Airform for facilitating construction of a structure

An airform that can be inflated for facilitating construction of a permanent structure, the airform comprising:

• a first portion comprising a first surface of revolution when the airform is inflated, wherein the first portion is configured to be disposed in a first shape and to form a first profile when the airform is inflated;
• a second portion comprising a second surface of revolution when the airform is inflated, wherein the second portion is configured to be disposed in a second shape and to form a second profile when the airform is inflated;
• wherein at least one of the following:
• the first surface of revolution is configured to be different than the second surface of revolution, the first shape is configured to be different than the second shape, or the first profile is configured to be different the second profile, when the airform is inflated;
• at least one transition portion comprising at least one portion of the airform that defines a transition from the first portion to the second portion when the airform is inflated, wherein the first portion and the second portion share at least one common radius of revolution at the transition when the airform is inflated;
• at least one reinforcement comprising at least one reinforcement member provided at the at least one transition portion, wherein the at least one reinforcement enables defining the transition from the first portion to the second portion and maintaining the first shape and the second shape when the airform is inflated;
• and
• at least one reinforcement retainer configured to retain at least one reinforcement member at the at least one transition portion;
• and
• wherein the airform is configured to facilitate the construction of a permanent structure.