[header] How to build a dance floor [title] Select plywood. [step] Plywood comes in several different types of wood and thicknesses. The type of wood does not matter too much. 
A ¾ in (2 cm) thickness is ideal, especially if you live in an apartment and there are folks who live beneath you. If noise is not an issue, ½ in (1.3 cm) thick plywood will work.