Noise and vibration mitigating mat

A floor structure for a building structure comprising:

• a noise and vibration mitigating mat comprising:
• a first compressible, sound absorbing elastomer layer defining a contoured bottom surface of said mat, said bottom surface being formed with a plurality of protuberances extending therefrom to define peaks and valleys that are sequentially alternated, the depth and pitch of the peaks and valleys being configured to provide the mat with a desired dynamic compression characteristic under load;
• and
• a second layer disposed directly on said first layer and defining a generally flat top surface, wherein said first elastomer layer is non-vulcanized;
• and
• a concrete floor layer on said mat having an upper surface defining a floor surface, said mat attenuating energy to inhibit impact and/or vibration energy applied to said mat through said floor layer from propagating to surrounding structure.