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Created in 1970, in the heart of the city of Saint-Nazaire, the IUT today hosts the training of 6 departments, on the Heinlex university site (Campus Pôle Sciences et Technologies). In a desire to be part of the city, the project promises to offer a new space for use. Spread over 3 buildings, the Heinlex campus restructuring project is distinguished by two projects:

The construction of a new building

In the immediate vicinity of the pedestrian link to Charpack Boulevard (a major axis in Nazaire), this new space will house a university library as well as coworking spaces on the first floor and practical work rooms on the upper floors.

The rehabilitation of two buildings

- Building 7, the university's reception and administration building, will undergo a major renovation with the creation of a new wood-frame floor. A duplex hall will be created as well as informal work spaces.
- The light rehabilitation of building n°8 will consist of the refurbishment and embellishment of the interior premises, the removal of asbestos from the floors and the replacement of the electrical installations.

A project with environmental requirements

To reduce the carbon footprint of the project, the design and build consortium designed a project that combines:

- The compactness of the building: the amount of material used in the construction is optimized and reduced thanks to the building's compactness;
- The off-site construction of the wooden elevation, the floors and the prefabricated walls: the prefabrication of these elements allows a perfect management of the materials used, an ease of implementation and a reduction of the time of building site. The construction site is also cleaner thanks to the reduction of waste and nuisances;
- The use of biosourced materials in large quantities: it was also chosen to work with local companies to boost the territory. The BioFib' Trio insulation (made from hemp, flax and cotton) is produced in the Vendée region and the Algo biosourced paints are produced in Rennes. In addition, 100% of the wood used on the site comes from the "Bois de France" brand (use of CLT wood flooring and 100% wood frames);
- The choice of a strategy for reusing materials: in situ or ex situ.

The high thermal performance of the buildings is made possible by a high-performance bioclimatic envelope: the insulation is done from the inside, the solar protections are mobile and the joineries are high-performance, which results in good thermal inertia.
In addition, all the materials used, stable and durable over time (concrete, wood and glass) will guarantee a life span of over 50 years.

The combination of these elements makes it possible to meet strong environmental requirements and thus achieve the following objectives:

- The new building is certified HQE Bâtiment Durable 2016, BBC Effinergie 2017 and E+C- level E2C1. Level 2 of the Biosourced Building label is also achieved with 31kg of biosourced materials incorporated per m² of floor area. This building also obtained the BBCA (Bâtiment Bas Carbone) label: it is the first educational building to obtain this certification within the scope of Bouygues Bâtiment Grand Ouest.
- The renovated buildings have been awarded BBC Rénovation certification.

Support for users

Student support is a key point in the project, and was included by the project owner as a rule in its specifications. The civil engineering course, which trains the construction engineers of tomorrow, is present on the Heinlex campus of the IUT of Saint-Nazaire. As such, the support of the sector and its students seems to be an obvious choice. The program includes educational visits to the site, support for work teams on projects or materials, internship offers, work-study contracts, etc.

Project schedule

Organized as a drawer operation and on an occupied site, the total duration of the work is planned for 34 months, including the design phase. The construction site will begin after the summer of 2022 with the construction of the new building.  All 3 buildings will be delivered in the fall of 2024.

The actors of the project
Owner : Carène and Sonadev
Client: Nantes University
Contractor of the design and build consortium: Bouygues Bâtiment Grand Ouest
Architect: AIA Architects
Other members of the consortium: AIA Ingénierie, AIA Environnement, GAMBA, Namixis, Fondasol, GINGER and Equans
Project value: €10 million
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