A covering of concrete placed on the exposed top of an external wall, is known as

1. Cornice
A horizontal projecting moulding provided at the top of a wall or below the roof.
It improves the appearance of the building and helps throw rainwater away from the wall.
2. Coping
A protective cap placed on the top of a parapet or boundary wall.
It prevents rainwater from entering the wall and protects the masonry.
3. Frieze
The horizontal decorative band between the architrave and the cornice in classical architecture.
It is mainly used for ornamentation and may contain carvings or patterns.
4. Lintel
A horizontal structural member placed over doors, windows, or other openings.
It supports the load of the wall above the opening and transfers it to the side wall.

The floor is rubbed with oxalic acid, for making its surface