Your 1X decking should be inspected for rot, cracking, etc. The smoother
it is, the smoother your shingles will lay. If the boards are in good
shape, then new underlaymnet and shingles are all you need.
If the overall condition of the planks are bad. it might be easier to rip
them off and replace them.
About the time I had mastered getting the toothpaste back in the tube, then
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