屋根

1. Origins, structure, and basic meaning

• Structure: 屋根, read やね, denotes the exterior upper covering that protects a building from rain and wind.
• Basic usage: It names the upper covering of a warehouse lifted by wind and a red roof where a cat naps.

2. Common pitfalls and similar expressions

• Exterior roof rather than interior ceiling
  • It is the exterior covering that protects a building from weather, not the interior ceiling.