We 'laid' subflooring (only used 1/2" OSB to reduce weight) screwed to the ceiling joists, just as you'd do for regular floor application into floor joists. The planks were attached with a nail gun using 1 1/4" nails shot thru the very front edge of the tongue. They were angled at about 45 degrees as the ceiling also slopes in there from 10 ft down to 6 ft. We used 4 nails per plank.
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