20x1.5 loft flooring

[rickeyleee]

Looking now at putting t1-11 for loft floor facing down and then putting wood flooring on top of it which would give me
1 1/8" floors on 24" OC floor beams.  My loft area is 18' with a small BR, bath, and laundry room below with the hall separating the bedroom from the bath and laundry.

Anyone have any ideas how I can finish off the few perpendicular seams of the 4x8 sheets of T1-11 that will show up in the rooms below? 

[ChugiakTinkerer]

If it's going to be open to the bedroom below, I would really want to see a mockup with the T1-11.  Didn't you originally plan on T&G 2x6?  That seems like a much more preferable solution for exposed wood on permanent display.