Meters of covered surface,
Meters of uncovered surface
and superexposed exterior of a common ladder.

Espero que te sea útil.

space on any storey of a building between interior,exterior walls required fire walls, including the space occupied by interior walls and partitions with exits and vertical service spaces.

The issue of "superficie cubierta y descubierta" is relatively straightforward, and is obviously referring to internal (roofed) space and external areas. However, the use of the word "superpuesta" is ambiguous. If we accept its literal tranlsation: to be superimposed upon/on top of, then it makes little sense. "Superponer" can also mean: to give preference to. We could, therefore, interpret this as meaning that the owner of this 'area' will have special access/right of passage through/to an external (outside) set of stairs which is also shared by other occupants.

Depending on context, Surface Area or Space, here, with metres, I would say the former. See CAPITALS below:

2.c.1. Superficies cubiertas
Son las que estando techadas, tienen cerramiento en todo su contorno.

COVERED SURFACE AREA or SPACE

2.c.2. Superficies semicubiertas
Son las que estando techadas, tienen su contorno parcialmente cerrado.

SEMI-COVERED....

2.c.3. Superficies descubiertas
Se llamarán superficies descubiertas todas aquellas que carezcan de techo.

UNCOVERED....

2.c.4. Superficies superpuestas
Cuando dos polígonos contiguos, susceptibles de propiedad exclusiva distintos, se superpongan o se penetren mutuamente en un nivel diferente al del piso de su planta, la proyección horizontal del polígono superior en la zona de penetración, se llamará superficie superpuesta. Esta situación da lugar a una limitación de propiedad exclusiva en un nivel especial intermedio entre los niveles superior o inferior, como sucede en el caso de *****escaleras, rampas, guardabaúles, entrepisos, etc.

(superficie superpuesta exteriores de escalera)
SUPERIMPOSED EXTERIOR STAIRWAY SURFACE AREA /SPACE


The exteriores in plural I can't be sure about but maybe you can figure it out from your context

The Spanish definitions are from: http://216.239.37.100/search?q=cache:OFDvUo9d-9wC:www.ec.gba...