Pre-formed bituminous accessory elements to be integrated in the installation of plastic supports used in the construction of floating pavement. The range consists of 4 items: - PB RING diam. 20 cm. thickness 6 mm - PB SQUARE 30 x 30 cm. thickness 6 mm - EVO RING diam. 20 cm. thickness 5 mm - EVO SQUARE 30 x 30 cm. thickness 5 mm. The PB versions have an excellent mechanical resistance and improve the static puncturing resistance, caused by the weight of the floating pavement. The EVO versions have a dimpled lower face which reduces the surface of contact of the pavement with the waterproofing and significantly reduces the impact noise, further facilitating the run off rainwater to the drains.