It is 1 piece To survive under extreme weather conditions and decades of service, there are many aspects of the membrane structure that must be properly designed. The goal of a membrane structure is simple: sufficient, equal tension across the entire 3D surface of the fabric. To achieve this, several intelligent choices must be made in relation to: – Fabric selection – Chained curves – Correct prestretch – Shaping and design – Sufficient 3D shape – Suitable structural supports – Connection to lengths – Accurate measurement – Fabric manufacturing The fabric is assembled using large machines. For PVC structures, high bonding effects on the fabric join and are as strong as a single fabric thus the term “membrane”.