Our technical team began analysis of the coating upon immediate arrival on-site and collecting data throughout the entire demo project. The coating had an even shape with 8.3" average of thickness. In the end of the kiln (uphill), there were two coating rings. However, we couldn't measure as they collapsed one of the kiln turns during demolition.
We measured the brick and identified capping between 21 ft and 60 ft. In this section, the brick was losing 1-3" of thickness. No section was twisted/spiraled.
To identify the cause of the loss of thickness, we'd need to perform as detailed stuck and conditions of the process and compare to the last ovality study looking for possible mechanical stress.