The mining industry spans the globe, as do alumni of the University of Arizona mining and geological engineering program. Many got their feet wet working as interns for Arizona-based mining companies like Freeport-McMoRan.
Weight A 1 Â½ inch thick countertop made of standard concrete has an approximate weight of 18.75 pounds per square foot. (Granite is approximately 18 pounds per square foot.) Standard cabinetry will typically support this weight because itâs distributed over a large area.
The flat concrete roof itself can be up to 7 inches thick although the greater the thickness, the more the concrete will need be poured in increasing numbers of layers, with each one needing to dry before the next is poured. The roof needs to be thick in order to provide insulation and proper protection.