Any suggestions on filling gaps in wood flooring? Pine tongue groove was used that is usually used for wall or ceiling. Have no idea why they put this on the floor? I was thinking cutting wood strips and gluing them in then sand. Better idea may be to rip it up and put a real floor down. Impossible to clean for the owner.
You cannot fill these gaps in. Any wood floor needs to expand and contract across its width and the tongue and groove profile of the individual strips allow the floor to absorb changes in width without buckling. All wood floors will have a similar approach for the same reason. I will grant you that pine makes for a floor that is very susceptible to scratches and dents, and the exposed screw is singularly unattractive! If you want invisible seams consider a plastic laminate flooring in a wood pattern.