Ecoconstruction center of Beaulieu-lès-Loches

Contractor

Name : Communauté de communes Loches Sud Touraine

Construction Manager

Name : 180° Architectes

Contact : e.moreira[at]180degres.net

Stakeholders

Function : Other consultancy agency

SOCOTEC
Control

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Function : Thermal consultancy agency

EFFILIOS

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Function :

ARCABOIS

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Function : Environmental consultancy

C2A
02 47 67 94 26
Economist

Owner approach of sustainability

The design and realization of this development are meant to be in themselves demonstrators: the objective is to achieve the best thermal performance, using the maximum of agro materials, in a defined budget. The choices made by the project manager have been strongly argued, to facilitate reproducibility on other similar sites, and especially to illustrate, within the framework of the museography associated with the site, the problems related to the efficient renovation of buildings. In addition to MBS (Raw and assembled wood, rapeseed and sunflower aggregates, TrioBioFib panels, Chanvribloc), other healthy products were used: earth, marmoleum, fermacell coatings that are not included in the calculations. "Workshop" section of 470 m² is designed to accommodate experiments or training related to Ecoconstruction and agro-materials: it will be possible to isolate the locker room , designed to accommodate straw insulation, make insulating coatings on existing walls.

Architectural description

The chosen site is located in Beaulieu-lès-Loches, in an old industrial building, whose envelope has already been redone, with an architectural signature unchangeable.

The eco-construction pole has several vocations:

• Training space of 470 m2 to accommodate training organizations and manufacturers of agro-materials and expand the skills of craftsmen and their employees on eco-construction. 45m2 meeting room to welcome, inform, train and support craft companies.
• Space of awareness , information & support of the general public.
• Demonstration building of local know-how and agro-materials
• Reservoir of skills : coworking space & individual offices for entrepreneurs, project leaders and partners working on eco-construction and energy renovation.

This cluster is located in the heart of a tertiary center dedicated to the advice and support of businesses and residents alongside the Local Mission, The National Employment Service, Consular Chambers, etc. Rather than constructing an exemplary building from zero, the eco-construction division has been set up in an old industrial building that has already been partially rehabilitated, which better symbolizes the built park on which it is necessary to work within our territory.

Energy consumption

• Primary energy need : 92,00 kWhep/m².an
• Primary energy need for standard building : 92,00 kWhep/m².an

Calculation method : RT 2005

Breakdown for energy consumption :

The heating requirements represent 15 kWhep / m2.an

• Initial consumption : 1,00 kWhep/m².an

Envelope performance

Users' control system opinion :

Wall performance:

• Peripheral walls: 0.268 W / m2K
• Inner walls: 0.319 W / m2K
• Roofing: 0.099 W / m2K
• Low floor (on crawl space): 0,222 W / m2K

Systems

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

Life Cycle Analysis

Eco-design material :

Materials used:

• Structure: wood frame & wood cladding
• Insulation: cotton, linen and hemp, rapeseed granulate

Quantities implemented:

• Total mass of MBS used: 98 kg / m2
• Mass out of wood work and development: 78 kg / m2

Experience "rapeseed":

• Insulation "attic lost" by insufflation of rapeseed aggregates grown and processed locally (3 km from the site)

Detail :

• Renovation of the peripheral walls by providing thermal and acoustic insulation in panels made of cotton, linen and hemp
• Inner walls: solid wood structures braced by fermacell. Filling of frames by cotton wool, linen and hemp (Trio BioFib) or by hemp bricks (Chanvribloc) coated earth.
• Low floor: rot-proof insulating solution: cork aggregates caisson system with vacuum underneath for aeration, possible drying (possibility of pumping in case of flood) and passage of networks (evacuation of water, strong and weak current arrivals). Description wooden chests: Jura fir beams + OSB water repellent + Membranes by vapor and airtightness + Granule of cork Covered with a chestnut parquet solid in the home, marmoleum on reattachment in offices and tiling in sanitary

Product

Biofib'Trio
biofib'

Product category : Finishing work / Partitions, insulation

Biofib'Trio is a unique alliance of hemp fibers, cotton and linen, offering exceptional thermo-acoustic insulation. The semi-rigid panels Biofib'Trio (available in thicknesses from 45 to 200 mm) or rollers, are specially adapted for an ecological insulation and "any comfort" of the habitat, with thermal performances certified ACERMI.

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Block of hemp
chanvribloc

Product category : Finishing work / Partitions, insulation

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Construction and exploitation costs

• Total cost of the building : 437 090 €
Additional information on costs :

Costs are without land and prior study

Urban environment

The old rehabilitated industrial building is located a hundred meters from the church, along the banks of the Indre. It was therefore essential to maintain its original appearance despite its low architectural value. The woodwork present already referred to a hall located just next to an old mill located 50 m. The environment is that of an immediate periphery of village heart with a narrow street separating the building from another building built at the same time.

Parking spaces

A parking of fifty places is present in the immediate vicinity. it can accommodate people coming in training, without blocking the parking of people wishing to go in the heart of the village.

Building Environmental Quality

• Building flexibility
• energy efficiency
• products and materials