Gunite question...is builder trying to screw me?
I am in the process of getting a gunite pool installed. During excavation, they hit shale with about 1-2 feet to go. After paying extra for the shale removal, the gunite guys came out and did their thing. I just got a bill for "extra material" during the gunite phase due to rock. I am trying to understand how hitting rock requires extra material. Anyone have an ideas?