Headquarters of the council of the Occitanie order of architects

tertiary building renovation reuse building products and materials wood Circular economy

1000 Last modified by the author on 22/05/2023 - 11:33

Renovation

Building Type : Office building < 28m
Construction Year : 2022
Delivery year : 2023
Address 1 - street : 24 rue Croix Baragnon 31000 TOULOUSE, France
Climate zone : [Cfb] Marine Mild Winter, warm summer, no dry season.
Net Floor Area : 258 m² SU
Construction/refurbishment cost : 205 000 €
Number of Work station : 11 Work station
Cost/m2 : 794.57 €/m²

Primary energy need
kWhep/m².an
(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

General information

The CROA office development operation is part of the largest renovation project for the Cour Baragnon space led by Scalène architectes: the “Cour Baragnon” project. This is a private promotion operation led by the Carle Group, and in synergy with other players in architecture and urban planning in the region, and in particular:

CAUE 31 : Council for Architecture, Urbanism and Environment of Haute-Garonne
MAOP : House of Architecture Occitanie
Training Island : Training organization
AMO OMP : Architecture and Owner Occitanie Midi-Pyrénées
AIOC : Engineering Association of Occitanie
FFP : French Landscape Federation
FFB : French Building Federation
APUMP Occitanie : Association of urban planning professionals of Midi-Pyrénées

This project consists of a restructuring of the building with recovery and solidification of the floors, replacement of the old passageway by a new suspended one, replacement of the old frame on the top floor, change of joinery at each level and opening of the ground floor in order to receive the public in the courtyard.

It carries the following guidelines:

Attract audiences to a courtyard that organizes the site. This space is the witness of an open programming. This exhibition space, open to the street, the porch and the courtyard, can function when the offices are closed.
Autonomy and cohabitation of institutions: Maison de l'architecture, CAUE, Regional Council of the Order of Architects: Cour Baragnon is a common banner that federates and brings together these institutions, in the eyes of the public as well as in the eyes of professionals. Because before being autonomous institutions, with distinct missions, they have this common point of addressing audiences (professional or uninitiated) on similar issues of awareness, promotion, enhancement and implementation of architecture and living environment.
The cultural center on a metropolitan scale: the Croix Baragnon space was described as “a space of openness and creation”, which goes “to meet the public and Toulouse residents”. It has a mission of “springboard and the programming of innovative projects”. In a few months, the place will welcome the public and a multitude of events. there will always be somethingto see or do.

In this operation, the CROA occupies the third floor of this space spread over 5 levels. He shares this space divided into two floor areas of 258 m2 and 40.5 m2 with two other project players:

The Training Island
The House of Occitanie Architecture.

The objectives of the CROA premises development project

In addition to the various tools available to the CROA, this new premises within the “Cour Baragnon” project will be a major asset for accomplishing its missions and defending the values of the discipline and the profession. Beyond the privileged location of the building, its obvious architectural and heritage quality as well as the strategic grouping of the various structures that will occupy it, the plateau development project will physically embody the architectural ambition of the Occitanie region. The environmental, economic, social or cultural dimensions defended by the Order of Architects will symbolically take shape in this project.

The architectural intentions

The concrete application of the three fundamental principles of design of workspaces, that is to say a diversity of spaces, a diversity of postures and a diversity of presences is to be considered for the layout of the platform . A sensitive work on the second work will reveal the spatial value of the courtyard building, composing with its repetitions of bays and its systems of transparency. It will exploit the qualities of natural light and ventilation intrinsic to the typology. The development will maintain a distinction between the structures accommodated while guaranteeing an ecosystem of uses, a spatial continuum and overall coherence. Also, the furniture will be a precious ally to define visual identities, formalize uses in space and anchor the soul to the place.

Building users opinion

The CROA Occitanie had a positive image of reuse before the project without knowing the ins and outs of such an approach. The CROA embarked on this approach without experience of it, on an experimental basis, to improve the environmental impact of the project.

The reuse approach showed limits in the construction site with the impossibility of supplying all the lots, the choice and availability of materials remain limited in Occitanie. However, the overall impact of reuse is quite positive. The quality of the reused materials is equivalent to that of the new one and it is impossible to make the difference between the elements and those reused on delivery of the building.

If you had to do it again?

Isthme was familiar with the reuse process and had a positive image of it before the start of the project. However, the agency had so far not carried out any project implementing elements of reuse.

For us, the important thing in this process was to:

Improve construction processes in an ecological and circular economy approach.
Open up the field of possibilities by using materials that have a different history and aesthetics than commercial ones.

Our feedback has shown us that reuse is an approach that must be integrated into the methodology for developing the project right from the sketch. It is not always easy to implement reuse projects and it is necessary to find craftsmen who will accept this type of approach. Reuse can nevertheless be a source of savings in certain positions.

The quality of the reused materials is globally equivalent to that of new. In some cases, it can be better or worse. On our construction site, we have managed to make significant savings thanks to the reuse of doors. However, this required a heavy restoration work which does not allow, despite everything, to find the quality of new. On the contrary, the bookcases and tables made with the joists of the lower floor made it possible to bring a quality to the works that it would have been impossible to find with new materials.

The implementation of a re-use approach requires companies to be more flexible and responsive with regard to the supply of supplies, particularly when it comes to deposits outside the project.

We had anticipated the subject by calling on companies that we knew were ready to embark on this type of experiment. Throughout the project, it was necessary to discuss with the re-employment BE and the companies in order to find the right solutions. For the architect, this is additional work.

The main obstacles to the reuse process on this project were:

The very short construction deadlines;
The constraints related to the technical opinions and responsibilities that everyone must bear on the works carried out.

The AMO reuse supported us during the studies and the construction site by providing proposals and technical solutions. It was she who, among other things, managed the supply.

For us, the reuse has had an impact on the aesthetic aspect of the project and on the preservation of the architectural heritage. We had a very tight budget to carry out this project and had to make many compromises. Finally, we decided and succeeded in preserving the reused furniture and it is thanks to these works that the project finds its full meaning.

Photo credit

Isthme bureau méridional
Tournesol

Stakeholders

Contractor

Name : Conseil régional de l'ordre des architectes Occitanie

Contact : oa.occitanie[a]architectes.org

https://www.architectes.org/

Construction Manager

Name : Isthme

Contact : isthme.bm[a]gmail.com

https://www.isthme-bm.com/

Stakeholders

Function : Environmental consultancy

Tournesol

francois[a]maisontournesol.fr

https://www.maisontournesol.fr/

Reuse

Function : Environmental consultancy

Mona architecture

mylene.gouin.architecture[a]gmail.com

AMU

Contracting method

Other methods

Type of market

Not applicable

Allocation of works contracts

Separate batches

Energy

Costs

Construction and exploitation costs

Total cost of the building : 205 000 €

Circular Economy

Circular economy strategy

Phase in which reuse has been integrated : Programming

Type of circular economy strategy implemented :

Maximization of the number of impacted batches
Maximization of quantities on targeted products
Maximization of the carbon gain
Maximization of the mass of waste avoided

Quantified targets for reuse? :

A target of 10% reuse of materials is set for the project.

Integration of reuse into the written contract documents : Creation of a specific circular economy batch

Validation protocol for reused materials : Yes

Validation protocol for reused materials :

Tournesol (reuse batch) produces the product sheets for each element. In the same way as for new products, these sheets bring together all the characteristics (physical, technical, dimensional, regulatory, etc.) of the reused materials.

These sheets are approved by the Project management assistance reuse. This operation is completely internalized by the reuse batch on this operation.

Since the volume of the project does not make it possible to amortize the test and reuse pass investments, it is decided upstream to avoid materials and elements requiring a visa from the control office to remove the obstacles to their use.

The materials are validated by the roject management and the Project management assistance.

Deposit validation form : Yes

Reuse : same function or different function

Batches concerned by reuse :

Indoor joineries
Plumbing
others...

For each batch : Reused Materials / Products / Equipments :

Lot 1: partitions, ceilings, painting, cleaning:

Total quantity of materials: 9300 kg
Total quantity of reused materials: 0 kg

Lot 2: interior woodwork:

Total quantity of materials: 1900 kg
Total quantity of reused materials: 410 kg

Lot 3: interior joinery from reuse:

Total quantity of materials: 1679 kg
Total quantity of reused materials: 1679 kg

Lot 4: plumbing, heating, ventilation, air conditioning:

Total quantity of materials: 365 kg
Total quantity of reused materials: 15 kg

Lot 5: electricity, SSI:

Total quantity of materials: 200 kg
Total quantity of reused materials: 0 kg

Lot 6: floor covering

Total quantity of materials: 920 kg
Total quantity of reused materials: 0 kg

Batch 7: furniture:

Total quantity of materials: 1450 kg
Total quantity of reused materials: 1450 kg

TOTAL :

Total quantity of materials: 15814 kg
Total quantity of reused materials: 3554 kg (22%)

Reused materials rate :

The materials preparation work concerns only the interior joinery elements.

The elements intended for the plumbing batch come from dormant stock from the site or from an order error, they are still packaged in their original packaging and are just waiting to be installed.

The wooden beams and joists from the floors are in relatively good condition for their age >100 years. However, they require a lot of preparatory work before they can be used as raw materials:

First step: unnailing all the nails used to hold the floor
Step two: stripping
Third step: cut to size
Fourth step: sanding (superficial, it is decided to keep the rough aspect as much as possible)
Last step: varnishing

The door panels are relatively recent as they date from a renovation to PMR standards. They only require some adjustment work to integrate the custom frames manufactured for the project:

Cleaning
Sanding
Planing
Replacement of hardware items

The elements are placed directly on the project by the companies responsible for the carpentry and plumbing/HVAC lots in the same way as new elements from the site. No difficulty or particular provision has been made to ensure this stage.

Logistics

Rehabilitation and reconditioning operations (if project concerned by a cleaning/demolition stage) : Yes

Storage of materials for reuse in situ (if project concerned by a cleaning/demolition stage) :

On an external platform, in combination with reconditioning operations

Storage of materials from external supply :

No storage on site, but financial contribution for storage by the material supplier on his site

Insurance

Consultation of the technical controller : No

Specific mission given to the technical controller :

Since the volume of the project does not make it possible to amortize the test and reuse pass investments, it is decided upstream to avoid materials and elements requiring a visa from the control office to remove the obstacles to their use.

Insurance broker on the project : No

Consultation of the broker : No

Consultation insurer : No

Environmental assessment

Impacts avoided : water, waste, CO2 :

With the Reuse Booster calculation tool, here are the avoided impacts:

CO2 emissions avoided: 10,254 kg eq CO2/m²

Water consumption avoided: 703 m3

Waste avoided: 12,198 kg

The reuse operation saved the equivalent of 82,033 kilometers traveled by a small car, i.e. 93 Paris-Nice journeys, 4,688 rectangular bathtubs filled with water and 24 years of household waste for a Frenchman

The calculations previously made by the project are as follows : For the various calculations, the data used are those from the various readings and measurements of the project as well as data made available on:

INIES database.
IMPACTS database, established by ADEME
In this project, the economic impact of reuse being relatively limited due to the low cost of the materials, the reuse rate weightings are based on the weight of the materials and not their cost.

The environmental impacts lot by lot:

+ LOT.01 - PARTITIONS / CEILINGS / PAINTING / CLEANING:

Total quantity of materials: 9300 kg

Total quantity of reused materials: 0 kg

Waste avoided: 0 kg avoided

Carbon impact of reuse: 0 kg of CO² avoided

Water consumption avoided: 0 kg avoided

+ LOT.02 - WOODEN INTERIOR JOINERY:

Total quantity of materials: 1900 kg

Total quantity of reused materials: 410 kg

Waste avoided: 410 kg avoided

Carbon impact of reuse: 638 kg of CO² avoided

Water consumption avoided: 3kg avoided

+ LOT.03 - INTERIOR JOINERY FROM REUSE:

Total quantity of materials: 1679 kg

Total quantity of reused materials: 1679 kg

Waste avoided: 1679 kg avoided

Carbon impact of reuse: 650 kg of CO² avoided

Water consumption avoided: 15kg avoided

+ LOT.04 - PLUMBING / HEATING / VENTILATION / AIR CONDITIONING:

Total quantity of materials: 365 kg

Total quantity of reused materials: 105 kg

Waste avoided: 105kg avoided

Carbon impact of reuse: 100 kg of CO² avoided

Water consumption avoided: 1kg avoided

+ LOT.05 - ELECTRICITY / SSI:

Total quantity of materials: 200 kg

Total quantity of reused materials: 0 kg

Waste avoided: 0 kg avoided

Carbon impact of reuse: 0 kg of CO² avoided

Water consumption avoided: 0 kg avoided

+ LOT.06 - FLOORING:

Total quantity of materials: 920 kg

Total quantity of reused materials: 0 kg

Waste avoided: 0 kg avoided

Carbon impact of reuse: 0 kg of CO² avoided

Water consumption avoided: 0 kg avoided

+ LOT.07 - FURNITURE:

Total quantity of materials: 1450 kg

Total quantity of materialsreuse: 1450 kg

Waste avoided: 1450 kg avoided

Carbon impact of reuse: 10,600 kg of CO² avoided

Water consumption avoided: 30kg avoided

+ TOTALS:

Total quantity of materials: 15814 kg

Total quantity of reused materials: 3554 kg (22%)Wwaste avoided: 3554 kgvity

Carbon impact of reuse: 11,988 kg of CO² avoided

Water consumption avoided: 49kg avoided

Economic assessment

Total cost of reuse : 17 550 €

Reuse quantified in the companies' offers? : Yes

Purchasing process for reused materials :

Purchase by the contracting authority from a reuse platform
Purchase by the contracting authority from another contracting authority

Fees of the contracting authority support : 3 300 €

More details on the economic balance :

Reused materials only appeared on lot 03 joinery from reused. For the other batches, the reuse elements were added as they were validated by the MOA and the harvest on the various external deposits.

The materials are centralized by the reuse batch which collects them by purchasing or by contract for the transfer of materials free of charge.

The collection of these materials is then invoiced to the Project management assistance.

The materials are made available to the companies that install them and withdraw the supply of these in their final invoice.

Total envelope dedicated to reuse: €17,550
AMO reuse: €3,300 excluding tax
Reuse batch: €2,190 excl. tax
Carpentry lot from reuse: €12,060

Savings related to the reuse of materials:

Carpentry lot:

6 doors at €40/unit for reuse versus €220/unit for new => €1,080 in savings
6 farms cost €1/unit for reuse versus €80/unit for new => €474 in savings
4 medium panels €5/unit for re-use versus €150/unit for new => €580 savings
2m3 of larch beam 200€/m3 in reuse against 1200€/m3 in new => 2 000 € savings
34m² of ALUCOBOND at €1/m² for reuse versus €40/m² for new = > €1,326 in savings

Plumbing kit:

Stainless steel sink at €75/unit for reuse versus €250/unit for new => €175 in savings
Stainless steel mixer €75/unit for reuse versus €150/unit for new => €75 savings

Over the entire project, there is a total saving of €5,710 in supplies thanks to the reuse of materials. A non-negligible impact because it represents approximately 5.5% of the project's supply envelope.

In addition, the miscellaneous operations linked to reuse represent a total of €17,550, or almost 9% of the operation's budget.

Communication

Communication on the process : Yes

Project visit : Yes

Circular design

Responsible consumption :

The CROA Occitanie office development project is part of the major “Cour Baragnon” renovation project of the Carle group led by the architecture firm Scalène, which aims to create a single center bringing together all the institutions of the architecture of the Occitanie region: CAUE, CROA, ilôt formation and initially the house of architecture which withdrew along the way.

The ambition of the project is great, as the architect Jean Larnaudie describes it: "It will be a unique place in France, both a showcase for local architecture and an exhibition space for the general public which will be interested in other disciplines, free and open to Toulouse residents”.

Industrial and territorial economy :

The use of materials from industrial waste and not from construction is new compared to the state of the art, the implementation of these elements represents a risk taking, it is a step forward in the methods put in place for the circular economy at the local level.

Eco-design :

It is important to note that the first success of this project is the culmination of the reuse process which, thanks to the commitment of all the project's stakeholders: Project management assistance, contractor and companies, was able to be continued throughout the development phases. studies of the project up to the laying of the materials.

Some failures could not be avoided despite everything, the cleaning site of the Croix Baragnon area was already well underway at the start of the studies and the resource diagnosis. As a result, a large quantity of building reuse materials could not be identified and saved for the future project. We will also note that only three batches out of six were able to be supplied from reuse.

Sustainable supply :

We will note that the objective of 10% reuse set during the studies was largely exceeded with 22% of materials from the circular economy on the project. This was made possible by integration from the sketch phase of the reuse, right through to the written parts of the market. The reused materials have followed a strict validation process set by the Project management assistance reused.

This has extended the life of reused materials, including old beams that are gone for another 100 years. A broader approach to the scope of sourcing has made it possible to integrate materials from industrial waste and not just from the construction sector.

Finally, we will note that the reuse allowed savings of approximately 5% of the project's supply budget. This is an important point to note at a time of the explosion in the cost of raw materials. Reuse is becoming more and more competitive with the supply of new materials.

Recycling :

The focus was mainly on the furniture batch resulting from reuse. This batch of custom-made furniture where the following elements are reused in upcycling:

Joists from the baragnon cross cleaning site
Reinforcing steel from local industrial offcuts
IPE200 profile elements from local industrial offcuts
ALUCOBOND panel from local industrial offcuts

Additional information (PDF documents)

Contest

Reasons for participating in the competition(s)

The ambition of the project since its formulation has been to integrate as many elements as possible for reuse and to provide the means to do so. The methodology used on this operation is based on three axes:

The “extending the lifespan of materials” component of the circular economy (selective deconstruction, reuse/reuse). The objective here is to limit the environmental impact as much as possible (water consumption, waste production, CO2 emissions).
“Reproducibility”: it is important for Tournesol to implement a methodology that is clear and easy to implement on different types of project, we will see later that this is a slight adaptation of our methodology “ kind". The means and methods used are reproducible (on the scale of the territory, on a similar operation) or even generalizable (on the scale of all operations).
Innovation: the use of materials from industrial waste and not from construction is new compared to the state of the art, the implementation of this element represents a risk taking, it is progress in the methods implemented for the circular economy at the local level.