A Unique Approach to Keep Exact Gunite Thickness in a Chimney Stack Many times, gunite jobs are fairly straightforward; a refractory contractor can just “go in and blow” the gunite to install the refractory material. One of our recent gunite jobs, however, was quite complex. Our client was an Original Equipment Manufacturer (OEM) who had engineered and built two 40-foot steel “stack tops” that would be installed as the final piece on a 200-foot stack at a plant in the southeastern US. The weight was critical in these stack tops. The stack tops were designed without flanges, so they’d be lifted via crane and placed on top of the existing 160 plus-foot stack and welded 100% solid, both inside and out. Normally, in these types of jobs, the refractory is gunned in place. However, with the very

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