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Provided is a building material that is disposed between an inter-floor separation layer configured to separate floors of a building having a plurality of floors from each other and a bottom layer disposed above the inter-floor separation layer. The building material includes a support member dispos

Provided is a building material that is disposed between an inter-floor separation layer configured to separate floors of a building having a plurality of floors from each other and a bottom layer disposed above the inter-floor separation layer. The building material includes a support member disposed between the inter-floor separation layer and the bottom layer, having a top surface of which at least a portion contacts the bottom layer, and including a protruding portion protruding downward, extending in at least one direction, and having an inner space and a plurality of damping members disposed between the inter-floor separation layer and the support member and each of which has a lower plate contacting a portion of the inter-floor separation layer and an upper plate contacting a portion of the support member to allow the inter-floor separation layer to be spaced apart from the support member.

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1. 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

1. 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; anda 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. 2. The building material of claim 1, further comprising: a buffer panel disposed on the inter-floor separation layer between the support member and the inter-floor separation layer, the buffer panel having a thickness T, wherein the damping member is disposed on an edge of the buffer panel. 3. The building material of claim 2, wherein the upper plate has a top surface contacting the bottom surface of the support member, and the connecting portion of the damping member contacts a side surface of the buffer panel. 4. The building material of claim 2, wherein the damping member extends along at least one side of the buffer panel, or the damping member includes a plurality of damping members spaced apart from each other along at least one side of the buffer panel. 5. The building material of claim 2, wherein the height H is greater than a sum of the height D and the thickness T. 6. The building material of claim 2, further comprising: a side buffer member vertically extending along side surfaces of the support member and the bottom layer above the inter-floor separation layer; anda washing board disposed to face the side buffer member above the bottom layer. 7. The building material of claim 6, wherein the side buffer member comprises an air passage extending in a vertical direction and having an inner space, and the washing board comprises a discharge passage communicatively connected to the air passage and connected to outside. 8. The building material of claim 7, wherein the discharge passage extends in a direction crossing an extension direction of the air passage, and the washing board has an upper end configured to cover an upper portion of the side buffer member. 9. The building material of claim 6, wherein the side buffer member has a bottom surface contacting the top surface of the buffer panel and a side surface of which at least a portion contacts the support member and the bottom layer, and the side buffer member is made of a same material as that of the buffer panel. 10. The building material of claim 1, wherein the upper plate and the lower plate of the damping member are in parallel with each other, and the upper plate and the lower plate of the damping member have a same surface area. 11. The building material of claim 1, wherein the support member comprises a metallic material, and the damping member comprises a material having a vibration-proof function. 12. The building material of claim 1, wherein the support member comprises a steel plate, and the damping member comprises a vibration-proof steel containing manganese. 13. The building material of claim 1, wherein the bottom layer comprises a lightweight aerated concrete layer, and the lightweight aerated concrete layer is wet-deposited on the support member and provided on the top surface and inside the protruding portion of the support member. 14. The building material of claim 1, wherein the height D is 10 mm to 40 mm.