Editing Casa Milà (section)

==== Loft ====
[[File:Attic of Casa Milà.jpg|thumb|right|150px|The attic]]
Like in [[Casa Batlló]], Gaudí shows the application of the [[catenary arch]] as a support structure for the roof, a form which he had already used shortly after graduating in the wood frameworks of [[Mataró]]'s cooperative known as "L'Obrera Mataronense." In this case, Gaudí used the Catalan technique of [[Catalan vault|timbrel]], imported from [[Italy]] in the fourteenth century.

The attic, where the laundry rooms were located, was a clear room under a [[Catalan vault]] roof supported by 270 [[parabolic vault]]s of different heights and spaced by about 80&nbsp;cm. The roof resembles both the ribs of a huge animal and a palm, giving the roof-deck a very unconventional shape similar to a landscape of hills and valleys. The shape and location of the courtyards makes the arches higher when the space is narrowed and lower when the space expands.

The builder Bayó explained its construction: "First the face of a wide wall was filled with mortar and plastered. Then Canaleta indicated the opening of each arch and Bayó put a nail at each starting point of the arch at the top of the wall. From these nails was dangled a chain so that the lowest point coincided with the deflection of the arch. Then the profile displayed on the wall by the chain was drawn and on this profile the carpenter marked and placed the corresponding centering, and the timbrel vault was started with three rows of plane bricks. Gaudí wanted to add a longitudinal axis of bricks connecting all vaults at their keystones".