SAINT-GOBAINLes Miroirs18, avenue d'Alsace92400 CourbevoieFRANCE
The building sector is far from being top of the class as regards sustainable development, it consumes an enormous quantity of resources and generates a lot of waste. Forty percent of global resources are used in the manufacture of materials, particularly sand for the manufacturing of cement. This sector alone produces 40% of the world's solid waste. Everyone doing construction work at home can easily realize this. A significant amount of material is wasted: more quantities than required, poor installation, difficult-to-access recycling centers, etc. And the manufacture of these materials is dependent on exhaustible natural resources.
One of the answers is to build in a different way. In this regard, Saint-Gobain offers many solutions for lightweight construction, which are genuine alternatives to traditional brick or cement-based mass construction, to provide very clear benefits in terms of decreasingly intense use of resources as well as reduction in greenhouse gas emissions, and many more possible uses of buildings, which are more flexible and easily adaptable to changing lifestyles or occupants.
Today’s challenge is to succeed in building or renovating more efficiently a greater number of buildings, with fewer materials, while at the same time reducing resource waste. The ecological and economic stakes are high.
In the face of this challenge, in 2015 Saint-Gobain worked on its Sustainable Resource Management policy. The aim is to promote the transition to a circular economy. This involves a three-fold thrust: having maximum recycled content in products, generating minimum work-site waste, recovering the remaining waste. Saint-Gobain set the target of reducing by 50% its unrecovered production waste by 2025 compared to 2010.
To support this approach, Saint-Gobain is developing tools in-house. SCORE, for example, facilitates the assessment of performance for construction products in accordance with sustainability criteria. It takes five categories of indicators into account, such as energy and climate, health and the circular economy. This helps to identify pathways to innovation, in order to develop new products that are more sustainable or to improve existing products.
Saint-Gobain also encourages entrepreneurial initiatives that share the logic of the circular economy and responsibility for the environment. In 2016, Marie Combarieu, formerly Digital Communications and Marketing manager at Saint-Gobain, created Ecodrop, an application and service for contractors. "I had an intuition. I quickly understood that contractors regard waste management as a complex and expensive problem."
To reduce materials waste, products need to be improved at the design stage: Thinking about materials by considering their uses before, during, and after, so that they can be adapted to the city of the future. Commitment to offering products with an extended lifespan for more sustainable construction. And replace old reflexes – manufacture, use, throw away – with new ones: reduce, re-use, recycle.
Diane Maffre, Sustainable Products and Solutions Manager at Saint-Gobain explains: “Taking the challenges of the circular economy into account in innovation is a response to the great environmental and climate challenges we are facing today. This more responsible approach aims to reduce our dependence on fossil fuels and non-renewable raw materials, and to consume more sustainably.”
With eco-design, Saint-Gobain seeks to make buildings more flexible and adaptable to allow straightforward customization, without wasting resources. According to Pierre-André de Chalendar : “The challenge is to build properly from the outset, without waste, and to consider dismantling from the outset, in order to facilitate a building being considered as a materials bank.” A few examples: the possibility of removing the glass from a window without having to remove the frame; walls or ceilings that are removable and easily reusable. Focusing on custom production also limits the amount of waste generated on work-sites, such as the Lean service offered by Placo, plaster boards pre-cut to the right size. And above all, reinventing uses for buildings to optimize them over time and make every transformation possible.
Saint-Gobain's subsidiaries have implemented new processes integrating the circular economy in all its dimensions. A case in point is the subsidiary Ecophon, which manufactures glass wool-based ceiling tiles and wall linings. Also in the area of glass wool, our subsidiary ISOVER offers 100% biosourced binders based on raw materials sourced from the sugar and cereal industries. We find another example farther downstream in the cycle, in the realm of waste recovery: the Point P network of construction industry outlets now manages 115 waste collection points, 11 of which are so-called "multi-flow" points, capable of receiving most of the waste generated by individual builders, whether it be plastic films, used paintbrushes, plaster or aerosols, etc. This project was set up in partnership with the Suez group.
In many countries, Saint-Gobain offers to recover waste from its clients. This allows waste from one client to become the raw materials of another!
In 2008, the Group created the first French recycling system for plaster-based waste. Currently, the plaster recycling system is used in 18 countries and is being adapted to tackle local issues. In France, nearly 50,000 tons of plaster is collected and recycled each year through the Placorecycling© service.
In addition to closed-loop recycling, we should also mention an example of "downcycling": in South Africa, Saint-Gobain Gyproc recycles plaster waste from its plants to convert it into fertilizer. A solution that, besides dramatically reducing volumes of waste, largely benefits local agriculture and food production. "We have assessed the best ways to leverage our gypsum waste and we now have a solution that minimizes waste and turns it into a key ingredient in fertilizers," says Elsa Lazenby, Environmental, Site Risk and Systems Manager at Gyproc.
Another initiative with ISOVER in its expanded polystyrene factory in Český Brod Czech Republic. A recycling centre has been set up there to receive various sources of used polystyrene, including both the waste generated by ISOVER's operations and the packaging used by its suppliers during deliveries by truck. The plant also collaborates with other industries. In all, 300 tonnes of waste can be recycled each year to produce new polystyrene, which represents 5% of the Český Brod site's annual production.
Glass wool has been the focus of a lot of attention through the Wool2Loop scheme, coordinated by Saint-Gobain Finland Oy in cooperation with fifteen industrial partners and research centres. The aim is to produce new materials from glass wool recovered from demolitions, using a geopolymerisation process. This involves heating the product in order to obtain, for example, so-called "polymer" concrete with a carbon footprint that is 80% lower than traditional concrete. Beyond this innovative treatment, the Wool2Loop project teams work upstream to optimise sorting at construction sites.
The circular economy is dependent on the way people consume, on infrastructures, and on the industrial framework but also on the legal context and the conditions under which waste is managed. For this reason, the Group adjusts its policy on a local basis, in close touch with each territory.