Myral webinar: preparing for environmental regulations in rehabilitation

The theme of this webinar was: “Building stakeholders, how to prepare for the arrival of environmental regulations in rehabilitation? »

Julien Bagnard (Myral), Pierre Laruaz (Isore Bâtiment) and Damien Cuny (Kompozite) discussed and answered relevant questions for 70 minutes with the hundred spectators present for the occasion. These participants also gave very positive feedback from the event proposed by the Myral group.

With the carbon neutrality objectives planned for 2050, the entry into force of RE2020 in new buildings and the fight against thermal sieves, the current context was conducive to the theme of "preparing for the arrival of environmental regulations in the sector rehabilitation”. The audience, made up of building stakeholders such as managers of construction groups, social landlords, communities and real estate development, architects, members of design offices, building technicians, representatives of industrialists and organizations in the sector, as well as specialized journalists, therefore responded.

The 3 experts present for the debate represented different links in the building rehabilitation sector, but they are also resources for contracting authorities and project managers in terms of working on the building envelope, taking into account the reduction of the carbon impact.

Julien Bagnard, development manager of the industrial group Myral, specialist in ITE, Pierre Laruaz, president of Isore Bâtiment, an expert in dry sector work on ventilated facades or cladding, and Damien Cuny, president of Kompozite, the aid platform to the design of low-carbon buildings, began the debates by sharing the journey of their awareness of environmental issues. They all three spoke about "their sensitivity to the considerable part of the carbon footprint of the building world" and the need to question themselves in the face of the urgency for all players to react, especially since the regulatory framework is changing.

The first labels announcing future regulations in the rehabilitation sector

For Damien Cuny, president of Kompozite: “Taking carbon into account in construction is new because the RE2020, which has just entered into force in new buildings, introduces this notion, and it is currently unique in Europe. On a building built in 2022, 60 to 90% of the carbon impact will come from materials, compared to 10 to 40% from energy, if we look over a period of 50 years. To succeed in the challenge of carbon neutrality in France by 2050, which is the objective set by the public authorities, there will be decreasing thresholds from 2025 and 2028. We are already seeing labels being renovated which are beginning to analyze the carbon impact of this type of project. These are the first steps to legislation as happened for the RE2020. So if we are not on an immediate timeline, it is almost certain that in the years to come there will be a framework on the materials and the energy saved. »

Despite the likely change in direction of rehabilitation sector regulations to move in the direction of RE2020, these issues do not yet appear to be the focus of concern.

For Pierre Laruaz, president of Isore Bâtiment: “We don't hear too much talk about carbon on construction sites. As much on energy, there is a real reflection which is engaged by the project owners and the project managers, but on the choice of materials and construction methods, awareness must still progress, even if we today talks a lot more about recycling and reuse. »

For Julien Bagnard: “We feel an increasingly strong expectation but it is often difficult to formalize and it is accompanied by a lot of received ideas. Because the subject of reducing the carbon impact and choosing solutions and systems is much more complex than it seems. You have to think pragmatically and without ideology. »

Learn to read carbon data, choose the right materials in the right places, prioritize your actions

A question from viewers, which came up several times during this webinar, concerning the renovation of facades, was: are biosourced materials the only solution to lower the carbon impact of rehabilitation? Here is the answer of the 3 experts:

“When you want to choose an interesting material, you have to think system and take into account the data of the facing, but also the carbon weight of the frame, which changes a lot of things, explained Pierre Laruaz of Isore Bâtiment. Not all materials are suitable for all projects. A biosourced insulation will naturally be better suited to a detached house than to a collective building in R+8 in a seismic zone for which the regulations are much stricter. Especially since the subject of fire risk on the facade reduces the number of bio-based solutions. »

So what advice should be given to building stakeholders to initiate their environmental (re)evolution?

For Damien Cuny: “Above all, you have to learn to read the carbon data and the calculation methods, in particular to have a realistic view of the lifespan of the product in relation to its carbon weight. This is what should guide the choices. »

For Pierre Laruaz: “It's choosing the right materials in the right places, taking into account the overall impact: system + installation. »

For Julien Bagnard: “The key is in the hierarchy of actions: understanding the impact of its products and their implementation, working on a realistic plan with clear deadlines and implementing actions that ultimately aim to massiveize energy renovation. »

Find the full webinar on YouTube.