How Are Block Walls Built? There are several steps. In this video, Brad Bachand describes how cinder block structures are built including: How the block walls are tied into the slab/footing using rebar. How the block walls are laid and how window openings are created. What is a concrete lintel? What is a tie beam? What does it mean to fill the cells in a block wall? How does a new bloc structure get matched up to an existing structure and look good? If you have a room addition in Dunedin, FL tha