Marc Posted May 2, 2020 Report Share Posted May 2, 2020 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 Quote Link to comment Share on other sites More sharing options...
Mike Lamb Posted May 2, 2020 Report Share Posted May 2, 2020 I assume it's to push water towards the valley. Quote Link to comment Share on other sites More sharing options...
Erby Posted May 2, 2020 Report Share Posted May 2, 2020 Watch this. Your question is answered at about 3:34. Quote Link to comment Share on other sites More sharing options...
John Kogel Posted May 2, 2020 Report Share Posted May 2, 2020 It stops water streaming down the valley from running along the top of a shingle strip. Good luck with that. If I was closer I'd stop by to lend a hand.😷 Quote Link to comment Share on other sites More sharing options...
Marc Posted May 2, 2020 Author Report Share Posted May 2, 2020 (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 May 2, 2020 by Marc Quote Link to comment Share on other sites More sharing options...
Chad Fabry Posted May 8, 2020 Report Share Posted May 8, 2020 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. Quote Link to comment Share on other sites More sharing options...
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