A couple of days ago we put up the interior load bearing wall. Today, we finished putting up joists and blocking, and we are now ready to start putting down the flooring. For the second floor floor I decided to go with tongue and groove 2×6 spruce boards on a diagonal. The boards will be more time-consuming install and costly than a sheet good like OSB or plywood, but it means we won’t need to put down a hard wood floor at $3-5/S.F. Also, sheet goods, especially OSB, has a lot of glue in it, which I would like to avoid putting in our living space.