To lay flagstone on a Concrete Block Wall, you have to choose decorative flagstone that is approximately the same width as the top of the concrete block wall. After that, clean the top of the concrete block wall thoroughly with a stiff-bristled brush and sweep it cleans with a whisk broom. Then, Lay down a solid line of stonework construction adhesive along the top of the concrete block wall. Next, Place a flagstone on top of the concrete block and press it down firmly. You need to Position another flagstone end-to-end with the first one.
You must select a flagstone with edges that fit together with the first one as closely as possible. Forth, continue the same process down the length of the wall. When you approach a corner, you should fit the stones together as closely as possible. You can maintain the flagstones in a straight line on top of the concrete block wall.