Builders, construction teams and design practitioners can divert construction and demolition (C&D) materials from disposal by buying used and recycled products, practicing source reduction, preserving existing structures, as well as salvaging and reusing existing materials.
Designing a building to support adaptation, disassembly and reuse can reduce waste and extend its useful life, providing economic and environmental benefits for builders, owners, and occupants, and the communities. This practice can also avoid building removal altogether, and allows materials to be easily, cost-effectively and rapidly taken apart and directed for further reuse. By designing for adaptability, disassembly and reuse, design practitioners are finding new opportunities early in the design process to reduce environmental impacts, conserve resources, and reduce costs.
Disposal of C&D materials wastes resources and landfill space and results in pollution when new building materials are manufactured in their place. Deconstruction can be applied on a number of levels to salvage usable materials and significantly cut waste and reduce disposal. This can range from reusing an entire structure or foundation, to select assemblies and systems, to the careful removal of specific materials or items for reuse.
Scrap metal is recycled comparatively well because of its value. For less valuable materials, taxes and incentives are needed to either avoid fees from e.g. landfill tax, or gain benefits from government schemes. Due to these difficulties, most waste will end up in incinerators for energy recovery or sent to a landfill.
Buildings should be similarly designed so that elements can be more easily reused, repaired, recycled or recovered. This can be achieved by building with components created via 3D printing, prefabrication, BIM and modularity of buildings.
Recycling building materials can pose challenges depending on the material. Fortunately, steel, glass and gypsum board are all highly recyclable. Almost all (98%) structural steel will avoid landfill, whereas around 70% of rebar used to reinforce concrete will be recycled. Careful separation can increase this efficiency.
Designing to make separation easier at the end of a products lifespan and separating the materials as best as possible before sending to a sorting facility increases efficiency. Plastic resin numbers is one such way that the plastic manufacturer can indicate to the recycling facility the type of plastic used. Not all plastic resin numbers can be recycled, or require specific facilities to do so.
Offsite, modular-construction allows for easier selection of recyclable or sustainable building materials such as timber. Timber, also known as lumber, is mainly used for structural purposes in buildings and can last around a hundred years. As carbon is locked into the timber during this time, this helps to lower the embodied carbon of the overall project.
If all the concepts involved in a circular economy are applied, we will need to recycle and reuse less, but nevertheless the need will be there. But why would a construction company opt to use recycled materials, when a change to business as usual can introduce disruption to supply chains or design considerations?
The challenges lie in bringing projects from concepts to reality. Connected construction has great potential in this regard. With data guiding component material selection from the concept phase to realisation, building passports can become more mainstream, where there is visibility into the material selected, its history and an associated life cycle assessment for the project as a whole.
Recycling building materials is crucial to offsetting environmental factors but also can help save overall project costs. Although the process of sorting and saving can be time-consuming, the future of how we build new buildings and renovate existing ones will heavily depend on our ability to understand how to reuse old materials.
In general, using repurposed building materials rather than those made from scratch is typically cheaper than buying new ones. The cost of recycled and reclaimed building materials may vary depending on their age (such as items that are considered antique) and quality.
"}},"@type": "Question","name": "What are the environmental concerns of salvaged building materials?","acceptedAnswer": "@type": "Answer","text": "According to the Environmental Protection Agency, a small percentage of construction materials may be harmful to the environment if improperly managed, such as asbestos, polychlorinated biphenyls (PCBs), and lead.
","@type": "Question","name": "Where can I recycle building materials?","acceptedAnswer": "@type": "Answer","text": "Before planning any home renovation, construction, or deconstruction projects, take some time to plan where to dispose of the waste you'll produce. Most construction waste will be too large and heavy for curbside programs, so opt instead for an on-site dumpster through a company like Waste Management's Bagster, and ask about the recycling options when you order. Use the recycling locator from Earth911 to find out where to recycle construction waste locally.
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In general, using repurposed building materials rather than those made from scratch is typically cheaper than buying new ones. The cost of recycled and reclaimed building materials may vary depending on their age (such as items that are considered antique) and quality.
Meanwhile, the price of building materials is going up. But recycling brings big financial benefits. In Europe alone, adopting circularity principles could lead to huge savings, business opportunities, and operational improvements worth more than $2 trillion per year by 2030.
Using laser scanning and BIM data-management tools, an inventory of building materials can be digitized to create a 3D model, which then can facilitate the development of a digital twin infused with construction and operational data. This information is then analyzed in software, with input from a professional who can judge and identify which parts are ripe for reuse.
Construction materials such as steel, glass, lumber, bricks, concrete, tile, and gypsum board/drywall scraps can be recycled for use in new construction. Building fixtures and furniture can be reclaimed as well.
In some cases, recycled materials can make structures stronger, more efficient and less expensive to build than new materials. Charitable foundations have used plastic two-liter soda bottles to build shelters, schools and other buildings in impoverished areas. This school in the Philippines, for example, is built from old plastic bottles filled with adobe. They're inexpensive and about three times stronger than concrete.
Building an entire home out of recycled materials may not be feasible for everyone, but there are plenty of ways to incorporate salvaged or reused materials into a home's design. For example, stores like Habitat for Humanity's ReStore outlets sell donated building materials like doors, windows, cabinets and fixtures at discounted prices.
This home in Mumbai is built around a central courtyard and has a facade made from the doors and windows of homes that were demolished in the city, according to S+PS Architects in Arch Daily. The home makes use of other recycled materials, including 100-year-old salvaged stone columns, flooring made from the beams of old houses, fabric waste and waste slivers of cut stone.
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