Not affecting the structure of something, especially a building.
This word is used when talking about buildings and safety.
Examples:
The nonstructural parts of the building are the walls and windows.
We need to make sure the nonstructural parts are safe too.
The nonstructural parts of the house are not as strong as the main parts.
The nonstructural parts are like the decorations on a cake.
The nonstructural parts of the spaceship are not as important as the engines.
The nonstructural parts of the bridge are not as strong as the main parts.