Contractor

Name : Régie Immobilière de la Ville de Paris

Contact : FrancoisJerome.LeNoel[a]rivp.fr

Construction Manager

Name : WAO

Contact : Clément DUROSELLE, clement[a]wao.paris, 01 88 32 63 34

Stakeholders

Function : Structures calculist

OTCI
Christophe LEPREUX
Structural, thermal and fluid design office

Function : Company

CARE BTP
Jonathan RENAUX
Group of companies in charge of the realization of all the lots

Function : Environmental consultancy

RISK CONROLE
Georges WEHBE
Technical control office

Function : Environmental consultancy

QUALICONSULT
Dominique LAROCHE
Safety and Health Protection Coordination

Function : Site manager

TELA 13
Muriel CLEREL
Future users of the place

Contracting method

General Contractor

Systems

Heating system :
• Heat pump
Hot water system :
• Individual electric boiler
Cooling system :
• Reversible heat pump

Urban environment

The project is located in the Olympiades district, Paris 13th, built in the mid-1970s by architect Michel Holley. It represents a rare example in Paris of Dalle town planning, driven by modern thinking. The "rue du Javelot", which gives its name to the project, is in fact never visible, located under the project and disappears into the slab. The district is also very particular within the capital in terms of its architectural diversity and the many modernist achievements it presents.

Despite their historical quality, large housing estates are often decried, in particular by the omnipresence of concrete and the loss of the human scale. The "rue du Javelot" renovation project thus seeks to contrast with this mineral urban context through the use of a visible bio-sourced material and the detail of a non-standard slatted cladding.

Land plot area

Land plot area : 7 981,00 m²

Built-up area

Built-up area : 2,40 %

Building Environmental Quality

Reuse : same function or different function

Batches concerned by reuse :
• Facades
• Locksmithing-Metalwork
• Outdoor joineries
• Partitions

For each batch : Reused Materials / Products / Equipments :

• Facade insulating glass frames: 34 m²
• Softwood flooring: 1088 mL
• Curved steel roof frames: 7 units

Field of use and material origin :

• Insulating glazed facade frames reused on site as interior glazed partitions,
• Resinous wood parquet from a Parisian site transformed into facade cladding and filling of railings,
• Curved steel roof frames suitable for integration of new insulating glazing.

Sustainable design

Reusable materials :

• Insulating glazed facade frames reused on site as interior glazed partitions:
  
  
  
• Resinous wood parquet from a Parisian site transformed into facade cladding and filling of railings:
  
  
  
• Metal staircase given for reassembly and reuse ex-situ:
  
  
  
• Curved steel roof frames suitable for integration of new insulating glazing:
  
  
  

Reversibility / Adaptibility :

From the outset, this building on slab was thought to be reversible. It has a free structural plan, consisting of six posts, containing the downspouts, carrying the floor beams and peripheral brackets. This offers perfect adaptability of facades and interior fillings.

The renovation project wanted to take this fact into account by implementing a reversible facade filling thanks to the use of a wood frame construction system and cladding.

Specificities linked to new materials :

All the facades created were made of wooden frame walls covered with cladding. (The cladding is replaced at the limit of thirds by coated mineral panels in order to guarantee regulatory fire resistance).

Environmental assessment

Impacts avoided : water, waste, CO2 :



The reuse operation saved the equivalent of 30,154 kilometers traveled by a small car, or 34 Paris-Nice, 6,202 rectangular bathtubs filled with water and 5 years of household waste for a Frenchman.

Reproductibility and Innovation

In order for the re-employment to be understood as a fundamental data of the project, it has been integrated into the base in the consultation file of the companies. The latter nevertheless had the right to cost solutions in new materials but in the form of an option.

The CCTP described in great detail the materials that could be reused on site, invited companies to offer external deposits at their disposal, and detailed a methodology to remove existing structures for IN or EX Situ re-use.

• Ephemeral and transitional programming:
  In the interstice between the end of studies and the start of construction, the project site has become an ephemeral exhibition space. To do so, a temporary occupancy agreement was developed with the lawyers of the RIVP and signed with the two artists. In the context of dense cities such as Paris, we believe that this question of transitional programming should be generalized to renovation projects.

 

• Facade insulating glass frames
  The difficulty in using insulating glazing indoors was to know their structural performance and their rebate dimension. The control office required the presentation of a technical sheet to accept this reuse. Fortunately, by studying the glazing precisely and deciphering the glazing insert, we were able to identify the original supplier (RIOU GLASS) and obtain from them a composition document giving a technical sheet.
  
• Softwood parquet:
  In the current normative context, it is often complex to implement reused materials without being able to qualify their technical performance. This is all the more true for the structural elements and those participating in the enclosure of the building. As part of the Javelin project, a long discussion took place with the Technical Controller to allow the use of an old parquet floor (without technical data sheet) as cladding for the openwork facade. Its use was made possible thanks to three arguments: it does not participate in the sealing of the building (and a UV-resistant rain barrier is put in place); its thickness is more than 20mm; it is largely protected (ratio greater than 1/2.5) thanks to roof overhangs.



• Metal staircase:
  The implementation of circular dynamics requires studying the regulatory, legal and administrative constraints. Thus, with the participation of RIVP lawyers, a donation agreement was drawn up so that the metal staircase could be transferred to individuals for EX Situ reassembly.

Link between demolition and all trades work :

The CARE BTP company has the particularity of describing itself as: masons, carpenters and demolishers.

Thus, based on the recommendations of the CCTP and in dialogue with the MOE and the CSPS, the company proposed an effective methodology to take into account the need to carefully remove the works, to condition some of them for external reuse, and to organize on-site storage areas, moving according to the construction phases.

1 metal staircase was thus donated for ex-situ reassembly and reuse,

Economic assessment

• Total cost of reuse : 98 216 €
• Cost of reuse in percentage of the operation : 10 %
• Saving realised thanks to the implementation of reused materials compared to new materials : -35 000 €