Drained vs cladding; always somehow ventilated (069)

This building, and its facade, could easily go unnoticed. It is correct, without bragging.
However, we wanted to draw attention to a very specific and pedagogical aspect. Even though the two façade systems being used are both formed by two sheets and a cavity in the middle, their behavior is very different. 
The outer layer made of flat plates with open vertical joints allows the entry and exit of air and water to and from the cavity through the joints. It is a ventilated and drained facade. 
The outer layer made of profiled sheet with overlapping joints does not allow water to enter (or exit) the cavity and will hardly allow ventilation through the joints. It is not a drained facade. However this cavity also needs ventilation to avoid condensation so we guess it is open at the upper and lower ends. 
The strategy to achieve the water tightness of both facades is therefore very different: the first resorting to a drained cavity; the second to an impermeable cladding.
Attending the thermal behavior, they are also very different. Regardless of how much each of the cameras ventilate, the color and material of the outer layers make their response to sun radiation different. We imagine that the choice of two different façade solutions responds, among other things, to the study of the sun movement and the requirements of interior spaces.

Student housing Garbí

Carrer de Viriat, 37-39
08014 Barcelona Barcelona
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Ph1 to Ph10 Andrés Echarri