Device for forming a void in a concrete foundation

A device for forming voids in or adjacent to concrete structures, comprising:

• a substantially planar structure comprising a plurality of channels extending therefrom, wherein the plurality of channels are closed at a first end distal from the substantially planar structure and the plurality of channels is open at a second end proximal to the substantially planar structure;
• wherein the first end of the plurality of channels comprises at least one opening configured to allow surface material to be conveyed through at least one of the openings into the plurality of channels;
• wherein the device is formed from a molded pulp configured to inhibit penetration of water, wherein the molded pulp comprises wax such that the formed device comprises wax impregnated in the device;
• and
• wherein the device is configured to substantially support at least 75 lbs/ft2 of poured concrete during at least a portion of a curing process.