Noise insulation sandwich board

Sound-dampening sandwich plate for attachment to a structural component (40), having a first layer (12) and a second layer (22) connected to the first layer (12) over its surface area, characterized in that at least one planar fastening element (30) is provided at least in part, in particular along the second layer (22), which has on its side (34) facing the second layer (22) a plurality of engagement elements (38) that are capable of engaging with the second layer (22).