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You should be using 1/2" roof sheathing not 3/8. 1/2" OSB is as good as you will need. If your trusses or rafters are 24" on center then you must use "sheathing clips"...."h" clips in between each truss/rafter space. Standard 16" on center trusses or rafters do not require "h" clips. The clips are not for expansion so much as they are for keeping the two sheets together at the same level over a 24" space.
Very few companies will lift anything to a roof because of liability reasons.
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