A composite membrane of wood floor diaphragm for construction of new buildings and strengthening of existing buildings to provide improved load transfer capacity and enhanced resistance to gravity and lateral loads, such as earthquake and/or wind for buildings with wood floor framing. The aforementioned composite membrane is a system, comprised of four-way interlocking mosaic end grain parquet floor attached to a plywood subfloor beneath. A floor to floor sound blocking barrier that can operate in high eighty decibel and above range may preferably be installed under the subfloor.