The Beehive

Contractor

Name : Axanis

Contact : a.canu[a]axanis.fr

 http://www.axanis.fr

Construction Manager

Name : dauphins architecture

Contact : h.joinau[a]dauphins-architecture.com

 http://www.dauphins-architecture.com

Stakeholders

Function : Other consultancy agency

180 degrés ingéniérie

j.coeurdevey[a]180ingenierie.com

 http://www.180ingenierie.com/


environmental engeenering consultancy

Function : Other consultancy agency

eco étude

luc.floissac[a]gmail.com

 http://www.eco-etudes.com


life cycle analysis of the building + straw construction support

Contracting method

Other methods

Energy consumption

• Primary energy need : 56,00 kWhep/m².an
• Primary energy need for standard building : 67,80 kWhep/m².an

Calculation method : RT 2012

Envelope performance

More information :

Building a
Ubat = 0.471 W / (m².K) - Bbio = 29.7

Building B
Ubat = 0.357 W / (m².K) - Bbio = 27.4

Walls from the inside to the outside (filling straw bales):
Plaster earth (3 / 4cm), straw bale (37cm), wooden frame (beam I or 20cm full), high density wood fiber (16mm), rain cover, battens (27mm finish coating (ie nergalto + coated, wood cladding)

roofing
Building 1 / accessible roof terrace Rigid insulation (2x80mm) + vegetal fiber panel (80mm) (option of greening roof parts not accessible); Building 2 / pitched roof Cellulose wadding (220mm) + vegetal fiber board (48mm)

Low floor
Rigid insulation type expanded polystyrene (100mm) + hedgehog

Double glazed joinery

Thermal bridges
In most of the project, corresponding to the wooden structure envelope, the thermal bridges will be treated unusually well. Indeed :
- No integrated thermal cladding deck cladding because cladding facades like those coated will be fixed via battens to wood panels outside the insulation.
- integrated thermal bridges of the wooden wall: very reduced by the choice of wooden carriers profiled in "I", with thin core, instead of sections in solid wood.
- thermal bridges connecting intermediate floors wood / wood walls: very small because the floor joists do not cross the insulation, they come to end against a wooden wall.
- thermal bridges connecting low floors to solid ground / wood walls: the slab is not worn by the foundations, these bridges are treated by the installation of insulation throughout its perimeter.
- Thermal bridges for hanging the balconies and intermediate slabs of the "hollow tooth" north of Building A: very reduced by the choice of self-supporting structures (independent external structure secured to the facade by specific metal hooks).
On the other hand, in the small part of the project in concrete structure insulated by the interior (ground floor) building A) the thermal bridges encountered are classic, the only ones being attenuated being those of the junction / facades because the slats are not not in concrete but in wood with insulation for some and for others

More information

see attachment

Systems

Heating system :
• Wood boiler
Hot water system :
• Individual electric boiler
• Solar Thermal
Cooling system :
• No cooling system
Ventilation system :
• Natural ventilation
• Free-cooling
• Single flow
Renewable systems :
• Wood boiler
Other information on HVAC :

The two buildings have a significant amount of solar hot water production: 28.5m² for building A and 17.1m² for building B. However, this does not allow for surplus energy production and therefore to become a producer. energy…

In order to reduce electricity consumption and limit the impact of the building on the environment, we chose to equip the project with:
- glazing distributed so as to favor a good homogeneous irrigation of the premises in natural light: in order to reduce the use of artificial lighting;
- low consumption lamps;
- low consumption ventilation boxes;
- through housing typologies to maximize the efficiency of natural ventilation: in order to achieve passive summer comfort;
- common all external traffic: to suppress their consumption of ventilation and heating, and to limit their consumption of lighting at night time;
meters of consumption movable with posting in the lodgings in order to allow the occupants to follow them and to react in case of drift.

Urban environment

• Land plot area : 1 150,00 m²

On an urban site on the outskirts of the metropolis of Bordeaux, between large complex and suburban fabric, directly related to the realization of the Tramway, the project occupies a plot of 1150 m², mainly oriented, north and south, on a horizontal ground. "The hive" is a semi-collective program in participative and collaborative housing with shared and shared spaces, made of wood frame, straw filling, earth and lime rendering. Two buildings are developing on the parcel: the first contains seven units in street alignment. Its volume on four levels is animated by alternating volumes and materials, such as wood cladding and white lime renders on a concrete base. This building also contains the common room for the inhabitants of 80 m², open on the heart of islet. At the top is a common terrace overlooking the gable on street. The design is characterized by the multiplicity of possible routes, through many stairs and corridors that make traffic spaces a major and inhabited component of the project. The second building contains four dwellings at the bottom of the plot, the facades alternate between wooden cladding and lime plaster. Joineries are also in wood, some set with metal frames, others with wooden frames. The sloped roofs are insulated in cellulose wadding and have various coverings: wood cladding, steel tray, tiles. As for the walls, they follow for each dwelling the interior use, elaborated with the inhabitants: all the openings are particular and included in the custom wood frame.

Product

Individual pellet stove 6kW



Palazetti

800 018186

 http://www.palazzetti.fr/fr/


Product category : Génie climatique, électricité / Chauffage, eau chaude

Comfort

Health & comfort :

The software used for natural lighting calculations is ArchiWizard, which calculates the Day Light Factors achieved in the different buildings of the building. The type of sky considered is the Moon and Spencer covered sky normalized by the CIE.Thus, one can act on the openings of the bays, their position, their dimensions, or the factors of luminous reflection of the coatings to increase the visual comfort. In the housing the requirement is not as strong as in premises working but considering the diversity of activities that can spontaneously take place there we recommend aiming at least achieving a minimum FLJ of 1% in all points, except in humid rooms. Our optimization work has been done in this direction. In the end the optimized project includes a maximum of spaces irrigated in natural light homogeneously and with a day light factor greater than 1%.

GHG emissions

• GHG in use : 34,74 KgCO₂/m²/an
Methodology used :

Bilan Carbone (see attachment)

• GHG before use : 252,43 KgCO₂ /m²
• Building lifetime : 50,00 année(s)

, ie xx in use years : 7.27

• GHG Cradle to Grave : 1 989,43 KgCO₂ /m²

Life Cycle Analysis

Eco-design material :

Carbone : ADEME Nouvelle Aquitaine commissioned Laurent Castaignède from BCO2 to evaluate whether the participatory aspect of the project had an impact on its carbon footprint. "The impact study shows that La Ruche emits a total of 240 t CO2 of construction then 33 t CO2 / year of use, which reduces to housing gives respectively 22 and 3 t CO2 / log t. Thus, compared to average housing RT 2012, emissions are halved when considering those of construction (carbon sinks effect of wood) and those of perimeter RT (pellet heating). The most emitting stations are travel (in reality less than the Bèglois average considered here) and domestic electricity, then equal construction depreciation and consumption RT. In the end, according to the Carbone® scale, La Ruche obtains a silver medal, (score of 13.6 out of 20) Detail of the emissions of the construction Although little concrete was used on the project, this one impacts a lot the balance sheet, but is partially offset by carbon storage in the timber being used (this takes into account the movement and exploitation of wood, some of which comes from the North). Lot Carpentry and Wood Structures Exterior Wood Frame Walls, Intermediate Floors, Carpentry Waterproofing Frames, Traditional Carpentry, Wood Exterior Cladding, Wood Plywood Floor Structure, Patio Load Resumption, Wood Console, Carrying Elements, Wood Wall slitting, Interior partitions, Depergola fittings .........

• Wood mass: 26890 kg
• Mass bio-based materials excluding wood: 14964 kg
• Mass all materials: 303972 kg

Biobased products (including wood) represent 14% of the mass of the batch Carpentry and woodworking Lot Straw, plastered with earth / lime Straw walls, lime plaster, interior plaster

• Wood mass: 16835 kg
• Mass bio-based materials excluding wood: 31861 kg
• Mass all materials: 120563 kg / m²

Biobased products (including wood) account for 40% of the mass of this lot. Lot Wood interior and exterior joinery

• Wood mass: 476 kg
• Mass bio-based materials outside wood: 0 kg / m²
• Mass all materials: 4706 kg

Bio-based products (including wood) represent 10% of the mass of this lot. The wood used for this project is eco-certified PEFC or FSC for a quantity of 80 dm3 / m² SHON. Origin: local resources for solid wood and European for derivatives.