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Can you "weave" a new floor into an exhisting one thus eliminating the perpendicular board in the middle of the room?
Yes, it can be done and I do it all the time. However, some types of wood floors make this quite difficult. If your existing floor is a factory finished engineered floor glued to concrete, that's the more difficult kind to lace into. Plus, your old floor may not be made anymore and the T&G profile of a new floor may not fit the old one. Another issue is that the existing floor may have too thin of a top veneer to sand, making a color match quite difficult as well. The best type of floors for lacing into are solid wood floors that can be refinished. Also, floating floors are not real good candidates for lacing into. It really depends on what you have now. Have a local, experienced wood floor professional take a look and give you some options.