Once we got the old chimney down, it was a simple matter of rebuilding it to the same dimensions. In this case, modern bricks are slightly different dimensions than the original ones by 1/4″ in all dimensions. You might think it’s a small difference, but over the length of multiple bricks this became a larger issue. As you can see, our solution here was to slightly increase the joint size as well as add short 1 1/4″ cut-offs to make up the difference. We placed these in a way that created an offset pattern to make it more blended.