District town hall in Saint-Etienne

8675
Last modified by the author on 08/02/2013 - 14:53

Renovation

  • Building Type : Office building < 28m
  • Construction Year : 2012
  • Delivery year :
  • Address 1 - street : 94 boulevard Alexandre de Fraissinette 42100 SAINT-ETIENNE, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 380 m2
  • Construction/refurbishment cost : 650 300 €
  • Number of Work station : 20 Work station
  • Cost/m2 : 1711.32 €/m2

Certifications :

  • Primary energy need
    65 kWhep/m2.an
    (Calculation method : RT 2012 )
Energy consumption
Economical buildingBuilding
< 50A
A
51 à 90B
B
91 à 150C
C
151 à 230D
D
231 à 330E
E
331 à 450F
F
> 450G
G
Energy-intensive building

To reduce travel, improve both quality and quantity, to bring in the outlying districts of St Etienne downtown, services to the population, the municipality wanted to make a local municipality in the district Métare.

This project is set in the continuity of the existing shopping center, in a former business located at one end of the commercial.Only a slight inclination of the northern façade creates a hook, to enhance the entrance to the district town hall.The existing cap is maintained and slightly-thickened to allow revegetation of the roof. The cap is encapsulated and supervises the building to souligner.Les horizontal cladding facades are pierced wood rétifiés randomly. The principle of cross-linking is a process of "cooking" the wood at high temperature without adding any chemicals.

Only the eastern façade is vegetated and gives the impression of a continuous roof / façade.  The heating the entire building is for a heat pump Brine / water. First three vertical geothermal probes, 90 m depth, are installed in the building. Thereafter, the heat pump will supply a network-type floor heating radiator. In case of strong heat, this system is reversible, it is possible to cool by turning on the pump heat.

The building is insulated, partitionned and painted with a minimum of materials emitting VOCs (volatile organic compounds), formaldehyde, fiber , particles and fibers toxiques. The town hall has been designed to achieve HQE requirements and get the BBC Effinergie label (low consumption label).

Sustainable development approach of the project owner

Objective of the Client: The provisional program of the near Town Hall is based on experiments conducted by other local government authorities or utility companies. The principles used to segment consist primarily public to adapt the response of the institution to the specific request of the user. The City of Saint-Etienne, mindful of the repercussions of its projects on the environment, is part of a High Environmental Quality (HQE). Hall of near future will qualify BBC Effinergie. Integration into the City of the Future: This project also raises the issue of rehabilitation of built heritage of the 20th century and its integration into the contemporary city. How to restore to a new use and a new face? To prepare the city for the future, it may be necessary to first identify the basic elements that make up the city of today and the question of their futures and their ability to change. This project proposes an answer based on the conservation of bearing elements and liaison with adjoining existing environment by integrating energy performance, design and innovation.

Architectural description

- Building in the continuity of a single all commercial ground floor. - North and South Frontage wooden retified two species spruce and poplar. - Green roof for rainwater retention and visual comfort for buildings around. - Plant wall supplied by a drip storm drains. - Double glazed aluminum joinery and high performance. - Double insulation inside and outside. - Geothermal heating and underfloor heating. - VMC double flux detector with CO ². - False ceiling curved wood in the lobby

Building users opinion

Satisfied, calm and clear space. Very good soundproofing qualities between rooms.

If you had to do it again?

Dimensions of windows overlooking the green wall that seems a bit small.

See more details about this project

Stakeholders

    Construction Manager

    Atelier d'Architecture RIVAT

    53 cours Fauriel 42100 Saint-Etienne, 04 77 38 01 66, [email protected]


Contracting method

Separate batches

Type of market

Global performance contract

Energy consumption

  • 65,00 kWhep/m2.an
  • 150,00 kWhep/m2.an
  • RT 2012

    Heating: 17.9 Cooling: 6.71 Lighting: 9.79

  • 350,00 kWhep/m2.an

Real final energy consumption

    59,00 kWhef/m2.an

Envelope performance

  • 0,32 W.m-2.K-1
  • Composition of the main facades:
    - Cladding thermally treated wood
    - Pare rain
    - Insulation 190mm Rockmur naked
    - Wall agglomerated hollow 20 cm lime plaster for airtightness
    - 100mm + 13mm Placomur

  • 0,80
  • I4

  • 0,43

More information

Being collected by GTC

Systems

    • Geothermal heat pump
    • Low temperature floor heating
    • Individual electric boiler
    • Reversible heat pump
    • Floor cooling
    • Double flow heat exchanger
    • Heat Pump on geothermal probes
  • 83,00 %

Smart Building

    GTC Town of St Etienne-existing system when creating the building

Urban environment

  • 380,00 m2
  • 100,00 %
  • Neighborhood is primarily residential tall buildings. Project implementation in the only commercial "bar". Passing through Boulevard noisy and with heavy traffic.

Product

    RETIBOIS (thermally treated wood)

    RETIWOOD

    36, avenue Hoche 75008 Paris

     http://www.retiwood.com

    Management / Others

    Retification is the first heat treatment of wood.
    Result of research at the Ecole Supérieure des Mines de St Etienne, the patented process of cross-linking, developed since 1997 is the reference in the field of ecological preservation of wood.
    No chemical modified by the action of heat controlled to a degree, the thermally treated wood is stable, exceptionally durable and 100% natural.
    Applied to local species, the cross-linking allows poplar, pine, ash ... to be used outdoors in the most exposed situations without changing appearance.

    Perfect acceptance of the product since it doesn't require any treatment in the long term (no varnish). In addition, it is a local process.

    https://www.construction21.org/france/data/sources/users/1458/bois-retifie.doc

Construction and exploitation costs

  • 650 000,00
  • 1 450,00
  • 75 300,00

Water management

  • 47,00 m3
  • 25,00 m3
  • Public building: the water can not be recycled or recovered. The reclaimed water is used to irrigate the green wall.

Indoor Air quality

    Choice of materials based on their data sheets and their FDES

GHG emissions

  • 12,30 KgCO2/m2/an
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Author of the page

Julien RIVAT

Architecte D.P.L.G. - Q.E.B.


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