PreRoom means that a new bathroom built inside the old bathroom. Instead of tearing down old walls, floor and ceiling will it be left and new prefabricated walls, ceiling and pipes installed in the bathroom. On the floor is an air gap formation rug leveled and waterproofing and surface mounted. Thanks to PreRoom build an aerated structure that allows any moisture over time dries out through the existing residential ventilation. A bathroom does not take longer than 7 days to be new.