Contractor

Name : Collège Notre-Dame de Bon Secours ASBL

Contact : Mme Maggiordomo Directrice - [email protected]

 https://www.cndbs-binche.be/

Construction Manager

Name : DE GRAEVE SA

Contact : Olivier Mareschal Administrateur délégué ([email protected]) - Marc Vermaere – Conducteur chantier ([email protected])

 http://eiffagebenelux.com/fr/societe/de-graeve

Stakeholders

Function : Designer

AAIA - Atelier Alter Ingénieurs et Architectes

Christophe Lootvoet - [email protected]

 http://www.aaia.be/

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Function : Environmental consultancy

EURECA et A+ Concept

Matthieu Bourgeois - [email protected]

 http://eureca-net.be/


Economy and rational use of energy, advice and support

Contracting method

General Contractor

https://www.construction21.org/belgique/data/sources/users/1917/gdg-ca-eblx-29-mars-20181.pptx

Owner approach of sustainability

For several years, the College "Notre-Dame of Bon Secours" of Binche is invested
in the sustainable development, with an "Eco-Team" which carries out several projects to make the students aware of the environment and the eco-citizenship. In order to be in full coherence
with the pedagogy applied in the establishment, the direction of the college wanted

• to set an example for future adults by choosing a positive construction with materials predominantly of plant origin;
• provide students and teachers with a healthy work environment.

Also in 2014, after a long reflection and many research, and after being surrounded by "specialists", the management has launched a passive building project built with materials mainly of plant origin, which is a first in Belgium.The construction system combines three renewable materials with timber, straw for insulation, earth with cork on the roof and clay plaster for interior cladding.
"We wanted to make the values ​​of our Eco-Team a strong gesture," says Teresa Maggiordomo, director of the school. The board quickly approved the project, the expense being not much higher than a more traditional solution. "We are at 1250 € / m² gross, which remains competitive," says Jean-Michel de Marchi, deputy director.The first building has eight classes, the second building five classrooms, a laboratory and sanitary facilities. However, the client had to show determination because he had to overcome many obstacles:

• the legend of the three little pigs and the prejudices related to it are still very much present in the collective unconscious; straw construction is still too much considered today as an alternative or even marginal vision of the possibilities of building;
•  to find the architect with a large A was not easy;
•  building a straw is still a pioneering process that does not allow to rely on the experience of other institutions;
•  the cumbersome and sluggishness of all the administrative procedures has slowed the realization: "we encourage us to engage in passive or positive constructions but no administrative or financial support is offered", Teresa Maggiordomo laments

Architectural description

Since start of All Saints' Day 2017, 5th and 6th grade students at the" Notre-Dame de Bon Secours" secondary school in Binche are the first in Belgium to take classes in a building isolated from straw and timber framing. A spacious, bright, and healthy pavilion has replaced a prefabricated sheet metal energy wastage. This pavilion is the first prefabricated school building made of wood, compressed straw and clay plaster in French-speaking Belgium.

This construction technique offers many advantages. The structural work consists exclusively of wood, straw and earth, which is renewable materials. The other materials are as natural as possible: the new pavilion has no concrete slab for example, but a cork insulation and a dry screed.

" We value environmentally friendly, unprocessed and healthy materials, thus ensuring recyclability of the building ", explains Christophe Lootvoet, architect of the project. While construction waste is being upgraded at a high cost, the pavilion can be almost completely compostable if it ever needs to be dismantled.

Second advantage: the exemplary carbon footprint. " To build a conventional passive building, a C02 peak is produced before and during construction " due in particular to the use of petrochemical materials. " We are storing CO2, which is much more interesting, " continues Christophe Lootvoet. Because being of vegetable origin, the wood and the straw are fixers of CO2 and make it possible to reach a negative carbon balance.

Third advantage of natural materials: indoor pollution is avoided. " Endocrine disruptors are present in a lot of materials. Even if they meet the standards, when you accumulate phthalates that release vinyls, paintings on the walls and ceiling, you do not live in a healthy environment . "

Another advantage: humidity is regulated by the clay coating on the walls. " With walls covered with plaster and latex paint, the humidity of the air varies greatly with condensation problems in the key. Here, we are dealing with a large exchange surface material, full of micropores, which allows a very constant humidity level. "

The project began in June 2017. The panels were transported from the workshops of the Paille-Tech cooperative to Franière (Floreffe), and assembled in Binche. " We used techniques from self-construction, with all the alternative aspect that implies, " says Antoine Bonnert, manager of Paille-Tech.

Energy consumption

• Primary energy need : 74,00 kWhep/m².an
• Primary energy need for standard building : 125,00 kWhep/m².an

Calculation method : Other

• Final Energy : 125,00 kWhef/m².an
Breakdown for energy consumption :

Heating are 37 kWh / m².an

More information :

Net energy requirements heating are 37 kWh / m².year instead of 70 to 80 kWh / m².year as standard. (compared to the low energy which is 30 kWh / m².an or the passive which is 15 kWh / m².an).
51 403 kWhep / year are saved between the building situation and the reference value, ie 81.28 kWhep / m².year of savings compared to the reference value.

Real final energy consumption

Year of the real energy consumption : 2 019

Envelope performance

• Envelope U-Value : 0,12 W.m^-2.K^-1
More information :

High performance insulation
U = 0.12 W / m2 ° K (passive)
It is a passive building.

• Building Compactness Coefficient : 0,40

Indicator : EN 13829 - n50 » (en 1/h-1)

• Air Tightness Value : 0,51

Users' control system opinion :

Not applicable.

Systems

Heating system :
• Condensing gas boiler
Hot water system :
• Gas boiler
Cooling system :
• No cooling system
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• No renewable energy systems
 0
Other information on HVAC :

Nothing in particular

Solutions enhancing nature free gains :

Nothing in particular

Smart Building

BMS :

Not applicable

Users’ opinion on the Smart Building functions :

Not applicable

Urban environment

The city of Binche has +/- 33,575 inhabitants. Former mining and textile town, Binche is world famous for its architectural heritage and its Carnival. The school and its surroundings (lawn, playground) are located in the city center. The city is well served by public transport (Train, bus ...).

• Land plot area : 5 000,00 m²
• Built-up area : 20,00 %
• Green space : 4 000,00

Product

Insulation of straw and clay walls



Pailletech

Paille-Tech scrl Rue de la Glacerie, 6 B-5150 Franière Belgique Tél : +32.(0)81.44.07.39 TVA : BE 0820.755.996

 http://www.pailletech.be/


Product category : Structural work / Passive system

Constructive system that uses straw as insulation and clay plaster for interior lining.

Straw construction is still too much considered today as an alternative or even marginal vision of the possibilities of building, but the contracting authoritiy managed to convince.

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Expanded cork



Qualicork

[email protected]

 http://www.qualycork.be


Product category : Finishing work / Partitions, insulation

Use for the floor and roof of cork and rubber.

No specific problem. High performance insulation: U = 0.13 W / m2K

Construction and exploitation costs

• Total cost of the building : 1 288 026 €

Comfort

Health & comfort :

Ultra perform insulation : U=0,13 W/m2K

Calculated indoor CO2 concentration :

pas d'information

Measured indoor CO2 concentration :

pas d'information

Calculated thermal comfort : pas d'information

Measured thermal comfort : pas d'information

Acoustic comfort :

No values ​​measured to date.

GHG emissions

• GHG in use : 22,75 KgCO₂/m²/an
Methodology used :

Calculation method according to Appendix D of the AGW May 8, 2014

• Building lifetime : 100,00 an(s)

Appendix D of AGW, May 8, 2014