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Client : Institut de Radioprotection et de Sûreté Nucléaire (IRSN)
Location : Le Vésinet (78),France
Project : Energy-efficient renovation by exterior
Consultants : AR ARCHITECTES
Area : 4 000m²
Cost : 800 000€ HT
Date : Laureat 2023 - Study in process

The mission for the energy-efficient renovation of the C1C2 building of the Vésinet site of the Institu de Radioprotection
et de Sûreté Nucléaire (IRSN) aims to improve the thermal comfort for its occupants during the summer and winter,
as well as to reduce the carbon footprint of the building. Energy-efficient studies have been conducted on each
façade in order to propose relevant and cost-effective thermal, architectural and environmental solutions following
the High Quality Environmental procedure HQE® : The occupants’ comfort, the economic and energy-efficient
performance, the respect towards the environment and the responsible management of the building.

Treated HQE® targets :


Target 1: Economic performance :

• This goal concerns the exterior aspect (attractiveness)
and the integration of the buildings in their environment.
The refurbishment and renovation of the existing facades
(in dire condition) allow the building to reinvent itself as
a more contemporary entity, blending perfectly with its

• The refurbishment and renovation of the exteriors also
aim to create a naturel and sober color tone of the facades.
New coatings for the window and door frames
also participate to the overall homogenization of each
and every single element of the building’s exterior visual.

• The refurbishment of the roof’s sealing also means less
maintenance for the building’s new roof. Furthermore, for
this energy-efficient renovation project, the Free-Cooling
concept is applied for the heat management of the building,
instead of energy-


Target 4: Respect towards the environment - Energy management

• The proposition for the energy-efficient renovation by
exterior insulation using wood fiber panels for the facades
suffering from overheating in summer time and
heat loss in winter time offers an excellent summer and
winter comfort to the occupants while being environmentally
friendly at the same time.

• The exterior insulation also reduces considerably thermal
heat loss during the winter and the extra layer added
to the facades reduces direct heat coming into the interior
of the building as well during summer.

• The exterior thermal insulation by wood fiber panels is
extremely environmentally friendly due to the sources
of the wood fiber panels being 80% biosourced with
materials made from natural vegetal elements. This also
means that the wood fiber panels not only stock the
carbon emissions and reduce them as well.

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