Abstract: A special high durability, building device and process to construct same. This device is essentially comprised of a base or chassis, an expanded polystyrene foam, structural members (of various materials and shapes) inside the foam and a cementitious material sprayed on the exterior of the foam. The configuration is such that the walls, floor, and roof are rigidly attached to each other yet maintain good flexural strength to resist wind loads and temperature changes. The system is anticipated for mobile and manufactured homes as well as other residential and commercial use. The construction of buildings has the cementitious coating to most surfaces and the structure uses minimal or no non-durable materials such as wood, nails, and screws. This provides resistance to surface damage to walls, rot, and decay.