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Re: OSB on top of cedar shake roof
What everyone else said regarding OSB over the existing shakes...
The only thing is that I keep seeing "down to the rafters" for the tear off. Around here it is usual to leave the original one-by skip sheathing in place, and then install the OSB or plywood over that (our "better" roofers seem to prefer plywood). The weight of the one-by's is negligable and I think it actually makes for a stronger decking. It's by far the norm around here for any home 1900-1980's that originally had a wood shake or wood shingle roof. See photo.
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