Buildings - features and general vocabulary

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Across
  1. 3. A curved symmetrical structure spanning an opening and typically supporting the weight of a bridge, roof, or wall above it
  2. 4. Material used to stop heat escaping
  3. 7. Not harmful to the environment
  4. 9. The lower surface of a room that people walk on
  5. 10. The inside of something, especially a building
  6. 14. The outside of something, especially a building
  7. 15. A plan or drawing produced to show the look of something
  8. 16. A design plan or other technical drawing
  9. 17. Similar to a steeple but usually a narrower structure
Down
  1. 1. Large, upright pillar, typically cylindrical, supporting the upper part of a building
  2. 2. A platform enclosed by a wall or bars on the outside of a building, with access from an upper-floor window or door
  3. 5. A tall pointed roof, usually on a church
  4. 6. The top inside surface of a room
  5. 8. A rounded roof
  6. 11. A tall, narrow building, either free-standing or forming part of a large building such as a church or castle
  7. 12. A long set of steps inside a building joining the different levels
  8. 13. A tall vertical structure of stone, brick, wood, or metal, used as a support for a building