ALSH Rieux

Last modified by the author on 25/09/2018 - 12:10


  • Building Type : Other building
  • Construction Year : 2015
  • Delivery year : 2016
  • Address 1 - street : 56350 RIEUX, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 565 m2
  • Construction/refurbishment cost : 700 000 €
  • Number of none : 30 none
  • Cost/m2 : 1238.94 €/m2

Certifications :

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

The extension of the leisure building has been designed according to the criteria of the German Passivhaus label with a heating requirement of less than 15kWh / m².year for a heating set point of 20 ° C and a very high airtightness (test final at 0.51 volume per hour at 50 Pascal) .To achieve this exceptional thermal quality in a controlled budget, important work on the thermal envelope, the bioclimatic design, the airtightness and the choice of materials was carried out . Thus the walls and the roof are made of wood (framework and frame) of French origin, certified PEFC, integrating an insulation cellulose wadding infused and outer wood wool support mineral coating. A highly insulated concrete slab and wood-aluminum joinery in triple glazing complete this thermal envelope. A centralized double flow ventilation system with very high efficiency guarantees the air quality of the premises with very low thermal losses.
With respect to the Passivhaus label, the heating requirements are very low (according to the RT2012 thermal study carried out, only 4.2 kWh / m².year of final energy, ie around € 122 / year electricity for the heating of the extension). In addition, the need for domestic hot water is limited to a few lavas sanitary. Thus, to guarantee a great ease of operation, maintenance and economic viability, the residual heating of the premises is realized by direct electric transmitters and the production of sanitary hot water by electric balloons located near the needs. Feasibility studies have indeed shown that the choice of renewable energies on these two positions generates disproportionate investments compared to the savings made. The choice of materials is also a major axis of project design, with, in addition to the bio-based materials present in the insulation and the structure, the choice of interior coatings with a low environmental and sanitary impact (example: mineral paint without VOC), the choice of materials favorable to the hygrothermal comfort of the users (wood fiber, choice of a roof waterproofing of white color and 100% recyclable allowing an attenuation of the temperature up to 5 ° C). The passive calculation with the PHPP software indicates a total primary energy consumption of 89kWhep / m².year, including computer uses and appliances, all for less than 1200 € HT / m².

Sustainable development approach of the project owner

The commune of Rieux wished for a place for children healthy and perennial in time.

The interior materials are mainly biossed (wood frame, rubber floor, VOC-free paint ...). Particular attention has been given to the quality of air (renewal rate higher than the norm in force) The level of passive energy efficiency guarantees low charges to the municipality and is part of the local fight against global warming.

Architectural description

A sober but contemporary architecture has been adopted for the project to fit naturally into the urban landscape.

It was asked for a lime plaster finish on the wood frame to ensure easy maintenance for the municipality.

Building users opinion

The premises are pleasant to live in both winters and summer.


Construction Manager


Type of market

Global performance contract

Energy consumption

  • 33,90 kWhep/
  • 115,40 kWhep/
  • RT 2012

    Heating = 14.5kWhEP / m².year ECS = 3.4 kWhEP / m².year Lighting = 9.5 kWhEP / m².year Ventilation = 6.2 kWhEP / m².year Auxiliary and cooling = 0 kWhEP / m².year

Real final energy consumption

    33,90 kWhef/

    35,69 kWhef/

    2 017

Envelope performance

  • 0,19 W.m-2.K-1
  • Façades = wood frame with cellulose fiber filling + wood fiber in external insulation: U = 0.147W / m².K
    Wood roof U = 0.116W / m².K
    Insulated concrete slab under screed (polyurethane to limit thickness): U = 0.175W / m².K
    Exterior joinery wood / aluminum triple glazing Uw = 0.94W / m².K (including thermal bridge implementation)

  • 0,87
  • n50

  • 0,51
  • There is nothing to manage apart from the annual maintenance of the dual flow ventilation unit.

More information

Consumption according to PHPP calculation = 89 kWhEP / m².year


    • Electric radiator
    • Individual electric boiler
    • No cooling system
    • Nocturnal ventilation
    • Free-cooling
    • Double flow heat exchanger
    • No renewable energy systems

    - CTA Helios KWL EC 2000D Pro certified PHI
    - Electric radiators Noirot Shocks R21 6 orders for a total power of 14kW
    - ECS electric with a ball under sink of 15L and a suspended balloon of 50L

    Les gains passif sont réalisé grâce à la conception bioclimatique et l'enveloppe de niveau Passivhaus: larges baies vitrées Sud, enveloppe thermique très performante, dalle avec chape béton pour inertie,... Cette conception est complétée par une étanchéit

Urban environment

  • 2 500,00 m2
  • 30,00 %
  • The building is part of the extension of the old ALSH granite rubble.

    The site is located in the village center


    CTA Helios KWL EC 2000D Pro certified PHI


    Génie climatique, électricité / Ventilation, rafraîchissement

    Extra-low flow dual-flow power station with energy recovery, for suspended ceiling mounting.
    Ideal for centralized ventilation of residential, tertiary and industrial premises.

    High energy efficiency, tested according to PassivHaus Institute criteria.
    Very compact unit with numerous equipment variants.
    Flexibility of connection, simplicity of installation.

Construction and exploitation costs

  • 59 500
  • 436 000

Water management

    not measured

Indoor Air quality

    Passivhaus certified double flow ventilation with filter F7 / G4

    In occupation, the ventilation rate is 1065m3 / h, ie 0.71vol / hFlexible soft Forbo class A + Mineral paints KEIM COV <1g / L


    South facade very largely glazed with 39m ² of joinery is 47% of the facade. Presence of a horizontal sun breeze from BUGAL (Calero model) with a depth of 1.2m to avoid dazzling and thermal discomfort in summer.

    Sun protection supplement with external roll-up blinds of the SOLTIS 86 type for joinery not protected by the BUGAL sun breeze. These protections also make it possible to avoid glare while guaranteeing natural illumination, even when the protection is lowered, except in the nap rooms where the fabric is blackout. The lighting of the living spaces has a manual dimming which makes it possible to adapt the light. lighting to activities and external conditions. All facades have opening frames allowing natural ventilation through mid-season and summer providing additional comfort. Finally, the concrete screed provides the necessary inertia for the attenuation of the thermal load of the building.

    PHPP calculation: Frequency of overheating = 7% at 25 ° C

GHG emissions

  • 2,40 KgCO2/m2/an
  • Calculation method of the E + C- label (software pleiad)

  • 716,48 KgCO2 /m2
  • 50,00 année(s)
  • 836,51 KgCO2 /m2
  • Calculation method of the E + C label

Life Cycle Analysis

     Resultat E2 C2


  • 0,57 kWhEP
  • Frame building + timber frame, from frabçais and certified PEFC

    Insulation of cellulose wadding walls and wood wool panelsInstallation of triple glazed wood-aluminum joinery Interior coatings with ecolabels and low VOC content (class A +) for mineral paints, for Forbo PVC floors

Reasons for participating in the competition(s)

  • ENERGY: Passive building (in the process of being certified) with total consumption of less than 89kWhep / m².year, including computer and appliance uses, and heating requirement below 13kWh / m².year for a set point of 20 ° C
  • HEALTH: Use of healthy interior materials (VOC-free mineral paint, tiles, Class A + PVC floors) coupled with double flow ventilation with incoming air filtration and flow rate suitable for use
  • CARBON: Use of biosourced and recycled materials: frame and wood frame walls insulated in cellulose wadding and wood fiber, mixed wood-aluminum joinery
  • COMFORT: Increased hygrothermal comfort due to good inertia in the building (stone slab wall, concrete slab), passive level insulation, fixed and mobile outdoor solar protection, clear colors of the coatings outside that return the heat.

Building candidate in the category

Bas Carbone

Bas Carbone

Coup de Cœur des Internautes

Coup de Cœur des Internautes

Prix des Etudiants

Prix des Etudiants

Green Solutions Awards 2018 - Bâtiments

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Tugdual ALLAIN


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Green Solutions Awards 2018 - Bâtiments