Interlocking form assembly

A form assembly for molding a structural support of a predetermined configuration using a moldable forming composition, the form assembly comprising:

• a base member having planar first and second opposite side edges and a first planar surface and a second surface comprising a non-planar protuberance, the base member further comprising a planar corner surface extending between the first planar surface and at least one of the planar first and second opposite side edges forming a bevel;
• and
• a first extension member having a first surface and a second surface, the first surface comprising a recess and the second surface comprising a non-planar protuberance corresponding to the position of the recess of the first surface,
• wherein the base member and the first extension member are made of an expanded polystyrene and wherein the recess of the first surface of the first extension member is configured to receive the non-planar protuberance of the second surface of the base member.

A form assembly for molding a structural support of a predetermined configuration using a moldable forming composition, the form assembly comprising:

• a base member having planar first and second opposite side edges and a first planar surface and a second surface comprising a plurality of recesses and a plurality of non-planar protuberances, the base member further comprising a planar corner surface extending between the first planar surface and at least one of the planar first and second opposite side edges forming a bevel;
• and
• a first extension member having a first surface and a second surface, each surface comprising a plurality of non-planar protuberances and a plurality of recesses, wherein an occurrence of a non-planar protuberance on the first surface corresponds to an occurrence of a recess on the second surface and an occurrence of a recess on the first surface corresponds to an occurrence of a non-planar protuberance on the second surface, wherein the base member and the first extension member are made of an expanded polystyrene and wherein the plurality of recesses of the base member receive the plurality of non-planar protuberances of one of the first surface and the second surface of the first extension member while simultaneously the plurality of recesses of the same one of the first surface and the second surface of the first extension member receive the plurality of non-planar protuberances of the base member.

A method of using a form assembly for molding a structural support of a predetermined configuration using a moldable forming composition, the method comprising:

• providing a base member having planar first and second opposite side edges and a first planar surface and a second surface comprising a first recess, the base member further comprising a planar corner surface extending between the first planar surface and at least one of the planar first and second opposite side edges forming a bevel;
• providing a first extension member having a first surface and a second surface, the first surface comprising a non-planar protuberance and the second surface comprising a recess corresponding to the position of the non-planar protuberance, wherein the base member and the first extension member are made of an expanded polystyrene and wherein the recess of the second surface of the base member is configured to receive the non-planar protuberance of the first surface of the first extension member;
• and
• stacking the first extension member and the base member so that the non-planar protuberance of the first surface of the first extension member is fitted into the recess of the second surface of the base member.

A method of using a form assembly for molding a structural support of a predetermined configuration using a moldable forming composition, the method comprising:

• providing a base member having planar first and second opposite side edges and a first planar surface and a second surface comprising a non-planar protuberance, the base member further comprising a planar corner surface extending between the first planar surface and at least one of the planar first and second opposite side edges forming a bevel;
• providing a first extension member having a first surface and a second surface, the first surface comprising a recess and the second surface comprising a non-planar protuberance corresponding to the position of the recess, wherein the base member and the first extension member are made of an expanded polystyrene and wherein the recess of the first surface of the first extension member is configured to receive the non-planar protuberance of the second surface of the base member;
• and
• stacking the first extension member and the base member so that the non-planar protuberance of the second surface of the base member is fitted into the recess of the first surface of the first extension member.

A method of using a form assembly for molding a structural support, the method comprising:

• providing a base member having planar first and second opposite side edges and a first planar surface and a second surface comprising a plurality of recesses and a plurality of non-planar protuberances, the base member further comprising a planar corner surface extending between the first planar surface and at least one of the planar first and second opposite side edges forming a bevel;
• providing a first extension member having a first surface and a second surface, each surface comprising a plurality of non-planar protuberances and a plurality of recesses, wherein the base member and the first extension member are made of an expanded polystyrene and wherein an occurrence of a non-planar protuberance on the first surface corresponds to an occurrence of a recess on the second surface and an occurrence of a recess on the first surface corresponds to an occurrence of a non-planar protuberance on the second surface;
• and
• stacking the base member and the first extension member so that the plurality of recesses of the base member receive the plurality of non-planar protuberances of one of the first surface and the second surface of the first extension member while simultaneously the plurality of recesses of the same one of the first surface and the second surface of the first extension member receive the plurality of non-planar protuberances of the base member.