Jundiaí Residence: ArcelorMittal steel in an environmentally-friendly construction

This residential project was carefully designed to overcome challenging terrain around a forest clearing in an environmental preservation area, while ensuring minimal disruption to the environment. Special permission for the construction was granted by an environmental protection agency in Brazil, the Companhia Ambiental do Estado de São Paulo (CETESB).

Detailed information

In order to reduce the impact of the construction on the site, it was ensured that the limit line of the clearing and the surrounding forest would change as little as possible.

The conditions of the terrain posed a challenge in regards to sun exposure. Several studies were conducted to find the most appropriate location for the house.

The architects created an internal courtyard, allowing access to the bedrooms and living area. Balconies, pergolas, and the walkway connecting the rooms dilute the boundaries between the open and closed spaces, responding to the needs of sun protection and expanding the internal space.

To ensure the best use of the clearing, the project adopted a retaining wall orthogonally positioned in relation to the house. The retaining wall marks the division of the levels and divides the patio by supporting the pool on the upper level – for better sun exposure – while providing ample lawn area on the lower level.

A flat slab covering the corridor, located just below the steel roofing, allows for natural lighting and ventilation for the bathrooms.

Adoption of industrialised construction systems

The quest for simplicity in the single volume of the house was aligned with architectural solutions aligned in pursuit of simplicity of construction with the adoption of industrial components and elements that arrived ready-made to the construction site for assembly.

The architects and the engineering team worked together to define industrialised solutions from the very first sketches. A long design process began in order to find solutions to minimise the impact on the site - the steel structure, steel decking, and steel roofing system. These systems employed components that arrived at the jobsite ready for assembly. Secondary elements such as window frames, steel walkway, floor grids, stair treads, and guardrails also came ready for assembly.

The roofing (known as Global Roof) offers excellent thermo-acoustic performance, resulting in a milder temperature in relation to both hot days and cold nights, while the acoustic performance prevents noise from summer storms. Sound absorption through the acoustic lining (organic coated steel trays perforated with glass wool) brings comfort by reducing the reverberation of sound that would occur given the dimensions of the glass walls.

A unique floor covering was adopted for the entire interior of the house and the pergola areas. For the exterior, an interlocking brick floor was the solution selected for the drive, while stone was chosen for the pool deck.

The opaque parts of the facade painted white contrast with the grey of the steel structure, the deck, and secondary elements (pergolas, stairs, and guardrails).

Electrical and water systems (water supply and sewage) run on galvanised steel electric cable trays beneath the steel deck floor slab.

Solar collectors or photovoltaic panels were not employed as the solution was not feasible due to the high degree of shading. Drainage systems direct rainwater to the surrounding forest, and sewage systems were implemented with a high level of safety.

The residence is economical due to these industrialised systems.

Technical details

Steel structure: composed of hot rolled sections, welded profiles, and cold formed tubular profiles with bolted connections

Steel structure protection: first layer of primer resin and two layers of aliphatic polyurethane paint (corrosion category C2)

ArcelorMittal Perfilor products:

Steel deck: ZAR280 structural steel sheets - 0.80 mm thickness - Z275 coating

Roofing system (Global Roof):

  • prepainted steel perforated liner tray - 0.65 mm thickness - 400 mm with - 60 mm height
  • glass wool - 30 kg/m³ density - 50 mm thickness - for the absorption of interior sound and to increase the performance of the thermo-acoustic insulation
  • spacers in galvanised steel
  • galvanised sheet in ZAR 280 - Z275 coating - 0.80 mm thickness - to increase the specific mass of the system
  • glass wool - 40 kg/m³ density - 50 mm thickness
  • trapezoidal steel profile in organic coated steel - 0.65 mm thickness LR33 (paint layer 25 microns)

Cost breakdown (100.0%)

Foundations / land movement / retaining wall 16.6%
Structure 12.3%
Electrical systems 7.2%
Water systems 7.1%
Roofing and insulation 7.1%
Window frames 7.0%
Interior floor coverings 6.5%
Painting 4.6%
Masonry 4.5%
Design (engineers and co-authors) 4.2%
Exterior flooring 4.1%
Engineering costs 3.6%
Interior wall coverings 3.5%
Waterproofing systems 2.5%
External floor coverings 1.8%
Landscaping 1.7%
Preliminary services / site preparation 1.4%
Miscellaneous 4.3%

Materials and workforce breakdown (100%)

Materials 51%
Labour and services 49%


Beginning of design: 2012
Construction: from January 2015 to April 2017
Land area: 5 800 m²
Total built area: 268 m²
Location: Jundiaí, São Paulo - Brazil

Architects: Silvia Scalzo, Arch. and Francisco Cardoso, Eng.
Architects' co-authors: Mayra Rodrigues and Régis Sugaya
Landscaping: Silvia Scalzo and Celso Gazolli, Eng. (agronomist)
Structural design: Rosa Messaros, Eng.
Facilities design: Marcio Kato, Eng.
Construction: Luciano Mautschke, Eng.
Photos: Nelson Kon
Steel: ArcelorMittal
Manufacturer of steel structure: Planmetal
Roofing system and steel deck: ArcelorMittal Perfilor
Guardrails: Securifor Belgo Cercas
Thermo-acoustic insulation: Isover
Window Framing: Style Aluminum
Welded grids and stair treads: Marangoni
Electrical trays: Legrand

Project information

  • Jundiaí, São Paulo
  • Brazil
  • 2017
  • Architects:
    Silvia Scalzo, Arch. and Francisco Cardoso, Eng.
  • Engineering:
    Rosa Messaros, Eng. (Structural design)
    Marcio Kato, Eng. (Facilities design)
    Luciano Mautschke, Eng. (Construction)
  • Contractor:
    Planmetal (Steel fabricator)
  • Steel:
  • Photographer:
    Nelson Kon
  • Text:
    Constructalia - ArcelorMittal Europe for construction