Building material

A building material that is disposed between an inter-floor separation layer and a bottom layer disposed above the inter-floor separation layer, the inter-floor separation layer being configured to separate two neighboring floors from each other in a building, the building material comprising:

• a support member disposed between the inter-floor separation layer and the bottom layer, wherein the support member includes a top surface and a bottom surface, and at least a portion of the top surface contacts the bottom layer;
• a protruding portion protruding downwards from the bottom surface of the support member to have a height D, and extending in a direction along and parallel with the bottom surface of the support member;
• and
• a damping member disposed between the inter-floor separation layer and the support member, wherein the damping member includes a lower plate contacting the inter-floor separation layer, an upper plate contacting the bottom surface of the support member and a connecting portion connecting the upper plate and the lower plate to each other to allow the inter-floor separation layer to be spaced apart from the support member, and the damping member has a height H defined by the upper plate and the lower plate, the height H being larger than the height D.