Contractor

Name : Célia Auzou

Contact : 0760225580, celia.auzou[a]gmail.com

Construction Manager

Name : Célia Auzou

Contact : 0760225580 / celia.auzou[a]gmail.com

Stakeholders

Function : Company

TECHNOBOIS
François-Pierre MOURGUES

Function : Company

FERRONERIE MARTEL
Romuald MARTEL
Ferronier

Function : Company

Minéka
Joanne BOACHON
Supplier of reused materials

Function : Assistance to the Contracting Authority

Re.Source Réemploi
Célia Auzou
AMO reemployment

Contracting method

Separate batches

Energy consumption

More information :

There has never been an Energy Audit of the building or DPE.

Real final energy consumption

Final Energy : 3 984,00 kWhef/m².an

Real final energy consumption/m2 : 110,00 kWhef/m².an

Year of the real energy consumption : 2 021

Systems

Heating system :
• Wood boiler
Hot water system :
• Individual electric boiler
Cooling system :
• No cooling system
Ventilation system :
• Single flow
Renewable systems :
• No renewable energy systems

Construction and exploitation costs

• Total cost of the building : 68 619 €

Urban environment

The house is in the middle of nature, in the hamlet Le Chiat which gathers about ten houses, on the commune of Silhac in Ardèche (07) of 300 inhabitants.

Land plot area

Land plot area : 2 000,00 m²

Built-up area

Built-up area : 40,00 %

Parking spaces

1 spot

Building Environmental Quality

Reuse : same function or different function

Batches concerned by reuse :
• Indoor joineries
• Outdoor joineries
• Partitions
• Electricity
• Landscaping
• others...

For each batch : Reused Materials / Products / Equipments :

The elements made in reuse :

• 10 exterior joineries, 9 of which are second-hand from careful deconstructions, order errors and exhibition pieces (see joinery plan). Lot 2680€ including transport (+1350€ of installation in total) ; 
• interior woodwork : for example, the two kitchen worktops made of two sheets of medium wood recovered from the material library, as well as the second-hand tiles that cover them, or the shower room vanity top made of trespa (which falls from the front and is therefore waterproof) + the vanity unit under the vanity top made from an old chest of drawers. We can also mention the baseboards from a surplus of construction site (40ml). Lot 190€ including transport ;
• electrical equipment, i.e. all switches, sockets and lights. Lot 10€ including transport ;
• the terrace, more specifically the wooden slats up to 40 m² collected (via the good corner), cleaned, recut and turned over to be put back in place for 32m², south and north. Lot 150€ including transport ;
• the wall and ceiling covering is from the 2017 architecture biennial (Atelier Utopies) which took place at the Sucrière in Lyon. The implementation of the scenography having been thought upstream as "non-destructive", the boards and wooden slats were linked by rope. Thus, they were virgin and suitable for reuse. They are 100u. of pine panels (2000 mm x 500 mm x 18 mm thick) and cover all the peripheral walls of the house as well as the ceilings of the 3 rooms. In order to limit the falls, the layout was made according to their dimension, limiting drastically the falls. Lot 350€ including transport ;
• the frames of the partitions and the joists, are from the same sourcing as the pine panels. They are 85u. of pine cleats (32 mm x 45 mm x 4500 mm). They receive the panels of the walls, the ceilings and the massive parquet of the ground, while offering the adequate technical space for the passage of the networks. Lot 400€ transport included ;
• the stove and its floor plate, acquired second hand in the village of Silhac, from an acquaintance. I acquired the smallest one I found second hand (from an acquaintance) in order not to overconsume. It makes 4kw and I spend one stere of wood per year (my neighbor cuts it, makes it dry then cuts it for me) to heat the volume in the cold period. Lot 330€ transport included (+1500€ of installation in total with supply conduit and exit in roof) ;
• the sanitary elements, which are the sink, the kitchen sink, the taps from private individuals Le Bon Coin. Lot 110€ including transport ;
• the ventilation grids / air inlets from a private individual Le Bon Coin. Lot 30€ transport included ;
• the painting of the walls is resulting from funds of pots of professional painters. Lot 10€ transport included ;
• furniture and household appliances (sofa, desk, chairs, tables, bed, oven, fridge, hotplates, dishwasher, etc.) from Le Bon Coin. Lot 2600€ including transport ;
• the exterior design, in particular the exterior staircase in mixed technique: high steps in chestnut beams from the deconstruction of an inn in the neighboring village and low steps in stones from the ground, from fallen dry stone walls. The already there takes all its sense. We can add the works in progress at present that are a wooden fence in bastaings resulting from the deconstruction of a wooden slab in the French style and the installation of 3 tanks of water recovery (of 1000L each). Lot 200€ including transport.

Sustainable design

Reusable materials :

The 3 materials are :

1/ the exterior woodwork ; they came from many different sources (see previous category). They were stored at the carpenter's who was able to build the house around their dimensions by having them on site at his workshop. He also made the pre-frames to measure for each of them. It is another craftsman who installed the woodwork. He was not in favor of installing them because he felt he was out of line with his insurance. He notified his invoice that the woodwork he installed was not his doing. 

I think that some of them (notably the two lapeyres) are really light (in their structure) and would not have deserved a second life in a new construction but rather in a bio-climatic greenhouse or a double skin. Their joints have been partly removed since then and will be changed soon. These are the ones I plan to get rid of in the next 5/6 years.

2/ the interior wood coverings ; they are from the Lyon Biennial of Architecture (see previous category). It is the association Minéka which captured the deposit (just like the one of the cleats) and which redistributed it at solidarity price. The implementation was carried out in self-construction. In their majority, they were not recut to limit the falls and the support cleats were posed consequently. For the ceiling, they were installed with a plate lifter (rented for the occasion). They are simply screwed to the brackets in order to be removable at any time. The immense interest that I see there is double:

• I can dig in the wall, that is to say for example to take out the insulation if I had a plate of wood wool which is damaged, or to take again the electric networks passing by there if need be, without having to enter in big works of platrerie. There is only to "close the box" when the intervention is finished.
• in the long run, the plates (as well as the cleats) can be reused without difficulty for a third life.

3/ the plumbing elements ; they come from the good corner. They are old and it was complex to find the bungs, siphons, fittings corresponding. They were also installed in self-construction. They specifically required to be resourceful / handyman / creative to be made usable and durable.

Reversibility / Adaptibility :

This notion appeared as the construction progressed, the more I dug into the notion of reuse in parallel. I also discovered the BAZED reference system at the same time.

As such, the frameworks of the partitions and linings are made of wooden strips, screwed together and on the main wooden framework. Almost all the walls are removable (because just screwed as explained above). To do this, the baseboards are also screwed. Many elements are removable (you just have to lift the cupboard doors (made of 3 wooden folds) to recover them and take them to another project). The parquet floor as well as the cladding is pointed (point 1mm diam.) only in the tongues to be able to recover at least the wood. The insulating sheet follows the same pattern as the rest. Except in case of obvious impossibility of mechanical link, everything is under this format.

Specificities linked to new materials :

The wood frame of the house as well as the siding are new. The carpenter got the wood from a nearby sawmill (I don't remember the details). Concrete was used (in the right places) to maintain the land at the foot of the house and to become a workshop storage space. It was used as a base for the wood frame. Originally, techno-piles were considered but the slope of the land is so steep (16m difference between the top and bottom of the land) that this solution was abandoned.

Moreover, the house has been insulated with ISONAT & STEICO wood wool mix. The roof is in steel tank.

Environmental assessment

Impacts avoided : water, waste, CO2 :

Outdoor facilities	2840.214264	31.81952695	6441.51221
Exterior fittings / Locksmithing - Metalwork	0	0	0
Carpentry	1161.906667	18.58066	1008.333562
Partitions	0	0	0
Coverage	0	0	0
Roofing / Exterior fittings	0	0	0
Lighting	671.7746124	4.419368699	719.2832713
Safety lights	0	0	0
Climatic engineering equipment	0	0	0
Electrical equipment	20.72221888	1.270485753	32.06175904
Facades	0	0	0
False ceilings	0	0	0
False floors	0	0	0
False ceilings	1282.759658	19.96520344	1899.93657
Structural work	0	0	0
Sanitary installations	196.3616837	1.79894275	144.7462377
Insulation	0	0	0
Exterior carpentry	1436.725045	13.95544533	1524.253577
Interior carpentry	169.335	4.227245667	454.1590882
Furniture	1696.350985	638.8669183	1437.140234
Paint	16.74170246	0.446296335	15.85387955
Plumbing	74.85	1.01805	199.9663638
Floor coverings	47.56106948	10.1588978	98.0695322
Floor and wall coverings	0	0	0
Wall coverings	0	0	0
Building security	0	0	0
Locksmithing - metalwork	49.98493717	0.619533229	32.94360732
VRD	0	0	0
	Avoided CO2 (kg)	Avoided water consumption (m3)	Avoided waste (kg)
TOTAL	9665.287843	747.1465743	14008.25989

The reuse operation saved the equivalent of 77322 kilometers traveled by a small car, or 88 Paris-Nice trips, 4981 rectangular bathtubs filled with water and 28 years of household waste of a French person.

In the calculation of the avoided impacts, I could not count :

• the stove and its floor plate ;
• the complementary elements to the exterior work (screws, ropes, etc.) ;
• some furniture such as the shower room chest of drawers, the bed, the sofa and all the other small pieces of furniture / decorative elements of the cabin.

And I counted the 100 m² of wood panels inside walls and ceilings in the category of false ceiling reconstituted wood (for lack of another more suitable category). Also, I counted the 85u of cleats and the 40 ml of pinthes under the category wood frame (for lack of another more adapted category there too).

Reproductibility and Innovation

The owner, the architect and the project manager being one and the same person, I must admit that it greatly simplified the game of actors. It only remained to convince the companies, which, once informed did not slow down the company, without feeding it either.

On the storage side, as previously mentioned, the storage of the joinery was done at the carpenter's. For the rest of the materials, they were stored directly in the workshop space of the building, the first space built. It should be kept in mind that the self-construction that followed the delivery of the building to the companies took two years. This long period of time allowed us to continue sourcing materials as the construction progressed. This long time also allowed us to take the time to feel the terrain, to capture the winds, the way the exterior vegetation evolves and to refine the design at the same time as the construction. This is an invaluable gain for the quality of the project (which self-builders know well).

As for the sourcing of materials, I was in charge of that. This allowed creative back and forth with the design part and allowed to adapt the project to the various "finds". This design around the already there is alive and dynamic. It is an additional element of context that nourishes the project in the same way that the specifications or the site can be. The important thing is to keep the macro vision of the project in mind throughout this back and forth. To illustrate this exercise, the example of the joinery is obvious since it had an impact on the façade and therefore on a potential modification permit. Some of the joineries brought the idea of large fixed bays and a more continuous panorama on the hillside. Each selected joinery brings with it its history and aesthetics. It shapes the project.

The insurance brake, on the joinery in particular, is obvious. The installer of the woodwork wished to exempt himself by noting on his invoice that he had not supplied the woodwork. I think that this note has no value because he knows the site. Other than this point, we did not investigate further. I simply accepted the risk I was taking by not having insured millwork. As for the other materials, the fact that we are in individual housing relieves us of many questions of this type. Switches and sockets, for example, do not need to be new. 

As far as communication is concerned, I share more and more about this project, especially since the article about the ecological house which got very good feedback. The reuse trainings and interventions with public and private actors that we animate with Re.Source Réemploi allow these times of restitutions. I communicate regularly on this project (and more widely on the practice) within the network of the Beavers as well as in that of VAD, and still soon in Eurobois in June 2022 and with the CAUE on October 26 & 07, 2022.

With my colleagues, we are thinking of expanding this feedback on other projects for which we have the design and project management in the context of our architectural practices, and for which reuse finds its place. We are enthusiastic about the REX exhibition/publication format.

Economic assessment

• Total cost of reuse : 7 056 €
• Cost of reuse in percentage of the operation : 10 %