B. Expansion by installing the balance plate: some add a layer of rough floor on the keel, some require a gap of 0.2mm wide between the plates, some require water traps at the four corners of the room to release moisture conveniently, some require the expansion joints of the wall floor to have springs, some adopt aluminum alloy keel, and some adopt rail-type wooden floor installation.
C. Moisture-proof treatment methods of plates: back plate tongue-and-groove coating, wax coating, aluminum platinum coating, nano-plastic coating, etc.