What are the opposite words for understructure?

Understructure refers to the foundation or base of a building or structure. Some antonyms for understructure could include top, surface, or peak. These words describe the opposite of understructure, which is at the bottom or foundation of a structure. Another antonym could be overhead, which refers to the upper part of a structure or the sky above it. Other antonyms for understructure could include exterior, perimeter, or edge. These words describe the outside or boundary of a structure rather than the foundation. Antonyms provide a way to describe a concept by looking at it from a different angle or perspective.