Silos are made of a standard press-bended upright frame and of a bunch of corrugated shhets both in a galvanized steel material called S350GD + Z375. Galvanized bolt are the main junctions of the elements, the structure is impermeable because it is made of a thermoplastic sealing and special PVC washers which accompain the bolts and nuts.
The roof is covered by a layer of structural galvanized steel S350GD+Z375 composed by trapezium nervated elements with a 30° inclination.