Spas shell require to be supported by a frame structure and cladding material. The frame is the backbone and support for the entire spa needs to be strong, stable and weather resistant.
Steel Sub-Structure: Steel has the highest strength to weight ratio of any building material.
Corrosion resistant alloy steel will never rot, crack or split and is not affected by insects
Wood Sub-Structure: Wood is the most common material used to support spa shells. There are many different types of wood used to build a sub-structure. High quality cedar and wood treated with preservatives provided the best protection against rot, cracking, splitting and insects.