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.

A method for forming a self-leveling floor includes: positioning an edging form on or adjacent to a subfloor so as to at least partially bound an area on which a self-leveling floor is to be formed, the edging form including: a body having a top face, a bottom face and a first side face that extends between the top face and the bottom face; and a plurality of spaced apart channels extending entirely through the body from the top face to the bottom face, each of the plurality of channels also passing through at least a portion of the first side face. A self-leveling flooring material is dispensed into the area in which the self-leveling floor is to be formed so that the self-leveling flooring material flows against the first side face of the body and into each of the plurality of channels.

An edging form for use in forming a self-leveling floor includes an elongated body having a top face, a bottom face, and a first side face that extends between the top face and the bottom face, the body being made of a polymeric foam. A plurality of spaced apart channels extend entirely through the body from the top face to the bottom face and pass through at least a portion of the first side face.

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.