Abstract: A building block that has two block walls joined by plastic webs. The block walls can be made of cement, clay brick, or similar materials. The block has the strength of a cinder block, but with much less weight. Moreover, the plastic webs are used as a handle to permit easy handling and placement of the blocks. Because of the thermal characteristics of the plastic webs, when a wall is finished using these blocks, it has the characteristics of a true double wall construction. The blocks are filled with concrete on one side of the block and filled with insulation on the other side of the center arm. This creates a structurally sound wall that is fully insulated. The blocks come in full-height, half-height, full-length and half-length sizes. There is also a corner unit design.