National Pools of Roanoke, Inc. builds Gunite pools. Gunite is pneumatically applied concrete, which can achieve strengths of 6000 to 7000 PSI (cast in place concrete is usually 3000 to 3500 PSI). Gunite's strength is the result of the dense packing of the material as it is sprayed, as well as the fact that a relatively small amount of water is required to hydrate the cement.
Gunite has been used in the construction of swimming pools for well over 30 years. This includes Olympic competition pools and the swimming pool at the White House in Washington, DC. Gunite is uniquely desirable for pool construction because of its inherent strength as well as it's adaptability to unusual shapes. Gunite is particularly useful on vertical surfaces such as pool walls where extra strength is important.