Patent ID: 7415804

Claim:
An insulating concrete form, the form comprising: first and second substantially opposing panels, each panel having a top surface, bottom surface, first end surface, second end surface, an exterior surface defining a wall and an interior surface for receiving concrete, with the first end surface and second end surface of the first panel and second panel having both a tongue and groove, disposed such that on the first end surface of the first panel the tongue is proximal the exterior surface and the groove proximal the interior surface, on the second end surface of the first panel the groove is proximal the exterior surface and the tongue proximal the interior surface, on the first end surface of the second panel the groove is proximal the exterior surface and the tongue proximal the interior surface, on the second end surface of the second panel the tongue is proximal the exterior surface and the groove proximal the interior surface, the panels disposed such that the first end surface of the first panel opposes the first end surface of the second panel and the second end surface of the first panel opposes the second end surface of the second panel; and at least two ties interconnecting the first panel and the second panel, each of said ties comprising at least three vertical and at least three horizontal wires attached at each intersection between the vertical and horizontal wires and arranged to form a grid and metal strips welded to the horizontal wires adjacent the opposite ends thereof and arranged perpendicular to the grid plane and embedded within the panel; whereby two or more forms may be horizontally positioned and interlocked to form a planar surface by means of a joint formed by both a tongue and a groove on each panel of one form interconnecting with a groove and a tongue on each panel of another form, the forms being reversibly connectable such that the first end surface of the first and second panels of one form may be joined with either the first end surface or the second end surface of the first and second panels of another form.