Contractor

Name : EVESA

Contact : Frederic GALLOO

Construction Manager

Name : Si Architectes

Contact : Florian BOSC MALAVERGNE

Stakeholders

Function : Designer

Florian BOSC MALAVERGNE
Florian BOSC MALAVERGNE

Function : Designer

Damien BOBOC
Damien BOBOC

Function : Thermal consultancy agency

SOLENER
Arnaud FAVAREL

Function : Structures calculist

Atelier MASSE
Raphaël FABBRI

Function : Other consultancy agency

OXYNERGY
Pascal BACH

Function : Company

BOUYGUES ENERGIES SERVICES
Alain CASULE

Function : Company

SITCF
Anthony DECAMPOS

Function : Company

ENERGIES SB
Philippe HOCHART

Function : Company

SERRES ANCIENNES
Guillaume DUROST

Function : Company

Bouygues Energies Services
Kevin Dy

Contracting method

Macro packages

Energy consumption

• Primary energy need : 99,85 kWhep/m².an
• Primary energy need for standard building : 50,00 kWhep/m².an

Calculation method : RT 2012

CEEB : -0

• Initial consumption : 250,70 kWhep/m².an

Systems

Heating system :
• Gas boiler
Hot water system :
• Individual electric boiler
Cooling system :
• No cooling system
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• Solar photovoltaic
• Renewable energy production : 3,08 %

The technical terrace located in R+7 has been equipped with a fleet of 45 photovoltaic panels with a total power of 19.84 kWp. The production is distributed in the building and consumed instantaneously.

Smart Building

BMS :

The BMS installed in the building contains the following information:
- Monitoring of electricity consumption by floor ;
- Monitoring of water consumption by floor ;
- Weather monitoring ;
- Monitoring of boiler production ;
- CTA operating status.

Construction and exploitation costs

• Total cost of the building : 6 547 000 €

Urban environment

In the dense urban environment of the Montparnasse district in Paris, the renovation of the building has restored all its brilliance to the facade, decayed by time, which dialogues again with the other buildings of the 1930s. The agricultural greenhouse installed on the roof is integrated into the shades of gray of traditional zinc roofing with its galvanized steel structure.

Building Environmental Quality

Reuse : same function or different function

Batches concerned by reuse :
• Outdoor joineries
• Floorings
• Suspended ceilings
• Electricity
• Plumbing

For each batch : Reused Materials / Products / Equipments :

Exterior metal joinery:

• Openable carpentry making up the running strips of the R+2 level - 43m² - 40 units - in-situ

False ceilings :

• Slabs reused in-situ - 980m²
• Reuse slabs - 1000m² - from another company removal site

Floors:

• Parquet floors - 150m² - in-situ
• Carpet - 30m² - company unused stock

Exterior floors:

• Protective gravel for technical flat roofs - 7m3 - in-situ

Plumbing:

• PVC tube (EU) - 35ml - company unused stock

Electricity :

• Downlight luminaires - 71 units - in-situ
• LED tiles - 247 units - in-situ
• Exterior wall lights - 7 units - in-situ
• Fluorescent tubes - 126 units - POLIX lamps - Maximum Design

Sustainable design

Reusable materials :

Steel windows

The building before renovation included different types of exterior joinery, sometimes transformed without regard to their design or their original materials. The project providing for the thermal standards of the joinery, all the existing windows had to be removed.

At the R+2 level, a continuous band composed of fixed and opening bays was identified as a deposit from the beginning of the project. Made up of T-shaped or L-shaped steel sections , these elements had the advantage of repeating the same dimensional module . This regularity made it possible to envisage a series reuse taking up all the joinery.

The project included the landscaping of the roof terrace on the 6th floor. During the preliminary design phases, discussions with the Client led to a proposal to build an agricultural greenhouse incorporating reused carpentry from the existing building.

The "test" removal operations initiated at the start of the construction site led to the abandonment of the reuse of the fixed parts, which were too fragile. The frames firmly anchored in the rebate in the concrete facades requiring a muscular removal to be extracted invariably emerged deformed from the removal.

The series of openings could be fully recovered. It was treated in the workshop by the company Serres-Anciennes, in charge of the construction of the agricultural greenhouse. The joinery has been sandblasted, galvanized, new compliant glass has been reassembled, and it has been integrated into the structure of the agricultural greenhouse built on the roof.

The entire design of the agricultural greenhouse takes into account the recovered windows, both in terms of geometry and in terms of systems. Put back into play in this new work, the windows fulfill their function of ventilation and anchor this new construction in the history of the building.





 

Parquet

The disparate floor coverings in the existing building were subject to local renovations. On the 6th floor, the importance of the renovation called for a complete removal of the floors. A relatively new parquet floor in good condition occupied most of the surface. Despite its average aesthetic appearance and given the objective of circular economy, it was decided to keep it.

The first removal attempts were inconclusive, the company struggling to remove the blades without damaging them. By insisting, it has redoubled its efforts to determine the right gestures and deposit almost the entire surface of the parquet floor without generating any loss . The slats have been stored on pallets on the same floor as their removal to avoid unnecessary handling.

All of the recovered slats were thus reinstalled at the end of the work.

 



 

Suspended ceiling and suspended ceiling luminaires

As part of the renovation work and in particular the installation of ventilation (double-flow CTA), the installation of the ventilation and electrical networks required the removal of the existing false ceilings. The high dismantling and modularity of the constituent elements (slabs and ceiling lights) have allowed significant reuse . Damaged tiles and obsolete electrical equipment have been replaced. However, the company took advantage of a parallel project to provide a second deposit of false ceiling slabs, making it possible to further increase the rate of reuse.

Functionality economy, recycled and recyclable materials :

• Recycled cotton insulation from used clothing - METISSE Le Relais
• Natural lineoleum floors including fragments of cocoa pods - FORBO Cocoa
• Recycled waterproofing membrane - DERBIGUM NT
• Incompressible thermal insulation made of recycled cellular glass - FOAMGLASS
• POLIX lights - MAXIMUM
• Mineral-bound resurfacing paint (devoid of petroleum chemistry) - KEIM

Environmental assessment

Impacts avoided : water, waste, CO2 :

Waste : 194 tons of which 94.7 tons were recovered or reused (Tricycle Environnement).

Asbestos : 30m3 of asbestos waste recycled by inerting (vitrification by Intertam). This is the only way to avoid landfill and to guarantee the safety of the residue. The vitrificate obtained (Cofalit) is used as a road surfacing underlay, but many other uses are being studied.

Categories	Avoided CO2 (kg)	Avoided water consumption (m3)	Avoided waste (kg)
Outdoor facilities	758.87665	7.615624425	1062.454084
Exterior fittings / Locksmithing - Metalwork	0	0	0
Carpentry	0	0	0
Partitions	0	0	0
Coverage	0	0	0
Roofing / Exterior fittings	14.322	0.1666455	771.7832388
Lighting	35654.18594	182.3319846	33899.91834
Safety lights	0	0	0
Climatic engineering equipment	0	0	0
Electrical equipment	0	0	0
Facades	0	0	0
False ceilings	9211.653825	94.392628	16385.14013
False floors	0	0	0
False ceilings	0	0	0
Structural work	0	0	0
Sanitary installations	0	0	0
Insulation	0	0	0
Exterior carpentry	5234.175	51.7419	3881.482903
Interior carpentry	0	0	0
Furniture	0	0	0
Paint	0	0	0
Plumbing	0	0	0
Floor coverings	990.4555122	26.97398957	605.55344
Floor and wall coverings	0	0	0
Wall coverings	0	0	0
Building security	0	0	0
Locksmithing - metalwork	0	0	0
VRD	0	0	0
TOTAL	Avoided CO2 (kg)	Avoided water consumption (m3)	Avoided waste (kg)
	51863.66893	363.2227721	56606.33214
	Km in a small car	Nb of rectangular bathtubs	nb of years of household waste of a French person
	414909	2421	113

 

Equivalent trajet Paris- Nice

471.0

 


The re-use operation saved the equivalent of 414909 kilometers driven by a small car, or 471 trips from Paris to Nice, 2421 rectangular bathtubs filled with water and 113 years of household waste of a French person.

Reproductibility and Innovation

The replicability of the operation depends on the commitment of all project stakeholders. This evidence, already underlined in the case of project management in general, is all the more important when a reuse strategy must be put in place.

In fact, each of the participants must be able to adapt their methods in order to materialize the opportunities for re-employment . Without the will of the contracting authority, the project management can hardly carry out the approach alone. Throughout the project, it is the control office and then the companies who must then commit to adopting an open and proactive approach .

As part of the renovation of the Bourdelle building, the meeting between the company EVESA, keen to promote a virtuous approach to the circular economy, and the Collectif Si Architectes, project managers who have been experimenting with reuse strategies for several years, made it possible to carry out the project.

The architects then declined this strategy into different objectives, carried out educational work vis-à-vis the technical stakeholders throughout the project. When technical or administrative blockages were encountered, it was also the architects who sought solutions (laboratory tests, understanding of standards, technical modifications, identification of recycling/reuse channels, etc.).

The main innovations are not of an architectural or technical nature but relate to the progress of the project. When reuse is practiced on a project, it is necessary to carry out test sites upstream of the site itself. This implies the increased intervention of the control office but also that of a construction company to carry them out. In the private market, this early recourse to a company is easier than in the public market. However, it remains difficult to mobilize a company upstream of the construction site, on small structures, without the assurance that it will obtain the site mission. Control offices are also partners whose involvement must be reconsidered.

Link between demolition and all trades work :

The cleaning works were carried out by the company TRICYCLE Env. which acted as a subcontractor for the general contractor in order to meet market requirements.

Storage of dismantled materials and management in situ reused materials :

The reused materials followed three different paths depending on their nature:

• materials that do not require any special treatment before refitting (false ceiling tiles, parquet floors, etc.) were stored on site ;
• the materials subject to special treatment before refitting (steel windows of the agricultural greenhouse) were treated in the workshops of specialized companies ;
• materials that cannot be re-used in-situ have been stored by the company responsible for cleaning, which is also responsible for their re-marketing.

 

Exterior woodwork:

• Wooden sash windows - 38 units - to reuse construction specialist

 

Plumbing:

• Sanitary equipment - 900kg - to Tricycle Environnement reuse platform

 

Exterior floors:

• Gravelled slabs - 18.2t - to Tricycle Environnement recycling platform

Social economy

Social economy and professional integration :

• TRICYCLE ENVIRONMENT: 11 employees in professional integration
• METISSE LE RELAIS: all company profits are reinvested in the creation of sustainable jobs.