Now that I can easily add photos to this blog, I have added this one. See my prior post on the bad rap CertainTeed recieved. The problems here are poor workmanship. The nail pattern must be very specific so that two shingles, not just one, are penetrated by each nail.
"High Nails" as shown here are far less common when roofs are hand nailed.
Something you really can not see in the photo is overdriven nails which is also a big problem.
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