Caps et Marais d’Opale Regional Nature Park ACCOMPANIED SELF-RENOVATION FEEDBACK FROM 2019 SITE AUDEMBERT South façade of the house. What is Auto-Réhabilitation Accompagnée (accompanied self-renovation - ARA)? ARA is an assistance tool enabling owners to renovate their own home or building in accordance with industry standards, with the support of a professional trained to supervise the work. This arrangement concerns the inhabitants of Caps et Marais d’Opale Regional Nature Park (Park), who wish to renovate their house using environmentally friendly materials. The objective is to make the home more energy efficient. In order to ensure people take advantage of this arrangement, the project is partly participatory. A team of volunteers, keen to learn some renovation techniques, comes to give a hand. For a few hours, the site becomes a place for interaction, learning and fun. This sheet shows an example of the work conducted as part of the accompanied self-renovation of a detached house built in the 1970s. Site description TOtaL ENERGY EFFICIENCY Date of construction? 1970's. Techniques and materials RENOVatION OF A DEtaCHED n Area? 150m² of roof HOUSE n ARA work? Internal thermal insulation n Project duration? Around 1 month, Internal thermal of lofts filled with cotton wool, with 8 days of ARA support. insulation of lofts installation of the airtight membrane n Who is involved? Institut des Mines et filled with cotton and covering. Télécom (IMT) of Lille-Douai (Mohammed- wool n Where? In Audembert Hichem Benzaama, Lala Rajaoarisoa and a team of students); Sylvain Huret, architect, architectu- ral analysis of the project; Florent Hubo (Living in an Ener- gy-Plus House, HMP SAS), guide/ craftsman. Installation of the airtight membrane ACCOMPANIED SELF-RENOVATION The owners' view An essential step: the overall project review Work executed under an ARA It is essential to plan the project as far in advance as possible. The Park had Work executed outside an “The professional guide was really several conversations with the owners to determine their needs, deadlines and 4 DAYS OF ASSISTANCE FOR COTTON 2.5 DAYS OF ASSISTANCE FOR ARA patient, helpful and willing to motivations. WOOL LOFT INSULATION AIRTIGHTNESS Work was carried out directly by the listen through the ARA project, A comprehensive assessment of the house is then conducted to identify any owners or external agents: flaws in the dwelling and thus adapt the work. The owners and guide Humidity and airtightness are managed which helped us to avoid making = Roof repairs (replacement of tiles During the work, the project guide showed how to execute some of the most firstly installed an initial layer of by the installation of a membrane, any mistakes.” and installation of a rain screen), delicate work (cross-coat installation and attachments of insulation purlins, insulation (10cm), then applied a which also serves as a variable = Replacement of carpentry, installation and attachments of the airtight membrane) correctly and in accor- second, perpendicular, cross layer of vapour barrier. Thus, in winter, the = Creation of a stairwell for access dance with industry standards. The guide was very easy to get in touch with in 20cm, to prevent any thermal bridges, vapour-barrier membrane prevents to the upper floor, the event of any problems. giving a total thickness of 30cm (total humidity from getting into the loft. In = Demolition of the chimneys at thermal resistance R = 2.55 + 5.10 = summer, it ensures drying towards the the two ends of the house, with the Description of the Instrumentation with 7.65m²K/W). interior. Excess humidity evaporates central chimney kept, property thermal and humidity throughout the year, preventing any = Change of heating method (switch sensors by the IMT risk of mildew. At the time this house was built in team under the aegis from fuel oil to wood stove). the 1970s, modern equipment and of the SHINE European industrially produced materials made programme construction easier by moving away 1.5 DAYS OF ASSISTANCE FOR THE from certain construction methods INSTALLATION OF THE COVERING and only paying minimal attention to The type of covering chosen by the the consumption of the dwelling. The owners is to install plasterboard on houses are therefore not insulated, metallic profiles (or furring). This Difficulties encountered or poorly. The proportion of glass operation was executed as follows: surfaces has increased in compari- = Installation of hooks (some on the by the owners son with the older constructions, thus furring and others attached directly to «We encountered some problems making the shell of these homes still the rafters), in managing the site when we less energy efficient. The thermal The owner is supported and advised du- = Installation of horizontal furring, noticed that the covering and some bridges are numerous. = This project forms part of a European programme called SHINE, whose goal ring the installation of the insulation by a Installation of the insulation, components of the roof structure had The energy performance analysis professional builder. = Installation of the vapour-barrier to be redone to integrate a service (DPE) confirms this: it estimates is to reduce the energy consumption of homes by involving the residents. (See supplement: “The SHINE European programme in Les Caps et Marais membrane, door. However, the flexibility of the energy consumption of 310kWhPE/ = Installation of plasterboard. professional guide was a great help. m²/year (category E) and green- d’Opale Regional Nature Park”) house gas emissions of 93kgCO2e/ As part of this programme, the owners were able to benefit from an architectural Mobilisation is a crucial factor to take m²/year (category G). analysis financed entirely by the Park and a report produced by the Institut des into account before embarking on Mines et Télécom de Lille-Douai, highlighting points of the shell that require mo- this plan. You must be sure of your nitoring, using sensors installed prior to the work. Other sensors will be installed availability throughout the project.» after the work, which will make it possible to observe improvements in terms of the thermal performance of the house. ARA budget The question of Installation of the airtight membrane responsibilities For the work: When the project has been properly The guide’s defined before the start of the work, the 8 days of technical support from a craftsman €4,374, inc. VAT various parties sign an agreement. This view 80% borne by the Park (€3,499.20, inc. VAT) includes: = a commitments contract which esta- «The assistance of a professional blishes the missions and obligations of builder on this project greatly Cost of materials €7,144.63, inc. VAT each party; reassured the owners. The ARA = Borne by the owners. a site contract which specifies the arrangement is an advantage, work to execute according to the ARA especially during the more arrangement, the schedule and the Total of €8,019.43, inc. VAT, to be borne by the owner. post-project maintenance advice, technical phases.» = a specific article on the insurance policies that should be taken out. The participatory stage: the site was opened up for one day to volunteers keen to learn green This is a guarantee of the correct execu- renovation techniques. Supported by the guide, Florent Hubo (HMP SAS), they were able to learn tion of the various phases of the project. about and implement the installation of cotton wool under roof slopes, in a fun environment. ACCOMPANIED SELF-RENOVATION Focus on .... Insulation of roof slopes with cotton wool Cotton wool is insulation which may be packaged in a roll or as a panel. It is made of 85% recycled cotton, 15% polyester binder and 1% core treatment (flame-retardant, anti-fungal and anti-bacterial). In addition to the thermal insulation of buildings, cotton wool also possesses acoustic properties. = Materials: cotton wool, framework used as a support for 3. Installation of the insulation the covering, variable vapour-barrier membrane, installation The insulation is placed accessories (adhesive and sealing glue) between the jambs and is = Equipment: measuring tools, cutting tools (saw, cutter), slightly compressed lengthways hammer, fixing equipment (nails, screws, brackets), to benefit from its spring effect. = Time: 8 days for the execution over an area of 150m² of roof The insulation immediately slopes by 2 people, returns to its original shape, perfectly matching the jambs =C ost: Cotton wool (around €13.25/m² for 10cm-thick panels), and thus preventing the risks of variable vapour-barrier membrane (€2.82/m² inc. VAT), double- thermal bridging. sided adhesive tape 20mx25mm to glue the joints to the edges The insulation strips may need of the underlays (€6.34 inc. VAT), sealing glue for attaching some adjustment to ensure they to rough or mineral construction components (€6.76 inc. VAT). fit perfectly next to each other. 1. Installation of framework 4. Installation of the vapour-barrier membrane (airtightness) The thickness of the jambs varies depending on the thickness of Attachment of the vapour barrier to the jambs using double-sided the insulation installed. adhesive tape, continuously across the entire surface. An overlap For optimal insulation, cross-coat installation is expected. of 50 to 100mm is preferable between the strips to ensure perfect airtightness. 2. Cutting the insulation The strips are then glued to each other and it is necessary to The insulation is cut to the distance between the jambs plus 2cm ensure that