LCA Construction Bois completes its 4th energy renovation project for a school

After 3 energy renovation operations, LCA has once again responded to the call for tenders from the Department of Loire-Atlantique for the modernization of a college, that of Galinet in Blain.

For 9 months, Les Charpentiers de l'Atlantique deployed their know-how on the coat walls, wood cladding and ITE (External Thermal Insulation) part with the red thread, the reduction of the energy consumption of the building. 'establishment.

For Edouard Bonnin, Managing Director LCA Construction Bois: “We are very happy to refine our expertise in the energy renovation markets with this 4th achievement. We are more than ready to meet government expectations regarding the tertiary decree. »

Fight against thermal strainers

The number of "thermal sieves" in France in 2021 is estimated at nearly 5 million and this, not counting public buildings, the tertiary sector and shops, schools built in the 60s are very energy-intensive and the Collège du Galinet , built in 1969, is no exception.

This thermal renovation project (global rehabilitation) is therefore fully in line with the news of the Climate Law and the new standards in terms of thermal insulation. Indeed, the energy rehabilitation work on the building and the systems put in place make it possible to limit heat loss and therefore reduce energy consumption by more than 60% compared to the initial state.

The programmatic objective was to achieve, at a minimum, the "BBC renovation 2009" level as defined by the decree of September 29, 2009 for buildings whose facades and roofs are insulated during the works (buildings A, C and G). It is therefore a question of obtaining, after works, a conventional coefficient of consumption Cep ≤ Cepréf-40% according to the ThCE-Ex calculation rules. The work carried out on the College of Galinet now allows the labeling of buildings A and C in BBC Renovation.

Improving user comfort through proven know-how

The thermal renovation project (global rehabilitation) of the college, the reorganization of the catering area as well as the extension of the dining room took place on an occupied site, with all the problems that such an organization represents (management of site-related noise pollution, user safety).

The works consisted in the installation of a global facade system. The latter includes the cladding of the facades on their exterior face -composed of wooden boxes prefabricated in the workshop integrating the insulation- and the new aluminum exterior joinery.

The caissons were assembled on all the facades and covered with strips of wood cladding (locust essence) on the ground floor and metal cladding in bronze tones on the upper floors. The staff accommodation, located at the entrance, has been treated differently with metal cladding in scales in bronze tones.ze and champagne.

The composition of the facades finally deploys a solar strategy in the form of a filtering facade with the implementation of trunks planed in locust. This device evokes a forest and natural universe, in adequacy with its environment since the establishment is near the forest of Gâvres. The staging is playful, it seeks to provoke emotions, it draws on everyone's sensitive experience.

The aim of this renovation is to reduce the establishment's energy consumption costs, but also to improve the thermal comfort of users, whether in winter or summer.

The strong heat waves experienced in recent years involve a risk to the health of children and can also cause difficulties in concentration and organization in their learning.

The operation delivered for the start of the school year in September therefore allows the 735 students and staff to enjoy their first winter in a renovated and welcoming college.

Building sustainable and responsible

From the choice of species to the origin of the materials, this thermal renovation project aims to be consistent across the board.

The choice of wood fell on Robinia (acacia). It is one of the rare European species admitted naturally in class 4, in its raw state and without any chemical treatment. A rot-proof material which is therefore perfectly resistant to the different types of attacks that can affect the wood (insects, parasitic fungi, bad weather, etc.). This species is therefore ideally suited to exterior works which are subject to humidity and attacks linked to the environment and the weather. Its longevity is 25 to 40 years when it is in contact with the ground and can even go up to 80 years if it is not in direct contact. In a dry environment, it can reach 500 to 1000 years.

Finally, in addition to its intrinsic properties, this essence has another advantage, very useful in view of the news: its local availability. Indeed, the forests of the Great West are very rich in acacia.