[unclebilly]

Originally Posted by Tobra

Cut the shingles up with a hook blade

This. A hook knife.

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I did the circular saw blade thing once, I was wearing safety glasses and still got glass and grit in my eye… an hour on irrigation at the hospital was the only real accomplishment. I switched to a hook blade and finished the job. The next roofing job, I learned to cut the shingles to length as I installed them.