Shingles

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THE SHINGLES ARE MADE BY SENTINEL, 20YR WARRANTY.
THE PROBLEM IS ITS CURLING THEM OVER BACKWARDS.
WHEN TRY TO LAY THEM BACK DOWN, THEY CRACK ALONG THE TAB
I HAVE HAD A COUPLE COME LOSS. SO HOW DO I FIND OUT THE NAIL PATTERN FOR THESE SHINGLES