleys

Quote:
Originally Posted by jcampbell View Post
Brad, that is my understanding as well. (yes same pitch)

which takes precedence Steep vs. Higher? for example if this lower/smaller roof was a steeper pitch?
The steeper plane gets the cut, even if lower. If that dormer had a steeper slope, then it would be correct. You always want the least amount of water runoff or force against the edge of the cut. It wouldn't matter on a weave or a metal open valley.



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  #6  
Old 6/1/18, 8:59 PM
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Default Re: Cut Valleys

Quote:
Originally Posted by rlewis5 View Post
California valley..Fine.
How come you know all this stuff
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  #7  
Old 6/1/18, 9:43 PM
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Default Re: Cut Valleys

Larger plane with the greater volume of water overlaps the smaller (per Certainteed). Those are so similar that I wouldn't have commented. Cut line should be 2 inches above the center line so that it's less prone to trapping debris. You could argue that you're correct, but IMO its moot on this roof.



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  #8  
Old 6/1/18, 10:15 PM
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Default Re: Cut Valleys

Its fine and dandy to inform your client that the shingles were installed wrong but lets be honest and Realistic here do you really expect the seller to tear off and reinstall????? I see wrong cuts quite frequently and nothing is ever done about them. BTW we call them Texas cuts



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  #9  
Old 6/3/18, 9:46 AM
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Default Re: Cut Valleys

(Chuck Evans) I noted it in the report that I was technically wrong but may not be a problem moving forward. I suggested they keep an eye on it and since the back roof needed to be reroofed anyway, that would be a good time to review it again (i.e. monitor conditions). I told them I don't believe it's worth changing. but since the roofer was called out to fix the deteriorated rear roof, somehow he got wind of this comment and made a fuss. All is good...



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Last edited by jcampbell; 6/3/18 at 9:52 AM.. Reason: was a reply to Chuck Evans
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  #10  
Old 6/3/18, 9:51 AM
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Default Re: Cut Valleys

Quote:
Originally Posted by cbottger View Post
Its fine and dandy to inform your client that the shingles were installed wrong but lets be honest and Realistic here do you really expect the seller to tear off and reinstall????? I see wrong cuts quite frequently and nothing is ever done about them. BTW we call them Texas cuts
my question was a technical question on what is correct. I am sorry if you misunderstood my question. I did not tell anyone to tear off and reinstall... in fact I told them while technically wrong, it was likely fine, just to keep an eye on it... of course this was the day after we saw this other one... so we were sensitive to the problem.
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Cut Valleys-20180523_093940-jpg   Cut Valleys-20180523_094111-jpg  



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  #11  
Old 6/3/18, 10:39 AM
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Default Re: Cut Valleys

Quote:
Originally Posted by cbottger View Post
Its fine and dandy to inform your client that the shingles were installed wrong but lets be honest and Realistic here do you really expect the seller to tear off and reinstall????? I see wrong cuts quite frequently and nothing is ever done about them. BTW we call them Texas cuts
OKie Doke!



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  #12  
Old 6/3/18, 2:39 PM
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Default Re: Cut Valleys

The cut goes on the side spelled out in the manufacturer's installation instructions.



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  #13  
Old 6/7/18, 11:45 PM
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Default Re: Cut Valleys

Yes, that's a California cut valley. You can see the pattern in the shingles that lie parallel with the valley.

On a cut roof it gets cut back on the side with the greatest volume or velocity runoff.

Just like if it's an ugly, crooked cut, if it's cut back on the wrong side, that's a sign to look for other problems on the roof, because you shouldn't call for correction of that small a problem, because they're not going to do it and you'll just create bad feeling.

You could check to see if it's sealed along the cut against cross-wash.



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