replacing roof shingles?

Only if you are doing the first row. If you are just replacing individual shingles, you need a wonder bar to reach up and loosen the nails. If you are talking about a roof over, no you do not need to start with upside down. That would yield 4 layers at the bottom and look funny.

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I had Shingles for the first time a few weeks ago. I am normally in good health and haven't had any other health challenges before, so it came as a surprise.

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My wife found the Fast Shingles Cure ebook online and bought it for me, I am very lucky to have such a wonderful woman in my life. We followed the book, did what it said, and it delivered what it promised. Finally my Shingles rash is over... I feel truly blessed and thankful.

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YES, The first row ALLWAYS needs to be upside down. Good Luck.

Yes, do it just like you are doing a new roof.

I wouldn't change anything the second time around.