If you are stripping the roof entirely right down to the sheathing consider adding some foamboard insulation under the new metal roof. All that you need to do is use 2x4s laid flat in landscape orientation and spaced two feet apart and then place 2' x 8' x1.5" foam boards in between. Relatively inexpensive and easy to do and it makes a BIG difference in both insulation and sound. It will also tie the rafters together and should make for a stronger roof with very little additional weight gain.
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