Seems like perpendicular is the way to go, judging by the responses. I actually have a subfloor on top of joists on top of a slab. The main hallway of the house has hardwoods running north-south, the bedroom hallway runs east-west so if I wooded that hall, I would have a 90 degree junction.

I was thinking of using tongue and groove mesquite boards (only need 1/2" thickness) and predrilling for screws through the tongues, instead of nails. I am in no hurry.....

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