Prefabricated wood-concrete hemp panel building - Triballat

Last modified by the author on 11/06/2018 - 10:23
  • Building Type : Office building < 28m
  • Construction Year : 2017
  • Delivery year : 2018
  • Address 1 - street : 35530 NOYAL-SUR-VILAINE, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 935 m2
  • Construction/refurbishment cost : 1 620 000 €
  • Number of Work station : 50 Work station
  • Cost/m2 : 1732.62 €/m2

Certifications :

  • Primary energy need
    49.2 kWhep/
    (Calculation method : )
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 building is intended to receive the computer service of the company Triballat Noyal. Designed in the architectural style of the head office on the site, the book stands out for its eco-design, an echo of the owner's policy. The use of locally sourced biobased materials and bioclimatic design make it possible to register the building in a process of labeling low carbon building.

The building has been the subject of a constructive innovation: Creation of wood-concrete hemp panels.

Sustainable development approach of the project owner

Triballat Noyal, dairy engaged in organic and vegetable, had the will to build a high-performance building and using bio-sourced materials and especially hemp, plant which they exploit the seed for their food products. It is a way to enhance the agricultural sector as a whole and build a building that reflects their philosophy.

Architectural description

The building takes the aesthetics of the seat on the same site and designed by Koutev agency.

The sobriety lies in the choice of simple and qualitative finishes. The white lime-sand plaster emphasizes the wooden window frames underlined by joineries and black sun breezes.

See more details about this project


Construction Manager


Contracting method

Separate batches

Type of market

Table 'c21_algeria.rex_market_type' doesn't exist

Energy consumption

  • 49,20 kWhep/
  • 96,40 kWhep/
  • • Heating: 28.1 kWh (ep) • Cooling: 0 kWh (ep) • ECS: 1.4 kWh (ep) • Lighting: 15.1 kWh (ep) • Auxiliary ventilation: 14.3 kWh (ep) • Auxiliary distribution: 0 kWh (ep)

Real final energy consumption

    20,20 kWhef/

Envelope performance

  • 0,72 W.m-2.K-1
  • The Building Envelope consists of a wood frame embedded in hemp concrete (integrated insulation) and improved with thermal insulation from the outside in rigid wood wool panels.

  • 0,70
  • The airtightness is 0.7 at the intermediate test is better than what we had targeted in the study RT (0.92) and this value will probably come down for the final test. The RT study will therefore be retouched.


    • Individual electric boiler
    • Individual electric boiler
    • No cooling system
    • Double flow heat exchanger
    • Solar photovoltaic
  • 16,47 %
  • • Individual electric heating
    • Double flow central ventilation with heat exchanger

    • 90 m² of photovoltaic panels on the roof, supplying the lighting and the C.T.A.

    • Élimination de la quasi-totalité des ponts thermique (ITE et isolation répartie), triple vitrage argons...

Smart Building

    • The lighting is provided by LED bulbs. Beyond the presence of a manual switch, their brightness varies according to the solar input in the building through a home automation system using photoresistances.
    • Solar breezes and solar caps are equipped with a home automation system allowing the inclination of the blades for the regulation of the solar gains in the offices.

Urban environment

  • 7 295,00 m2
  • 5,69 %
  • 921,10
  • The building is located in an ABF classified area. Its lime and zinc roofing give it a perfect coherence with the existing architecture.


    Chènevotte (Hemp concrete)

    Agro Chanvre

    Agro Chanvre : Email: [email protected], Tel : 02 33 59 29 96 / 06 88 56 15 90

    Second œuvre / Cloisons, isolation

    Among the bio-sourced materials, hemp needs to be better known. This plant growing without phytosanitary product and without irrigation is very useful for crop rotation. It is then fully recoverable:
    its very nutritious seeds are processed for food and cosmetics
    its fiber is used for textiles, paper or even bioplastics
    the chènevotte, located at the heart of the stem, serves as mulch for horticulture and as granulate for agro-concrete.
    Hemp concrete is a mixture of hemp, mineral binder and mixing water. This non-structural material is a very good hygro-thermal regulator, which brings both insulation and inertia to the building, it functions as a monomasse.
    Cost of hemp concrete per m² / ep200mm (excluding wood frame): € 108.00 / m²
    Its perspirancy quality or high permeability to water vapor makes it an excellent hygienic regulator. It is also a so-called "phase change" material giving off latent heats of change of state. In other words, this feature ensures optimal summer and winter comfort, without the need for electrical systems. The wall alone manages the phase shifts of temperature and humidity that the structure can experience throughout a year.

    These qualities make it a high-performance material which, far above the thresholds, meets the thermal regulations in force.

    In addition to its hygrothermal qualities, hemp concrete is a carbon sink for the structure, storing more CO2 than its life cycle emits.
    It also does not emit volatile organic compounds and thus ensures a healthy atmosphere for the user by regulating the surface moisture on the surface of the inner walls. Hemp concrete thus avoids the risk of condensation that can be observed in conventional buildings when mechanical ventilation malfunctions, for example.

    The product is under technical notice and holds its professional rules.
    The workers made the prefabrication of wood-concrete hemp panels in the workshop. They were able to appreciate the comfort of the workshop work and the speed of implementation on site.
    Hemp concrete provides significant thermal and hygroscopic comfort for its occupants.

    Lime (Hemp concrete)


    Email: [email protected]

    Second œuvre / Cloisons, isolation

    Material designed from Gypsum, significantly less energy intensive than cement for its production. Technical information is shown here:
    Cost of hemp concrete per m² / ep200mm (excluding wood frame): € 108.00 / m²

    The material meets the requirements of NF DTU 26.1.
    Workers appreciated the prefabrication of wood-concrete hemp panels in the workshop. Because of the comfort and the speed of setting up on site.
    Concrete provides a thermal and hygroscopic comfort very appreciated by the occupants.



    Tél : 02 51 36 51 51 Fax : 02 51 36 51 97

    Second œuvre / Cloisons, isolation

    This material is composed of 92% of vegetable fibers (flax, hemp and cotton) and 8% of binder.

    This material and under technical advice:
    It does not trigger skin irritation. If inhaled, the body is able to easily destroy this type of plant fibers. In fact, it is appreciated by the workers who implement it.
    It also brings a remarkable thermal and acoustic comfort within the building, thus guaranteeing a pleasant working space.
    Anecdote: The companions no longer wish to put mineral wool!

    Algo® paint


    Tél : 02 99 62 77 22

    Second œuvre / Peinture, revêtements muraux

    Technical link:
    The paint used is composed of 95% seaweed.
    Approximate price: 14.50 € ~ 18.00 € / m²

    The absence of strong odors of this painting was highly appreciated by both the workers and the users of the offices. On the other hand, its almost non-existent VOC content guarantees a healthy environment on site and in finished premises.
    Anecdote: The companions had no more headaches at night and no longer wish to pose other paintings that this one.



    Tél : 03 26 77 30 30

    Second œuvre / Revêtements de sol 

    This product consists of pine resin, wood flour (non-exotic), linseed oil, pigments and jute.
    Approximate price: 24.92 € / m²

    The components of this material provide a healthy indoor air. This type of coating is also appreciated for its speed of implementation.

    Cork panels


    Tel :

    Second œuvre / Cloisons, isolation

    Cork is a thermal and acoustic insulator. It is a rotproof biobased material.
    Approximate price: 40.26 € / m²

    This thermal and sound insulating material has been selected to isolate the slab on the ground floor.
    It is easy and quick to implement.

    Rigid wood wool panels (incorporated on prefabricated wood / hemp concrete panels)


    [email protected]

    Second œuvre / Cloisons, isolation

    Wood wool is a biobased material derived from sawmill waste.
    This insulation has been exploited as ITE and support of coatings (walls).
    Soprema® offers similar panels that benefit from technical advice, for applications on masonry and timber framing.

    This material applied as ITE provides additional insulation and eliminates almost all thermal bridges of the building. Its implementation in shop or on site remains simple and fast.

Construction and exploitation costs

  • 1 578 950,00
  • 23 000,00
  • 256 000
  • 1 620 000

GHG emissions

  • 6,10 KgCO2/m2/an
  • Our methodology respects the method developed in the context of the "Carbon Energy" experiment. The life cycle analysis was carried out on the entire project, including outdoor spaces and infrastructure. It integrates emissions

  • 819,00 KgCO2 /m2
  • 50,00 année(s)
  • 1 130,00 KgCO2 /m2
  •  the first calculations show results close to the BBCA and E2C2 levels, they require an update with new FDES, a second study is in progress

Reasons for participating in the competition(s)

​► Energy & temperate climates:

Substantial work has been done to eliminate almost all linear and integrated thermal bridges.The building has been equipped with solar panels on the roof, on a surface of 90m ². This helps to meet some of the energy needs for lighting and ATC.The lighting is provided by LED bulbs. Beyond the presence of a manual switch, their brightness varies according to the solar input in the building through a home automation system using photoresistances.The building was the subject of an RT study which revealed Cep, Bbio and Tic values ​​that fully meet the requirements of RT2012 and are considerably closer to the BEPOS requirements. It meets the Effinergie + certification, HPE standard high energy performance, three HQE targets (FlJ, QAI, STD). The building is in the process of being labeled E + C- and BBCA. It targets level 2 of the building label biosourcé.

► Low Carbon:

The building was designed in almost all of bio-based materials. The walls were made of prefabricated wood-concrete hemp panels, and their insulation further improved by the placement of wood fiber panels outside.The roof is entirely made of laminated wood and solid wood for its structure. It is insulated with hemp concrete and Biofib Trio® rolls on areas requiring special attention from an acoustic point of view.

A zinc blanket has been positioned. This material, whose properties allow for significant recycling, significantly limits the environmental impact. In fact, its use fits perfectly into a sustainable development approach.

 The partitions are insulated with rolls of Biofib Trio®, made from linen, hemp and cotton, to ensure good acoustic and thermal performance.The interior finish of all hemp concrete walls is provided by hemp lime plaster.All of the Fermacell® partitions (materials made with a significant proportion of recycled gypsum) were given an Algo Pro ® paint finish, 95% biobased.The final flooring of the floor is made of Marmoleum®, (Lino® genuine) composed of pine wood resin, linseed oil, wood flour (FSC and PEFC origin wood) and jute.The floor of the ground floor is insulated with two slabs of cork sandwiching the slab carrier.

► Health and comfort:
Perforated wooden acoustic panels are arranged in the stairwell, as well as on certain walls.
 Smoke evacuation hatches have been made in accordance to ensure a good evacuation of fumes in case of fire.Solar breezes and solar caps are equipped with a home automation system allowing the inclination of the blades for the regulation of the solar gains in the offices.
Triple glazed windows are arranged throughout the building to ensure optimal thermal and acoustic comfort in offices.
Double glazing with a large area blade for office / corridor separation is installed.
The Algo® paint used for this project has a VOC rate of 1μg / l rate. Performance well beyond the A + ranking.
The design of all the walls made of materials with a very low μ coefficient allows the diffusion of steam and thus ensures a pleasant hygrometry within the building.
Thermal and hygroscopic comfort is mainly ensured by the excellent moisture control capacity of hemp concrete.
The presence of large windows optimizes sunlight. LED bulbs with variable brightness provide lighting that meets lighting standards in offices.
Hemp concrete is a material that emits very little fumes. It limits the risk of poisoning during fires.
 Chènevotte and Biofib Trio® produce very little dust and their fibers are not irritating. However, if they were absorbed by the human body and degraded easily, the health risk for the workers working on the site is limited.
The two-stage air handling unit with a flow rate of 36m3 / h / s

Building candidate in the category

Energie & Climats Tempérés

Energie & Climats Tempérés

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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Green Solutions Awards 2018 - Bâtiments