Across
- 1. The top covering of a building.
- 4. wall: A wall dividing interior spaces.
- 7. A series of steps to move between floors.
- 9. The vertical part of a stair.
- 10. Material to seal joints on a roof against water.
- 11. wall: The outer boundary wall of a building.
- 12. A structure for venting smoke from a building.
Down
- 2. The surface you stand on inside a building.
- 3. A flat platform between stair flights.
- 5. A beam supporting the roof.
- 6. insulation: Material that keeps heat in or out.
- 8. The part of the stair you step on.