One or more refractory panels (the 1-inch thick fireproof panels lining the fireplace wall) were significantly damaged and need replacing at this Suwanee home inspection. A qualified contractor should replace refractory panels as necessary. Typically, this is when cracks exceed 1/4 inch in width, where surface pitting becomes extensive and deeper than 3/16 inch, or where any piece of the refractory larger than 2 inches in radius and 3/16 inch deep has become dislodged.