Elevated type (suitable to any wooden floor,is aspecial constrution method)
Genarally,It don't suggest to use.It usually used in uneveness floor or special conditions.
The first layer is PVC moisture-proof cloth(overlapping 10-20CM,with moisture-proof function,may be placed under the board)
The second layer is anti-corrosion-angle material.
The third layer is 12mm board (the thickness must be at least 12mm,the nail can tight enough, and the ground can be flat enough)
The forth layer is wooden floor.
PS Elevated (strenghening styrofoam)
The ground must be flat so that to use this construction method.
Price: Generally elevated $6000 within 30CM/square
PS elevated $460/ 1CM /square