Patent ID: 7739845

Claim:
A substantially rectangular building block comprising: a first segment made of a cementitious material having a core hole; a separate second segment made of a cementitious material engaging said first segment to create a central serpentine receiving opening; an insulation insert generally contoured to the shape of said serpentine shaped receiving opening and positioned in said receiving opening; at least one dovetail projection extending inwardly from each first segment and at least one receiving opening in each second segment receiving said projection and connecting said first and second segments with said insulation insert therebetween; and a means for maintaining said insulation insert in said receiving opening being at least one of said dovetail projections having a depressed ledge substantially parallel to an upper surface positioned on said inwardly extending projection and on said receiving opening proximate to the upper surface of the interior of the block as a resting place receiving a planar lip extension of said insulated insert.