Bosco Verticale

Location: Milan,Italy
Design firm: Boeri Studio
Typology: High-rise
Years: 2007–2014
Status: Complete

Facade facts

Facade summary: Staggered cantilevered concrete balconies carrying soil-filled planters and mature vegetation, set against an insulated rainscreen clad in dark porcelain stoneware tiles.
Documented intention: The architects designed the envelope to function as a dynamic biological shield. The intention was to use living foliage to filter dust and solar radiation,absorb CO2 and noise,produce oxygen,mitigate the heat island effect, and establish a natural habitat for urban birds and insects.
Street relationship: The facade acts as a vertical continuation of the adjacent public park, transforming the dense streetscape by bringing extensive biomass into the sky and improving the visual environment at street level.
Climate relationship: The biological envelope provides seasonal environmental modulation: in summer, dense leaves block direct solar radiation and cool the interior via evapotranspiration;in winter, bare deciduous branches allow solar gains to reach the interior glazing.
Window pattern: Irregular, rhythmic distribution of large glazed openings set back behind the staggered projecting balcony frames.
Glazing: Double-glazed low-E safety laminated glass
Depth: Highly deep and cellular, with asymmetric structural projections extending up to 3.35 meters.
Rhythm: Staggered, non-aligned vertical composition designed to give room to tree crowns.
Reinforced Concrete: Reinforced Concrete — Balconies and integrated planter boxes — Fair-faced,smooth painted plaster
Porcelain Stoneware: Porcelain Stoneware — Ventilated facade opaque walls — Matte,textured tile
Low-E Double Glazing: Low-E Double Glazing — Apartment sliding doors and windows — Reflective,transparent
Vegetation: Vegetation — Balconies across all elevations — Dynamic organic plant tissue
Stainless Steel Safety Cables: Stainless Steel Safety Cables — Planters to tree trunks — Metallic,stranded wire
Ventilated Rainscreen Cladding: Porcelain stoneware tiles mechanically fixed to an aluminum framing grid, backed by a layer of high-density mineral wool insulation.
Structural Planter Irrigation and Drainage System: A multi-layered system featuring waterproof root-barrier membranes,non-clogging filter fabrics,lightweight expanded clay aggregate soil mixes, and integrated moisture sensors linked to automated drip-irrigation loops using treated HVAC groundwater condensate.
Structural Tree Anchoring System: Three levels of wind-restraint systems: root-ball steel mesh anchors,base trunk ties, and emergency steel safety cables to prevent tall trees from falling in high-altitude storms.

Description

The facade is dominated by heavy, irregular cantilevered reinforced concrete balconies projecting up to 3.35 meters. These balconies support large precast planters equipped with root barriers, drainage layers, and drip-irrigation systems. Behind the planters, the building envelope consists of high-performance thermally broken aluminum frames with double-glazed low-E glass. The solid opaque portions of the exterior walls are finished with an insulated ventilated rainscreen cladding system using large-format dark grey porcelain stoneware tiles. Dynamic living plants (trees, shrubs, and flowers) populate the balconies on all four orientations, customized to local solar and wind exposure.

Visual analysis

Visually, the structure appears as an ever-changing organic sculpture. The heavy grey architectural lines of the concrete terraces and dark porcelain tiles are softened by cascading foliage, turning the building into a seasonal canvas of shifting colours, textures, and shadows.