A thought, when laying end tongue and groove as flooring, can you let the joints lie between the floor joists? If not, then you must cut down the tongue and groove board to the nearest joist, right? :what:
Yes, end-jointed floorboards can be joined between joists. However, you must ensure that there are no joints on floorboards that are right next to each other in the same joist "compartment." That is, there must be at least one joist between two joints on adjacent floorboards.