Contractor

Name : Commune de Nazelles-Négron

Contact : Jerome.mardon[at]nzn.fr

Construction Manager

Name : 180°

Contact : Evelyne MOREIRA - e.moreira[at]180degres.net

Stakeholders

Function : Company

FCA

F.Blancher - contact[at]fca-touraine.fr / 02 46 65 08 20

Thermal insulation from the outside - Coatings

Function : Company

SARL BOUGEARD

M.BOUGEARD - chamier35730[at]gmail.com / 02 99 88 84 71

Façade thatched

Function : Company

PEYON

G.SEGUIN - contact[at]peyon.fr / 02 47 30 69 69

Exterior woodwork and interior woodwork

Function : Thermal consultancy agency

EFFILIOS

contact[at]effilios.fr / 05 49 03 22 86

Function : Other consultancy agency

DUPIN

bejm[at]orange.fr / 02 47 37 49 50

Building design office

Function : Structures calculist

Impact acoustic

contact[at]impact-accoustic.com / 01 39 62 08 65

Function : Others

Atelier Atlante

atelier.atlante[at]gmail.com / 09 65 20 06 32

Grounds

Energy consumption

• Primary energy need : 93,17 kWhep/m².an
• Primary energy need for standard building : 168,96 kWhep/m².an

Calculation method : RT 2012

• Initial consumption : 229,70 kWhep/m².an

Envelope performance

• Envelope U-Value : 0,60 W.m^-2.K^-1
More information :

Various bio-based materials and techniques of implementation enter into the renovation of this building.
The extension for the creation of the dressing room of the theater has been designed wood frame insulated by wood fiber (Pavaflex).
The insulation of the existing facades (3.7 K.m² / W ≤ R) was achieved through two different and innovative techniques:
- Insulation Stubble on cleats wood and OSB fixed on concrete facade
- Insulation Fiber of wood on wooden frame fixed on frontage concrete + Coated lime (Pavaflex + Pavawall)
Low floor:
Insulation (3.0 K.m² / W ≤ R): Wood Framing and Woolen Glass Insulators and Woodwool Acoustic Floors (knauf organic)
Reinforcement of the horizontal metallic support structure by beams of wood support of a grid of wooden cleats. The glass wool is placed above the wooden cleats and the underside is covered with panels of acoustic wood wool and lime panels forming a colored checkerboard.

Joinery wood / aluminum (Uw ≤ 1.3 W / m².K and 0.36
The treatment of acroteria was a particular point.
In anodized aluminum, the width and fallout have led to the manufacture of custom pieces to cover sometimes stubble, sometimes wood fiber. The width could reach 700mm and the fall 300mm on the stubble. Rigidizing legs have been implemented to prevent wind resistance.

Systems

Heating system :
• Condensing gas boiler
• Water radiator
Hot water system :
• Other hot water system
Cooling system :
• No cooling system
Ventilation system :
• Double flow heat exchanger
Renewable systems :
• No renewable energy systems

Urban environment

The sociocultural center of Val de Cisse is located at the exit south of market town of Nazelles-Négron in the heart of a park of 10 hectares crossed by Cisse with many natural water points. It is located in a perimeter of protected sites under the UNESCO heritage and in the perimeter of protection of the historic monuments of the castle of Nazelles and the parish church of St. Pierre de Nazelles both registered MH. As such, the project was submitted to the architect of the buildings of France. Originally, this building was identifiable by its sharp contrast with its environment. Like the previous architects, the design team wanted to make it recognizable by its exceptional side and architectural curiosity, but especially reflecting the image of this town whose beliefs of respect for the environment marked the mandate in a determined way the mayor and his elected officials. The plot is part of a deep landscape environment, combining plain bocage, wood and many water points and more broadly along the Loire. The socio-cultural center is sandwiched between a water reservoir, a pond and a la Cisse river.

The project has also integrated the reconstruction of the ground under the building in compressed sand (outside the MOE market), repair of limestone slopes - regional stone - around the main entrance, renovation of the forecourt and the lighting (off-street lighting). MOE). Creation of a protected access of bad weather in under face.

Product

Product category : Finishing work / Partitions, insulation

Various bio-based materials and techniques of implementation enter into the renovation of this building.
The extension for the creation of the dressing room of the theater has been designed wood frame insulated by wood fiber (Pavaflex).
The insulation of existing facades has been achieved through two different and innovative techniques:

- Insulation Stubble on wooden and OSB cleats fixed on concrete façade: The peripheral activity rooms have been requalified using vertical thatch. Concurrently assuming the roles of insulation and finishing, this unprocessed natural product has been implemented for the first time in France in renovation applied on concrete facade. It offers a thermal mantle and assumes its share of acoustics.
We adopted the establishment of a wood frame between the outgrowths of the cells to fix the stubble support OSB25mm. Camargue reed boots are fixed using stainless steel cables, screws and rods thanks to the ingenious tools manufactured by the thatched cottage. The air space was blocked at the top and bottom of the façade as well as around the joinery by wooden battens reinforced by the application of the acrylic foam BB flex. The singular points such as the rounding of the columns, the connection with the acroterium, connection with the ITE, connection with the wood fiber plates / lime of the underside have been treated meticulously.

- Insulation Fiber wood on wood frame fixed on concrete facade: The distribution areas and technical rooms are identified by a different technique, compressed wood fiber with a lime plaster finish done with great professionalism by the company FCA Touraine which had to face many singular points.

Usually applied on wood structure these two materials (stubble and wood fiber) were to be placed on a facade prefabricated concrete with alveolar pattern with differences in thicknesses of more than 240mm.
We adopted the establishment of a wood frame between the outgrowths of the cells to fix the stubble support OSB25mm. Camargue reed boots are fixed using stainless steel cables, screws and rods thanks to the ingenious tools manufactured by the thatched cottage.

The air space was blocked at the top and bottom of the façade as well as around the joinery by wooden battens reinforced by the application of the acrylic foam BB flex. The singular points such as the rounding of the columns, the connection with the acroterium, connection with the ITE, connection with the wood fiber plates / lime of the underside have been treated meticulously.

The M3 stubble classification required fire tests. Models were made by the thatch house and submitted to CSTB. Despite the positive tests, the technical controller did not follow.

Fiber: The biggest challenge the team had to face was the installation of the wood fiber insulation. The fixing on masonry being the subject of a technical opinion the implementation recommended has been respected. But the particular configuration of the existing honeycomb façade led to point thicknesses of insulation of more than 540 mm that can not be screwed.
A wood frame lined with soft wood fiber and rigid compressed wood fiber plates screwed to the frame were put in place. The company has conducted numerous tear-off tests to confirm the strength of the system. Considered as a non-routine technique, the system was not insurable. The client has confirmed the installation technique despite the negative opinion of the technical controller and subscribes a particular damage insurance. The 6 months long administrative procedures led to construction delays that the town hall assumed.

Product category :

Paints: vegetable type (Algo-Pro);
The floors: oak treated with oil;
Soft floors in linseed oil based materials, wood flour on jute frame (Marmoleum);
Fermacell gypsum partitions.

In perfect correspondence with the guidelines given by the contracting authority and the state of mind of the 180 ° agency

Construction and exploitation costs

Additional information on costs :

Renovation fee: 2 003 047 € HT
of which extensions: 474 737 € HT
library layout: 64 263 € net

Indoor Air quality

The renovation based on biobased products has made it possible to minimize the emission of VOCs. A first sanitation project was undertaken. The building was undergoing severe water infiltration, accumulating many points of mushroom proliferation. All dubbing has been cleaned up by fungicide application and after ventilation of the premises, application of organic paints (Algopro).

Comfort

Health & comfort :

Actions were carried out on the entire building for accessibility (main entrance with elevator, modification of door widths, creation of a PM sanitary facility, accessibility of the stage and the library with height of shelves and adapted reception desks, etc.), a guide line was created on the forecourt and the access slopes to the main entrance were adapted.

The luminous surface was maintained except in the library where the technique of laying the chaumen required the concealment of two openings. On the other hand, the mullions being suppressed, and the quality of transmission of the acoustic glasses allowed us to increase the penetration of the natural light in all the premises. In the west windbreaks have been installed to minimize overheating.

The luminaires were all replaced by LEDs whose color was defined according to the searched ambiances, 2000 in the rest area of the library and 3000 in the activity areas. A maximum of occupancy sensors managed according to the external brightness have been programmed as well as progressive intensity reducers in the theater to manage the need for artificial illuminance.

A programmer controls the lighting of the edges of the stainless steel front so as not to function without need.

The lighting of the underface allowed to move away the squatters and thus to secure the center socioculturella night.

Acoustic comfort :

The internal acoustic treatment (weakening partitions: RA, tr≥69dB) and external (Weakening Joineries: RA, tr≥32dB) was part of the goal to reduce nuisance to the neighborhood, improve the working conditions of the librarian and the use of the auxiliary rooms more serene.

Daylight factor : Amélioration de l'éclairage naturel et artificiel et remplacement des menuiseries (Uw ≤ 1,3 W/m².K et 0,36

GHG emissions

• GHG in use : 10,00 KgCO₂/m²/an
Methodology used :

Regulatory calculation

• GHG before use : 34,00 KgCO₂ /m²

, ie xx in use years : 3.4

Life Cycle Analysis

Eco-design material :

Façade : Wood frame, wood fiber, thatch. The interior and exterior joinery is made of wood with labelMenuiserie 21 . The floors are made of PEFC certified oak parquet and natural linoleum based on wood and linen (Marmoleum Forbos). The partitions and doublings are in gypsum or Pavapan for the cloakroom. The insulation at the heart of the partitions unites the thermal and acoustic properties, consists of a complex of fiber blending hemp, cotton and linen (Biofib). The paintings are vegetable (Algo-Pro). By our environmental approach, we go well beyond level 3 in weight of bio-based with 3 families of materials.