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Clip upper corner???

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I'm in the process of replacing my roof cover.  The Atlas Pristine instructions for closed cut valleys say to 'cut the upper corner' of the overlaying shingles.  The diagram isn't clear.

I've heard that before but I'm not clear on it.  Anyone know what they mean by 'cut upper corner'? Why is it needed?

Thanks, Marc

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Posted (edited)

Thanks fellas. I guess a good way to describe it is to not allow the top edge of the shingle to reach the valley. Cut it two inches back with a vertical cut.

Edited by Marc
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I didn't know to cut the top corner when I did my first roof ever. It leaked during wind driven rains. The factory rep schooled me. I find and report it on about 80% of the roofs I inspect with closed cut valleys.


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