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ArcelorMittal steel transforms the apartment tower Bois-le-Prêtre in Paris
This social housing high rise building in the 17th Arrondissement of Paris dates back to the early 1960ies and has not only been renovated and rehabilitated but also completely redesigned according to modern housing standards. Balconies and winter gardens were added on all four sides to increase the size of the apartments and ArcelorMittal's metallic coated steel was used for the new façade.
Rehabilitation and transformation project for social housing
The 50 m tower with a total of 96 social housing units distributed on 16 floors was built in 1962. Due to the fact that over the years the building had become obsolete regarding technical issues as well as living conditions, the owner of the building, Paris Habitat, considered a complete demolition in 2006.
But this plan was abandoned in favour of an exhaustive transformation project that included an expansion of the apartments by the expansion of the floor construction on all four sides of the tower.
This way, the space in the living rooms could be increased, winter gardens and balconies were created, and surface was gained.
Thanks to these measures, living comfort, natural light and the view from the apartments could be improved, and energy consumption (especially for heating) could be reduced significantly.
The unique aspect of this transformation project was the fact that the residents could actually stay inside the building while the construction works were going on.
The Parisian architects Frédéric Druot, Anne Lacaton and Jean Philippe Vassal developed the plan for this rehabilitation and transformation project.
The project was already started quite a long time ago, in 2005, but all the involved parties agreed that it was worth the time – since it was conducted in collaboration with the residents and concerned a long-term improvement of the living conditions.
Steps & results of the rehabilitation and transformation project
- Reconfiguration of the lobby: it was set on street level
- Installation of two new elevators to facilitate people flow on all floors
- On the floors, additional space was created for larger living rooms and kitchens or additional bedrooms and bathrooms. In total, 3500 additional m2 could be gained.
- The highlight nonetheless was the creation of glazed winter gardens and balconies on the east and west façade. With the dimensions of 2 m long and 1 m wide, they permit natural light to enter the apartment.
- 4 new apartments could be created
- 7 different types of apartments (instead of 3 different types before the transformation) for families of different sizes.
- Additionally to the thermal insulation, the new façade and winter gardens also protect the building from outside noise (coming from Ring road)
Although the residents will experience a slight increase of the rent in the next years, this cost will be compensated by the 50% reduction of energy consumption.
Use of metallic coated steel
ArcelorMittal's metallic coated steel played an important role in the new aesthetics of this housing tower, in the interior as well as exterior. In the interior, the same material was used for the ceilings of the winter gardens and partition walls.
Thanks to the high light reflectivity of this metallic coating, the Tour Bois le Prêtre glistens in the sunlight and makes it stand out from its surroundings. The silver-metallic sparkle will be maintained for a long time thanks to the thin layer of aluminium oxide on the surface of the coating.
This steel also contributes to the fire protection of the steel columns in the exterior – it was used for the outer skin of the column envelope, with a mineral wool insulation core guaranteeing a protection REI 90 minutes: The solution employed is based on the innovative firestop solution patented by ArcelorMittal and developed in collaboration with the company SDI (Synergy and Industrial Development) located in Lorraine.
Frédéric Druot Architecture
LACATON & VASSAL Architectes
- 2006 - 2010
- Engineering Firm :
SDI (Synergie et Développement Industriel)
Frédéric Druot & Philippe Ruault