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”?
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
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.
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.
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;-)
(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…
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.
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.