Stakeholders

Construction company

GTM Bâtiment

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Certification company

CERTIVEA
certivea@certivea.fr - 01 40 50 29 09

Contracting method

Lump-sum turnkey

Owner approach of sustainability

"Foncière des Régions" as general contractor is committed through its policy on its green heritage:
The offices represent 65% of share heritage of the group.
The policy of sustainable development of Foncière des Régions is reflected in particular by a continuous improvement of environmental performance of this office park, throughout the life cycle of buildings.
This approach places the comfort and health of the user to the center and takes into account all the environmental dimensions: choice of locations, equipment and materials, based on life cycle assessment (LCA - to measure and reduce the impact) or the digital building modeling (BIM - to optimize the control of each step).
"Foncière des Régions" has met one year ahead , the goal of holding 50% of Legacy Land Offices Franc at the end of 2015.
This park "greening" strategy of Foncière des Régions is also deployed in other activities of the group products.

Architectural description

This building of 11,200 sqm, located on the historic site of the old rusk Heudebert in the old Nanterre, becomes the new headquarters of the company "GTM Bâtiment". While retaining some of the original façades, this renovation is a key element of the urban renewal district. Modern, bright and spacious, these offices include a company restaurant and a cafeteria on the ground floor. The building rests on a basement level sheltering 193 parking spaces.

Building users opinion

The building is comfortable thanks to:
Its internal lighting atmosphere.
Its qualities of acoustic isolation from the street as between spaces
It best hygrothermal comfort with the use of reversible radiant ceiling
It quality green spaces including a roof terrace
Olfactory comfort guaranteed by ventilation rates higher than the minimum regulatory, and the use of materials with low VOC emissions

Energy consumption

• Primary energy need : 69 kWhep/m².an
• Primary energy need for standard building : 185 kWhep/m².an

RT 2005

• Final Energy : 67 kWhef/m².an
Breakdown for energy consumption :

Heating: Cooling 52.5% 3.9% Production ECS: Fans 7%: 20.7% Lighting: 10.8% Auxiliary: 5.1%

More information :

Followed by GTB end consumption through an extended commissioning. The construction process also participate in a certification "OXYGEN" , an eco-commitment of Vinci Construction France, which secured the building performance in its operation.

Envelope performance

• Envelope U-Value : 1 W.m^-2.K^-1
More information :

High thermal inertia building with its exterior insulation.
Thermal insulation of the current wall on the outside provided by 180 mm insulation with Lambda 0.032 W / (mK) giving a Up = 0.17 W / (m².K).
Reinforced sunscreen on exposed facades (BSO).

I4

• Air Tightness Value : 1

- Widget - Display consumption on TV - multi-business controls (lighting, heating, blinds)

Systems

Heating system :
• Gas boiler
• Water radiator
• Electric heater
• Radiant ceiling
• Fan coil
Hot water system :
• Individual electric boiler
• Solar Thermal
Cooling system :
• Water chiller
• Fan coil
• VAV Syst. (Variable Air Volume system)
• VRV Syst. (Variable refrigerant Volume)
• Radiant ceiling
Ventilation system :
• compensated Air Handling Unit
• Double flow heat exchanger
Renewable systems :
• Solar Thermal
• Renewable energy production : 6 %

Smart Building

BMS :

Regulation and Building Management System (GTB) energy efficient class A. Implementation of environmental awareness of the user devices including a dynamic display of global consumption, batch and office. Setting up a portal

Individual control systems available to offer users an optimized ergonomics to quickly and simply act on all comfort parameters. The touch tablet,provides an icon that indicates the impact of the set of variations on the energy efficiency of the building

GHG emissions

• GHG in use : 6 KgCO₂/m²/an

Methodology used : Calculation method RT CSTB

Indoor Air quality

Air flow regulating devices according to the CO2 concentration in the high occupancy areas.

Health & Comfort

Terminal processing device by reversible radiant ceiling technology offering different advantages: - reduced air speeds - Homogeneity of temperature in space - optimized Perceived temperature - dust brewing Limitation

Product

Innovative vegetated roof terrace
TOPAGER
http://topager.com

Structural work / Carpentry, cover, titghtness

On this pilot project, the two roof levels were treated differently:
The first level is an accessible roof terrace with a semi-intensive type of vegetation with many biodiversity-friendly developments (bundles of firewood, wetlands, stones, sand). This level also features a roof garden to sensitize users of biodiversity and urban agriculture.
The second level roof (roof technology) was treated by the implementation of an innovative unplanted substrate allowing colonization by spontaneous vegetation. This level also has bird nest boxes and bat.

The product was created through the involvement of all stakeholders of the project and is very well received by users, aware of the improvement of the living environment that this development represents.

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Energy recovery
FRANCE AIR
http://www.france-air.com/

HVAC, électricité / ventilation, cooling

Heat recovery unit dedicated to professional kitchens

Product well accepted by the project stakeholders

Urban environment

The project is in a highly urbanized environment with shops, services and transport nearby

Green space

2 221

Parking spaces

- Bicycles - Charging stations for electric cars

Building Environmental Quality

• Building flexibility
• biodiversity
• works (including waste management)
• consultation - cooperation
• comfort (visual, olfactive, thermal)
• water management
• energy efficiency
• renewable energies
• maintenance
• products and materials