All underfloor insulation acts to deaden sound moving through the air as soundwaves are interrupted by the structure of the insulation material.
Palace Planks Premium range however also deaden sounds that would otherwise resonate through the timber structure of the floor. Because the rigid nature of polystyrene and the unique thickness of Palace Planks Premium, secured tightly the friction fit creates pressure along the entire length of the joist stiffening the timbers and reducing resonance through YOUR timber floor.
And if other types of noise annoys, then Poly Palace does not come courtesy of advertisements for the EECA Energy Spot proclaiming "you have the power to choose". Choosing between government underfloor insulation products that are all minimum standard is no choice at all.