I am making plans to shingle my house. It currently has one layer so I'm planning to shingle over the current layer rather than remove it. I have a couple questions: 1. What do you use to cut the shingles. I can't imagine what would stay sharp after two or three shingles. 2. Do I need to lay down a layer of felt or can I put the shingles directly on the current layer? Any other tips and tricks you might suggest would be appreciated. Ralph
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