SONIC BAND 150 is applied around the perimeter of the room to be soundproofed in order to contain the underfloor concrete screed, thereby eliminating acoustic bridging that may occur between the screed/flooring and the wall separating the various rooms or living units. SONIC BAND 210 is uitable in all underfloor heating systems comprising insulation boards accommodating piping and an underfloor concrete screed. Again, when correctly installed, it eliminates any acoustic bridging which can occur in the event of the screed comes into direct contact with other rooms or living units.