Orée 85 associative building

  • Building Type : Isolated or semi-detached house
  • Construction Year : 1870
  • Delivery year : 2022
  • Address 1 - street : 32 Impasse de l'Écluse 67200 STRASBOURG, France
  • Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.

  • Net Floor Area : 84 m2
  • Construction/refurbishment cost : 110 000 €
  • Cost/m2 : 1309.52 €/m2
  • Primary energy need :
    (Calculation method : )
Energy consumption
Economical buildingBuilding
< 50A
51 à 90B
91 à 150C
151 à 230D
231 à 330E
331 à 450F
> 450G
Energy-intensive building

L'Orée 85 is a place of life and experimentation dedicated to the meeting between the public and to societal and environmental transitions, through a sustainable restaurant-café-bar, an educational garden and a cultural program.

Winner of a call for occupation of the fluvial area launched by Voies Naviguables de France (VNF), the project was born in the old lock house No. 85, along the Rhône-Rhine canal, on the initiative of three friends: Lola Bertrand, Manon Cordier and Maxime Billmann. From the first reflections, a point of honor was made to develop all aspects of the project with the greatest respect for the principle of sustainability , in accordance with the personal values of the three founding members and the logic of social economy. and solidarity in which the cultural third place, now constituted as a SCIC, is deeply inscribed.

From a planning and construction point of view, the in-house team has made second-hand and re-use automatic. As a private group, it is their convictions that have led them to use reuse as a priority as sources of materials: conservation of existing elements and reuse in situ. For the other elements, they have systematically chosen biosourced.

The house, whose atmosphere mixes Greece and holidays by the sea, is entirely furnished using second-hand furniture unearthed by browsing the classified ads, garage sales and consignment sales in the region: from the shell chandelier, to the amphora through the toilet paper dispenser with fish motifs. When the materials are not reused, they are almost all bio-sourced : tiles, fabrics, solid oak parquet, seagrass, wood wool, cob, or even lime.

Key local partners in sustainable housing and the circular economy were integrated into the project from the outset. Together with the BOMA Les BOnnes MAtières circular economy design office, a major regional player in reuse in the construction sector , a diagnosis of needs was first carried out and updated throughout the project, then a on the sourcing and on its routing on site of a maximum of materials coming from deconstruction sites was carried out: railings of stairs of wooden building reused in fence, bench and shelves; a reused metal staircase; cellar trellises reused as cleats; double-glazed window panes from a building reused as glazed veranda roofs or even office doors reused to make a chicken coop. As for the Atelier NA, a collective of architects working for inclusive construction , it fed the operational dimension of the reuse/reuse of the project while helping to make many aspects of this site participatory. The construction of a reused summer bar from the wire netting deposited in situ, the manufacture of wood and wicker structures with rounded shapes to receive the cob then the lime and the manufacture of a reused chicken coop from doors, have allowed the inhabitants of Strasbourg to appropriate the space by participating in its sustainable construction.

Several companies and craftsmen also participated in fully integrating the suggested principles into their approach, more or less present in their basic values: the carpentry and eco-construction company Hylê carried out the carpentry work on the terrace and the veranda with exclusively local wood (Douglas fir from the Vosges); the company Technopieux prepared the foundations of the aforementioned construction elements from piles screwed into the ground, thus avoiding concrete foundations; the locksmith-metalwork company La Forgerie built the frames to receive the reuse glazing; and the low-tech construction association Lowarchitech accompanied us on the implementation of the wickerwork, cob and lime work sites.

Building users opinion

At the opening night on Saturday, May 14th, descriptions of the place and the energy that emanates from it varied between vacation home, campsite, Woodstock. So many terms that suggest a feeling of well-being!

Below are some testimonials and comments from different people about the project:

“The worksites allow you to meet people and the atmosphere is really cool. There is a real collaboration behind it and they do this with everyone and for everyone. There's a satisfying side to seeing the place now and imagining the end result. I can't wait to come back to the opening and to be able to tell myself that I've put a little piece of land here." - Charlie, volunteer on the participatory sites

“Thank you for your admirable commitment to bringing this beautiful place back to life! » - Pierre Jakubowicz, city councilor, vice-president of the Tourist Office of Strasbourg and its Region

“This is the type of project where there is heart and investment. It is a human approach carried by a team with which one can easily identify. The out-of-town side of the site, this in-between, is quite atypical as a location. It really makes me want to visit him. - Aurélien, volunteer on the participatory worksites

“You feel like you've escaped the city even though you're 10 minutes from the centre. - Christiane, visiting cyclist

" Tremendous ! Delighted with the prospect of being able to bond with people as diverse as they are unknown in this magical place. I imagine - perhaps a little too quickly - bicycles, canoes and great games of tarot to change the world… And then the day when we can swim back… what a party! - Anonymous comment on a press article (Rue89 Strasbourg)

"The way you view people in this place does a lot of good." - Danny, volunteer in the garden via the La Cloche network which fights against the exclusion of homeless people

If you had to do it again?

- The square glazing which had to be reassembled on frames to become front windows of the veranda could not be reused. This implementation required the installation of non-conventional frames, which would have delayed the site by more than 6 months, which was impossible on a 4-month site. - Double PVC window door: was planned to become the main access door to Orée 85. The technical characteristics of the product did not allow PRM access to the site. Indeed, the entry threshold would have been greater than 2 cm. The window door could therefore not be used on the site. - Exterior galvanized staircase: during the implementation of the staircase, we realized that the 2 stringers were not the same size, and that the fixing bolts of the stringers provided were not suitable. We therefore had to make a wooden connection to make up for the too short stringer, and to buy threaded rods adapted to the staircase. This caused an additional installation delay, but the schedule was nevertheless respected, and the staircase could be installed according to the rules of the art. > make a more precise statement upstream of the elements to be reused, before transport to the site > be flexible on the site, and plan for contingencies in the schedule

See more details about this project


Photo credit

Orée 85 for all except the photo of the outdoor bar (Abdesslam Mirdass)

(Other photos are scattered on the other tabs, for lack of space here)


    Orée 85

    Maxime Billmann - maxime[a]oree85.org

Construction Manager

    Joachim Boyries

    Joachim Boyries - joachim.boyries[a]wanadoo.fr


    Other consultancy agency

    BOMA Les BOnnes MAtières


    AMOE circular economy in the building sector / Sourcing of reused materials, legal and logistical support


    Atelier NA


    User control assistant and supervisor at participatory workshops / Realization of an outdoor summer bar and a reused chicken coop / Realization of a cob participatory site


    Hylê éco-construction

    Samuel Laporte - hyle.be[a]ecomail.fr

    Framework / Manufacture and implementation of the terrace and the veranda



    Maurine Koeberle - maurine.koeberle[a]lowarchitech.com

    Assistance in the realization of an interior cladding in cob and lime plaster



    Guillaume Mongin - guillaume.mongin[a]technopieux.fr

    Manufacture and installation of foundation piles


    La Forgerie

    Julien Giraud - contact[a]la-forgerie.com

    Locksmith-Metalwork / Installation of the metal structure and reused glazing of the veranda / Manufacture and installation of galvanized steel railings and a raw steel bar sky

    Other consultancy agency


    Adèle DEBONNET - adele.debonnet[a]fondasol.fr

    Realization of a soil study



    Monsieur NASS - Nass_67800[a]yahoo.fr

    Opening of bay and load-bearing wall / Structural reinforcement / Partitioning / Painting / Tiling / Implementation of the reused window door


    Electricité DNR

    Mehmet YIGIT - electricite.dnr[a]gmail.com

    General electrical installation



    Julien PAULUS - julien.paulus[a]ets-dollinger.fr

    Rehabilitation of existing sanitary and heating networks / Implementation of reused earthenware (WC)


    Menuiserie SENGLER

    Thomas RISCH - thomas.menuiseriesengler[a]gmail.com

    Manufacture and installation of French doors, windows, interior doors / Supply of solid and laminated wood worktops



    Pierre MUNAR - pierre[a]techdesbrasseurs.fr

    Supply and installation of kitchen and bar equipment / Installation of a reused 3-door fridge


    KSF Gastro

    Ahmet ORHAN - ksfgastro[a]gmail.com

    Supply and installation of a hood



    Romain Linkenheld - r.linkenheld[a]groupe-altair.org

    Delivery of reused materials to the site

Contracting method

Separate batches

Envelope performance

More information

The energy diagnosis carried out does not make it possible to precisely fill in this information. No thermal study has been carried out for the project. As the project has not yet been completed, no consumption data is available.


    • Individual gas boiler
    • Water radiator
    • Individual electric boiler
    • No cooling system
    • Single flow
    • Other, specify

    La véranda ayant été placée au sud ouest, elle apportera des apports en chaleur solaire en hiver et demi-saisons. Un système de sur-ventilation est installé pour annuler ces apports en périodes estivale.

Biodiversity approach

  • 730,00 m2
  • 18,00 %
  • 700,00
  • The place is located between the Plaine des Bouchers and the QPV (Quartier Prioritaire de Ville) of Elsau, whose economic activity is limited to that of an industrial and service area. Landlocked between cycle paths, roads, river and railroads, and close to reservoirs of biodiversity, this area concentrates as great a diversity of routes, landscapes, as public: boatmen and yachtsmen passing the lock, cyclists and walkers from Strasbourg and tourists, employees of the industrial and service zone as well as a population with social insecurity residing in neighboring social structures.

    The lock house is located along the Rhône-Rhine canal and the Euroroutes vélo 5 and 15, synonymous with a large flow of cyclists, who already seem to make the Orée 85 a stage in their journey. These roads make it easy to connect the place to the center of Strasbourg (in 10 minutes) as well as to more distant geographical points.

    ADOMA, emergency accommodation center located 200 meters from the site; Entraide le Relais, day center for people with social and professional difficulties located 700 meters from the site; or even La Cloche, a national network for the fight against extreme exclusion located a little further away, are all structures present before our arrival that we fully integrate into the various activities of the project (participatory work sites, kitchen and garden workshops).

    Finally, the development of the outdoor space and the operation of the place are harmoniously integrated into the surrounding ecosystems, with the aim of preserving and developing them: development of a natural vegetable garden on an area of 100 m² and partial auto-food production, installation of beehives, planting of seeds of local species and conservation of the vegetation in place. Biodiversity refuges and ecological corridors ensuring the movement of biodiversity between the two reservoirs of biodiversity of the green toad are also enriched.


    • Earthquake
    • Snow weight
    • Frost
    • Hail

    The foundations were placed in frost protection.
    The extensions are made of light wooden structures, separated from the existing structure.
    The structure of the veranda was dimensioned with respect to the climatic and seismic conditions of the site (Seismic: zone 3, moderate / Snow and wind: C1).


Construction and exploitation costs

  • 10 800
  • 100 000
  • 19 100
  • Many elements were made in self-construction and on a participatory site.

Reuse : same function or different function

    • Structural framework
    • Roofing
    • Locksmithing-Metalwork
    • Indoor joineries
    • Outdoor joineries
    • Floorings
    • Partitions
    • Isulation
    • Suspended ceilings
    • Electricity
    • Heating ventilation air conditioning
    • Plumbing
    • Landscaping
    • others...

    Interior Woodwork : 

    • Wooden staircase handrails: 80 m linear (reuse in benches, shelves and bar structure) ;
    • Filmed plywood panels : 15 m² ;
    • PVC interior door *1 unit


    Partitioning :

    • Wooden cleats for the structure receiving the cob: 350 m linear ;
    • Clay soil (reuse) : 12 m3

    Exterior woodwork :

    • Existing windows PVC *10 units (conservation);
    • Existing window door PVC * 1 unit (reuse in situ);
    • Fixed frames of the veranda spandrels: 4 m² glazing (reuse)


    Roofing :

    • Double glazed windows reused in veranda roofing (laminated): 19 sq. m.


    Insulation :

    • Insulation under the face of the attic (rock wool): 50 m², thickness 120 mm;
    • Polystyrene insulation of the walls: 180 m², thickness 60 mm


    Framework :

    • Wooden cleats reused in the lower floor of the veranda to maintain the blocks of wood wool insulation: 30 linear meters;
    • Wooden cleats reused in laths of the wood frame walls of the veranda: 50 linear meters;
    • Wooden cleats reused in counter laths to support the siding of the veranda: 90 linear meters


    Plumbing :

    • WC x2 u (conservation)
    • Sinks x2 u (reuse)
    • Collector and ceramic network preserved


    HVAC :

    • Individual gas boiler * 1 unit
    • Water radiators x8 u (conservation)
    • Fridge 3 doors: 1 unit


    Electricity :

    • Boat Anchor Buoys: *3 units
    • Ceiling lights and lampshades *10 units


    Flooring :

    • 19m2 of solid oak flooring
    • 35m2 of laminate flooring (conservation)
    • 1 sqm tile floor
    • 50m2 of sea rush 


    False ceiling :

    • Placo in under face of roof: 50 m ² (conservation)
    • False ceiling plaster on reed: 95 m² (conservation)


    Metalwork :

    • Exterior metal staircase: 1 u (1.20 ml, 9 steps)

    Exterior fittings :

    • Handrails of wooden staircase reused in wooden fence: 120 linear meter
    • Blocks in Vosges sandstone : 1.5 m3 (reused in situ)
    • Blocks in Vosges sandstone : 3 m3 (reuse)
    • Outdoor summer bar: Cable trays (main elements of the structure of the installation): 100.60 linear meters 
    • Metal angles for the framework: 110 ml
    • terrace boards for the seats: 17 ml
    • Mesh: 25 m² (25 sq. ft.)
    • Plexiglass PMMA for the cover: 35 m².
    • Melamine panels : 4 m² (4 sqm)
    • Wooden cleats to maintain the panels : 30 ml
    • Handrails of staircase : 23 ml
    • Fabrics : 40 m


    Henhouse :

    • Office doors 10 units
    • Wooden cleats to hold the doors : 15 ml
    • Door handle : 1 u

    Others :

    • Melamine panels for a temporary floor of the building site: 20 m².


    Interior and exterior furniture :

    • Bedside lamps x10 u
    • Interior bistro chairs x12 u
    • Interior chairs x5 u
    • Stools x7 u
    • Consoles x5 u
    • Chest of drawers x2 u
    • Office chairs x6 u
    • Outdoor bistro tables x10 u
    • Outdoor bistro chairs x80 u
    • Garden tables x2 u
    • Garden chairs and deckchairs x15 u
    • Sofas/Benches x2 u
    • Armchairs x6 u
    • Indoor tables x4 u
    • Metal cabinet shelves (for bar shelves) x4 u

    • Social landlord VivaEst, demolition site of residential buildings in Hombourg Haut (57)

    Wooden cleats (purchase), coming from the cellars claustras of the building site, reuse in support of interior cob, in under face of floor of the veranda, in structure of the furniture of the external summer bar, in support of doors of the henhouse, in laths and counter-laths of the siding of the veranda, 508 ml.

    Wooden staircase handrails (purchase), from the building site, reused in interior benches, interior shelves, exterior fence, shelf for the exterior summer bar, structure of the interior bar furniture, 200 ml

    Double glazing of laminated windows (purchase), from the cleaning of the PVC joinery in the facades of the building site, reuse in the roof of the veranda and in the window sills of the veranda, 23 m².


    • Client CEA, General contractor CKD : demolition site of the administrative and technical center in Schirmeck (67) 

    Wooden beams (purchase), from the cellar claustras of the building site, reuse in support of interior cob, in under face of floor of the veranda, in structure of the furniture of the external summer bar, in support of doors of the henhouse, in laths and counter-laths of the siding of the veranda, 57 ml.


    • Physical platform of re-use of the demolisher Premys agency Ferrari in Mulhouse (68)

    External metallic staircase: (purchase), reuse with the identical, 1.836 (F 1/1) (1 unit).


    • Site of the Orée 85 (conservation in situ and reuse)

    PVC interior door: conservation in situ, reuse (door from the ground floor to the cellar), 1 unit.
    PVC windows: conservation in situ, reuse, 10 units
    PVC door windows: from the site of the Orée 85, reuse of the east facade to the west facade, 1 unit
    Water radiators: 8 units, conservation in situ, reuse as is
    WC: *2 units, conservation in situ, reuse as is
    Basin : *1 unit, reuse in situ as is
    Individual gas boiler: 1 unit, conservation in situ, identical re-use
    Collector and ceramic network: conservation in situ, identical re-use
    Parquet: 35 m², conservation in situ, reuse as is
    Placo in the underside of the attic: 50 m², conservation in situ, identical re-use
    Insulation under the face of the roof (rock wool): 50 m², conservation in situ, reuse as is
    Polystyrene insulation of the walls: 180 m², conservation in situ, reuse as is
    Blocks in Vosges sandstone: 1.5 m3, waste from the drilling of a span opening at Orée 85, reused as a heat reservoir for the vegetable garden
    Mesh : 25 m², conservation in situ, reused as a covering for the outdoor summer bar and as a support for the decorative fabric.


    • Le Bon Coin 

    Basin : *1, purchase on the Bon Coin (67), reuse in the same way
    Ceiling lamp and lampshades : 10 units, bought on the Bon Coin (Bas Rhin 67), identical re-use
    Solid oak flooring : 19 m², bought on the Bon Coin by l'Orée 85, identical re-use
    Sandstone blocks from the Vosges: 3.5 m3, donated on the Bon Coin (67), reused as a support for the outside ramp backfill
    Sea rush : 50m2, bought on Leboncoin (52), reused as flooring
    Bedside lamps: 10 units, bought on the Bon Coin (67) by the Orée 85, reused identically
    Chairs of interior bistro: 6 units, (purchase), reuse with the identical
    Chairs interior: 3 units, purchase, reuse of the same
    Stools: 7 units, bought on the Bon Coin (67) by the Orée 85, identical reuse
    Consoles : 5 units, bought on the Bon Coin (67) by the Orée 85, identical reuse
    Outdoor bistro tables : 10 units, bought on the Bon Coin (67), identical re-use
    Outdoor bistro chairs : 80 units, bought on the Bon Coin (Avignon 84), delivered by a carrier, identical re-use
    Garden tables : 2 units, bought on the Bon Coin (67), identical reuse
    Garden chairs and deckchairs : 15 units, bought on the Bon Coin (67), identical reuse
    Sofas/banquettes : 2 units, bought on the Bon Coin (88), identical re-use
    Armchairs : 6 units, bought on the Bon Coin (67), identical reuse
    Indoor tables: 4 units, bought on the Bon Coin (68), identical reuse
    Metal shelves of cabinet (for bar shelves): 4 units, bought on the Bon Coin (67), identical reuse


    • Emmaus Association (67)

    Chairs of interior bistro: 6 units, (purchase), reuse with the identical
    Chairs interior: 2 units, purchase, identical reuse
    Chest of drawers: 2 units, bought from Emmaus (67) by Orée 85, identical reuse


    • BBNE construction site in Strasbourg (67)

    Filmed plywood panel: donation. Reuse in furniture, 15 m².


    • Construction site of a housing estate in Mommenheim (67)

    Excavated earth : donation, reuse for cob, 12 m3

    3-door fridge: 1 unit, purchase of reuse by the company Techniciens des Brasseurs (67), reuse in the same way


    • Company VNF (Voies Navigables de France) (Strasbourg 67)

    Anchoring buoy: 3 units, donation, reuse in outdoor lampshade


    •  Donation of a private individual, Strasbourg (67)

    Tile : 1 m². Reuse in mozaic at the back of the interior bar


    • L'Art et la Matière, associative platform of collection and resale of reused materials in Mulhouse, Alsace (68)

    Plexiglass PMMA : 35 m² (Purchase), reuse in roofing of the outdoor summer bar
    Fabric : 40 m², bought at the physical platform of reuse l'Art et la Matière in Mulhouse (68), reuse in aesthetic covering of the outdoor summer bar



    • Physical platform of reuse BOMA in Strasbourg (67)

    Cable trays : 100.6 ml (purchase), from the rehabilitation of offices in Illkirch (67), reuse in the structure of the outdoor summer bar
    Metal angles: 110 ml (purchase), from the end of stock of Leroy Merlin Strasbourg, reuse in support of the cover of the outdoor summer bar
    Terrace boards: 17 ml (purchase), from Leroy Merlin Strasbourg's end of stock, reused as seats for the outdoor summer bar
    Office doors: 10 units, (purchase), from the rehabilitation of offices in Illkirch (67), reuse in the facade of the outdoor chicken coop
    Melamine panels: 24 m², (purchase), from the rehabilitation of offices in Illkirch (67), reused for the creation of a temporary floor during the works, and in vertical covering of the outdoor summer bar
    Door handle: 1 unit, (purchase), from the rehabilitation of offices in Illkirch (67), reuse of the same
    Metal shelves of cupboard: 4 units, (purchase), reuse in shelves of the sky of bar
    Office chairs: 6 units, (purchase), from the rehabilitation site of offices in Illkirch (67), identical reuse

Sustainable design

    Double glazing of windows 

    > Purchased from the social landlord VivaEst, from the cleaning of PVC joinery in the facades of the demolition site of residential buildings in Hombourg Haut (57), reuse in the roof of the veranda (19 m²) and in the window sills of the veranda (4 m²), 23 m² in total.

    => Mode of installation :

    For the cover :
    Installation of glazing by the company LaForgerie: installation of an aluminum blade (60*10 mm) on the wooden frame, installation of the reused glazing with jointing for waterproofing, installation of a clamping blade (60*10 mm) to maintain the complex of coverage.

    For the spandrels in the facade  :
    Prefabrication in workshop of the fixed frames in raw steel, crimping of the re-used glass in the frames, silicone joints, installation of the finished frames on the site, oiling of the metal frames to avoid any oxidation.

    => Differences compared to an industrial material :

    • In the design phase: the deposit had not been identified at the time of filing the permit, the architect had to propose a provisional calpinage corresponding to the deposits of laminated glass usually encountered during demolition sites. When the definitive deposit was decided, the project was updated to reflect the real situation.
    • The installation of these re-used glazings required a screening of the framework based on the size of these glazings. The framework of the roof had to be accurate to the milimeter to match the dimensions of the glass. A lot of educational and coordination work had to be done beforehand to make the carpenter and the locksmith aware of these specific issues. The glazing was installed not by a glazier, but by a locksmith, who accepted the responsibility.
    • Purchase of larger quantities to compensate for breakage or defects in certain materials.
    • Storage on the Orée site awaiting installation.

    => Critical Analysis :


    • Saving of 2000 euros HT approximately realized;
    • Allowed to apprehend how to conceive and build with reemployment;
    • All the actors, companies included, could benefit from this practical case of the approach of reuse;
    • Guided an aesthetic choice for the project.

    Possible improvements:

    • Purchase materials prior to calpining, to directly incorporate the dimensions of the reused materials;
    • Make sure that the movement of reused materials stored on site is easy (palletization, cleaning of materials after reception, adapted packaging...).

    If to be redone, with which product? the same one! :D

    Fenêtre double vitrage feuilleté et non feuilleté

    Crédit photo : BOMA


    Wooden cleats

    > purchased from the social landlord VivaEst, from the demolition site of residential buildings in Hombourg Haut (57) + purchased and from the demolition site of the administrative and technical center of the CEA in Schirmeck (67) (supplier: general contractor CKD): reuse in support of interior cob, and in lathing / counter-lathing

    => Mode of installation :

    The claustras were deposited (with nails) or cut between nails (no nails) on site. They were brought on the building site in their state of use (rough sawing, dusty, aged, studded, ..)
    They have been cleaned by a team of volunteers.
    They were installed during participative workcamps : screwed.

    => Differences compared to an industrial material :

    • Loss of time for the preparation of the material;
    • Lack of quantity (several building sites to find, limit of the deposits);
    • Cumbersome storage on the site of the Orée while waiting for installation + required several displacement of these cleats on the points of storage before implementation;
    •  Iso cost with a new material (100 euros HT of economy).

    => Critical analysis:


    • The claustras were delivered on site by the company in charge of depositing them selectively on the building site. The company being located at 10 min of the construction site of the Orée 85.
    • Sufficient quality for the use that was made.

    Possible improvements:

    • Removal upstream by another structure
    • Purchase of a batch of claustras cut out between the nails, to avoid splitting

    If to be redone, with which product?  : downgraded cleats

    Claustras des caves

    Crédit photo : BOMA

    Chantier d'origine :

    Crédit photo : BOMA


    Exterior galvanized staircase

    > Purchased at the physical platform of reuse of the demolisher Premys agency Ferrari in Mulhouse (68), reuse to the identical, 1.836 (F 1/1) (1 unit).

    => Mode of installation :

    In the upper part of the staircase (on the terrace): fixing by threaded rods and bolts, and chemical sealing
    In the lower part of the staircase (on the ground): support on buried sandstone blocks.

    => Differences compared to an industrial material :

    • Search for reuse materials suitable for this use and very specific dimensions.
    • Delivered not disassembled, and not on the building site because of the problem of impossible access to the semi-trailers > it was thus disassembled outside the building site, to be moved by hand (extremely heavy) on the site located at 200 m.
    • One of the rails was shorter (staircase probably coming from an emergency staircase with a turning landing). A wooden connector had to be installed to make up for the difference in length.
    • Storage on the site of the Orée awaiting installation (garden).

    > Critical analysis :


    • No major modifications had to be made
    • The staircase was perfect for the intended use!
    • Savings of 1000 euros HT approximately realized

    Possible improvements :

    • Check the geometrical characteristics beforehand (length of the stringers, demountability, weight), so that the material is in conformity with its future use.
    • The staircase was supplied without the system of fixing to the high support. We were not informed of this at the time of purchase.

    If I had to do it again, with which product? The same one, it was (almost) perfect!

    Economy of functionality: no

    Use of wood > adapted sector
    Use of cob earth straw > adapted sector or compost
    Use of non-composite metal > adapted die

    Recycled materials: no

    The intervention on the existing is quite light, it consisted mainly in the opening of several walls / partitions, in order to make more spacious rooms.
    It will therefore be easy to reuse these parts for other uses, or to close them if necessary.

    Laine de bois épaisseur 120 mm en sous face de terrasse
    Bois de charpente et lames de terrasse d'essence locale (Douglas et épicéas des Vosges)
    Lambris d'essence locale (Sapin des Vosges)
    Chaux adjuvantée à la caséine et la poudre de marbre en provenance d'une usine locale (cloisonnement)
    Plan de travail en bois brut (frêne olivier des Vosges)
    Paille en bottes (67) pour le torchis

Environmental assessment

    Not found in the excel file :

    • Wooden cleats (565 ml)
    • Plexiglass PMMA (35 m²)
    • Melamine panels: 24 m² (24 m²)
    • Filmed plywood panel : 15 m².
    • Anchoring buoy: 3 units
    • Metal angles: 110 ml
    • Cloth, 40 sqm
    • Chest of drawers x2 u
    • Garden tables x2 u
    • Sofas/benches x2 u
    • Armchairs x6 u
    • Metal cabinet shelves (for bar shelves) x4 u

    The reuse operation saved the equivalent of 184385 kilometers traveled by a small car, or 210 trips from Paris to Nice, 58103 rectangular bathtubs filled with water and 45 years of household waste of a French person.

    Categories Avoided CO2 (kg)  Avoided water consumption (m3) Avoided waste (kg)
    Outdoor facilities 3130,089373 78,16430007 3124,199277
    Exterior fittings / Locksmithing - Metalwork 0 0 0
    Carpentry 0 0 0
    Partitions 0 0 0
    Coverage 0 0 0
    Roofing / Exterior fittings 0 0 0
    Lighting 99,59978333 0,5269783183 98,89425754
    Safety lights 0 0 0
    Climatic engineering equipment 0 0 0
    Electrical equipment 857,0411673 112,7128224 169,1460964
    Facades 0 0 0
    False ceilings 0 0 0
    False floors 0 0 0
    False ceilings 0 0 0
    Structural work 11058,54772 77,12511822 13752,43968
    Sanitary installations 317,3809482 3,956735663 231,5469773
    Insulation 0 0 0
    Exterior carpentry 328,82548 1,89198508 312,6681095
    Interior carpentry 2435,084134 986,4242402 2531,861006
    Furniture 4805,694165 7451,257179 2248,286659
    Paint 0 0 0
    Plumbing 0 0 0
    Floor coverings 15,85368983 3,386299268 32,68984407
    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)
      23048,11646 8715,445658 22501,7319
      Km in a small car Nb of rectangular bathtubs nb of years of household waste of a French person
    Equivalent 184385 58103 45
    Equivalent tript Paris- Nice 210,0    

Reproductibility and Innovation

    Main stages of the project


    1. The client was surrounded by actors specialized in reuse (MOE, BET EC).
    2. Regular exchanges around the project and definition of the stakes and needs of the client, during meetings with the client, the project manager and the circular economy consultant. These exchanges were done very early, allowing to work in parallel of all the phase of design and works.
    3. Realization of a catalog of materials of re-use to be injected in the operation for the realization of the sourcing (quantity, estimated price, dimensions, building sites deposits).
    4. Very regular exchanges between the actors of the project and communication on the evolution of the needs in design phase (dimensions or more precise technical characteristics).
    5. Regular updates on the targeted materials. Confrontation between the targeted materials and the technical, economic and logistic constraints of the operation. Once the materials were validated, the decisions were quickly taken by the client and the contractor, which greatly facilitated the search/reservation/purchase of the reuse materials, as well as the resulting logistics.
    6. The materials are reserved/purchased from the deposit sites. The invoices and contracts of transfer are established by BOMA for the traceability of the materials.
    7. The transport is organized, the materials are delivered on the construction site of the Orée 85, or are temporarily stored in the BOMA stock.
    8. DCE companies: there was no specific market for reuse. For each lot, certain services were identified as being the installation of elements of reuse by the companies. The project manager has made the contractors aware of the issues of a construction site using reuse.
    9. The materials are restored or transformed for reuse and installation according to the plans of the project manager.



    The materials were stored on the building site while waiting for their implementation, or in the BOMA stock located not far from the operation (free of charge). The companies thus had at their disposal the materials of re-use ready to use, already bought and stored by the project owner.
    The transport of the materials coming from deconstruction sites and the materials necessary for the participative workshops was subcontracted to a local integration company (PrestaTerre company). The transport of the metallic staircase was subcontracted to the demolition company Premys Ferrari.

    Obstacles and solutions: 

    => changes in the timing of demolition / deconstruction sites (delays) :

    • The mission of sourcing reuse materials was launched very early in the project. This allowed to have time to look for the adequate materials, to have a long term vision of the available materials and their temporality of removal, to be able to source on another building site/platform in the event of a delay of operation on a deposit building site.
    • setting up selective cleaning lots on deposit sites before the demolition lot, in order to make materials available upstream for re-use

    => degradation of materials (squats) before selective disposal on the deposit site:

    • This reduced the quantity of targeted materials. We found other deposits in time, thanks to the sourcing of materials very upstream on the operation.

    => raw state of the materials >> preparation of the materials by the companies before reuse or installation

    => Help to make the decision to buy materials:

    • the possibility of having had a sample of certain materials (laminated glazing) upstream for the MOE. This allowed him to understand the specificity of the material versus its future use.

    => Insurance :

    • The decennial insurances of each company take care of the works carried out, including in materials of reuse.




    • Sensitization of the companies of the building site through the MOE.
    • The sourcing mission led by BOMA includes an awareness of the circular economy approach of the building sites or actors. The future use and the place of reuse of the materials are communicated. A balance sheet of the reused materials is realized and diffused.
    • We have created an event for the Architecture Days at the Orée 85, in the form of 2 site visits to explain the global approach of reuse on this operation and the design approach including the circular economy, in order to raise awareness, inspire and make the approach concrete. The target audience of this event is: all public + building actors. This visit took place during the construction, on 29/10/2021, presented by the project management and BOMA, and gathered 20 visitors.
    • Organization of the Recup, a 2-week workshop co-organized by Boma and Atelier Na, to raise awareness and skills of architecture students on the subject of reuse. Realization of the summer bar during this workshop by the students, based on reused materials.
    • Organization of a participative workshop open to all "Poules Party" for the creation of a henhouse in reused materials.
    • Multiple events will take place on this site during 2022, to raise awareness of the general public and professionals to this circular economy approach.


    Role of the actors

    The project owner, the project manager and the circular economy consultant have been the driving force behind the overall reuse approach on this project.

    Project owner : Orée 85

    Reuse and circular economy are at the heart of this renovation project, and are part of the DNA of the Orée 85 project management team.
    This team has surrounded itself with a project manager with experience in design taking into account the circular economy, and a circular economy accompaniment for the sourcing of reused materials.

    Project manager : Joachim BOYRIES

    Complete mission of project management (ESQ > AOR)
    Specific design in reuse materials
    Verification of the insurability of the realized works
    Follow-up of the building site (OPC)
    Sensitization of the construction site's employees to the circular economy approach

    AMO reemployment: BOMA les BOnnes MAtières

    Accompaniment of the contracting authority on the operation by the sourcing of the materials of re-use and the organization of the logistics.
    The mission consisted in :
    Realization of a catalog called "reversed" listing the detailed needs of the Project pointed out by the MOE.
    Sourcing of the materials of Re-use pointed out:
    research with the BOMA network from the inverted catalog,
    evaluation of the logistic and economic feasibility for the materials having an interest of re-usability in situ, in permanent dialogue with the EMO and the Owner.
    Reservation of the material of Re-use for the project.
    Establishing a relationship between the client and the owner of the reused material.
    For each reused material identified, a liaison document is progressively sent to the Owner, including technical characteristics, name and contact details of the owner of the material, possible price set by the owner of the material, logistical and economic assessment.

    Organization and conduct of participatory workshops : ATELIER NA

    Mission of assistance to control of use:
    Identification of potential partner actors, assistance in defining the spatial needs of the owner, co-design workshops
    Mission of participative workcamps:
    Co-organization of the ReCup workshop (summer university) for the construction of the outdoor summer bar in reuse (with BOMA)
    Organization of the participative construction site of the henhouse
    Co-organization of the participative building site of the cob (with Low architech)

    Low architech

    Sampling of the cob to prepare the workshop
    Co-organization of the participative building site of the cob

    On this operation, only one Project Manager intervened to manage the renovation. The decision of which materials to cure or to keep for reuse has therefore been simplified.
    Conservation concerned quantities of materials that could be protected during cleaning for reuse in the project, without posing any particular problems for the renovation.

    • The materials deposited for reuse in situ have been deposited/replaced consecutively, to avoid breakage or storage.
    • The deposited materials (approximately 6 m3), not reused in situ, were sorted in situ and evacuated by the companies in the appropriate channels.

Economic assessment

  • 10 000
  • 10 %
  • 30 000

Social economy

    SSE structures:

    Orée 85: Project owner, cultural and solidarity third place, SCIC cooperative

    Atelier Na: collective of architects whose goal is to “build together”. Leading projects in a design-realization process with and for the inhabitants, this collective works in the form of residencies, workshops and participatory projects involving itself with the different actors who make up the city, municipalities, schools and universities, local and national associations, …. As part of a global ecology approach, Atelier Na makes maximum use of recycled and biosourced materials.
    > co-organization of the Recup student workshop and the Poules Party participatory workshop
    >> Cable trays, metal angles for the frame, terrace boards for the seats, mesh, Plexiglas PMMA for the roof, melamine panels, wooden cleats to hold the panels, stair handrails, fabric
    >>Office doors, Melamine panels, Door handle

    PrestaTerre (Altaïr Group) : integration company, carried out the selective removal on the Hombourg Haut and Schirmeck deposit sites, then carried out the transport from these sites to the Orée 85 site.
    >> Wood screen walls, window glazing, stair handrails

    BOMA: Circular economy design office, SCIC cooperative

    Low architech : prime contractor and straw clay craftsman, member of the CAE "Au cordeau" cooperative

Water management

    As the building is not yet in operation, no relevant water consumption data is available.

Indoor Air quality

    The renewal of the air is done by a simple flow extractor.
    All the materials used in this renovation are free of VOCs and formaldehyde (class A+ paint, natural lime coatings, natural floor coverings, etc.).


    The use of bio-sourced materials guarantees a healthy amount of indoor air.
    Accessibility for people with reduced mobility has been designed to allow everyone ease of use (access ramp to the terrace, entrances with reduced mobility threshold, accessible sanitary facilities for people with reduced mobility).
    The adaptability of the veranda and the terrace to seasonal cycles allows everyone to fully enjoy the place, at any time of the year.

Life Cycle Analysis

    • Exterior wood Douglas and spruce
    • Interior wood: olive ash and MDF
    • Lime
    • Cob
    • Basketry
    • seagrass
    • hemp ropes

Reasons for participating in the competition(s)

Without being motivated by evolving legislation in the circular economy sector, nor seeking to be part of a marketing trend in the era of the social and solidarity economy, the Orée 85 team and its partners feel deeply driven by the principles of sustainability. Ecology, social and economy converge in everyone's fields and have naturally intersected on the habitat side.

By being invested in all the multiple aspects of the project for this social and cultural third place and by wanting to consider sustainable construction as a normality, the internal team came to forget the efforts it was making in that Sens. It was the BOMA collective that invited us to become aware of the legitimacy that we would have to participate in this competition: the quantity of second-hand furniture and materials, the quantity of reused materials and the many innovations in terms of reuse (roofing windows, wooden fence and furniture, chicken coop, summer bar, etc. have earned us an environmental record that is sufficiently exemplary to compete for the Circular Buildings Trophies 2022.

Building candidate in the category

Prix hors-cadre

Prix hors-cadre

Trophées Bâtiments Circulaires 2022

 Circular Buildings Trophies 2022
 circular economy
 materials and solutions
 participatory construction
 raw earth

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    Trophées Bâtiments Circulaires 2022