Abstract: A method of installing piping of a floor heating apparatus according to the present invention relates to a method of installing a floor heating apparatus in which pipes for circulating heat medium liquid are located on a floor base structure and they are covered with a flowable floor substrate material. After an adhesive is applied on a surface of the floor base structure, a tube assembly is positioned on said adhesive so that the lower face of a base plate of the tube assembly is bonded to said floor base structure by means of said adhesive, the tube assembly having a plurality of tubes made of an elastic material and said base plate made of the elastic material which integrally carries said tubes. A self-leveling material is poured and extended on the tube assembly. According to such a construction method, a number of floor heating pipes can be quickly and simply installed on a floor surface and a density of installation of floor heating pipes can be relatively readily increased.