Sustainable Materials for Green Building

Sustainable Materials For Green Building

Is Your Green Building Actually Green? A Scorecard for Sustainable Materials

By Lou Farell

 

Green buildings have gained popularity as the building sector strives to become more sustainable and resilient. However, greenwashing is on the rise: marketing exaggerates a project’s actual environmental benefits to appear eco-friendly. Sustainable materials are the key to authentic, eco-friendly construction. The building industry must move beyond buzzwords and critically evaluate the components it uses.

Why Building Green Matters

A 2023 United Nations Environment Programme report states that the built environment accounts for 37% of global emissions, making it the most significant contributor to greenhouse gases. The sector has focused primarily on reducing the operational carbon dioxide (CO2) emissions of buildings, such as those from heating, cooling, and lighting.

Over the next few decades, experts anticipate a decrease in operational CO2 outputs from 75% to 50%. Yet, embodied CO2 emissions derived from the design, production, and allocation of construction materials remain high.

Construction and demolition also account for a significant share of waste streams in the United States. The U.S. Environmental Protection Agency reports that the industry accumulated 600 million tons of debris nationwide in 2018, more than twice the amount of municipal solid waste generated.

4 Sustainable Materials Transforming Green Building

Sustainable materials are nonnegotiable in revolutionizing the built environment. Keeping a scorecard of these most innovative components ensures that construction teams implement them effectively and deliver on their environmental promise.

  • Bio-Based Materials

Bio-based matter — such as cork, bamboo, and hempcrete — is a sustainable alternative to traditional construction materials. Hempcrete, in particular, mixes hemp hurd and a lime-based binder. It is a fast-growing material with superior thermal and humidity-regulating properties, sequestering more CO2 than it emits during production.

Construction teams can utilize hempcrete and other bio-based components to create breathable, efficient insulation and non-load-bearing walls. This effectively reduces the building’s energy consumption and allows it to store carbon.

  • Mass Timber

Mass timber is proving itself as one of the most sustainable materials in green construction. It employs powerful, engineered wood, such as glue-laminated, nail-laminated, mass plywood, and cross-laminated timber, to form structural systems for mid- and high-rise projects.

This option allows for the responsible sourcing and manufacturing of mass timber products as an eco-friendly alternative for construction. Its use is essential, considering non-wood building and infrastructural components generate 15% of CO2 emissions worldwide.

Greater utilization of mass timber in structures also promotes healthy tree growth by removing unfavorable woody plants from forests. Studies also indicate a 13% to 26.5% reduction in CO2 production when substituting mass timber for traditional steel and concrete materials in mid-rise buildings.

  • Salvaged and Reclaimed Parts

Incorporating salvaged and reclaimed wood and steel is essential to empowering a circular economy. As a green construction practice, it diverts waste from landfills and gives it a second life in a new structure. In turn, this alleviates landfill pressure, conserves natural resources, and decreases CO2 emissions from having to manufacture new materials.

Architects and civil engineers are adopting recycled concrete and asphalt (RCA), along with advancing 3D printing technology to customize sustainable materials for their projects. RCA’s performance is comparable to that of conventional materials, but it costs less and has a much lower environmental impact. For example, the ECOARK in Taiwan features a wall made from 1.5 million polyethylene terephthalate bottles, which are lightweight and well-insulated.

  • 3D-Printed Construction

3D-printed construction relies on automation and robotic arms to fabricate structural components. The method is highly efficient and can reduce waste by 60% and accelerate construction by 50% compared to traditional methods. It also prioritizes geopolymer concrete and recycled aggregates over conventional concrete.

The technology enables industry professionals to create algorithm-optimized geometric forms exuding excellent strength with as few materials as possible. Its precision makes it a reliable option for fabricating unique building envelopes and customized elements.

Evaluating Sustainable Materials

Professionals must thoroughly evaluate sustainable materials and their potential uses in an effort to achieve greener buildings. Conducting a life cycle assessment ensures they consider their total impact from raw material extraction to manufacturing and transportation. Likewise, they should also evaluate the operational use and end-of-life potential.

Third-party certifications — for instance, from the Forest Stewardship Council — help verify the environmentally friendly claims. Labels are especially important when seeking Leadership in Energy and Environmental Design building certification.

Purchasing locally sourced materials also significantly reduces CO2 emissions by eliminating the need for extended transportation. Of course, the best material option depends on a project’s location and application.

Building a Better Tomorrow Using Smarter Materials

Creating a sustainable structure requires professionals to look beyond basic designations and assess the actual environmental performance of materials. Wood components sequester more CO2 than other substances, while the insulating properties of bio-based materials make them a smart option for transforming the building sector.

Innovations in 3D-printing also significantly improve waste management in construction and demolition, as does the utilization of salvaged and reclaimed materials. Approaching each project with a fresh perspective and a tailored blueprint will help professionals build resilience for the future.

Lou Farrell

Lou is the Senior Editor of sustainability and technology for Revolutionized Magazine. He has over 4 years of experience crafting compelling articles on a variety of topics, from energy efficiency trends to eco-friendly construction. He loves to write, and is passionate about sharing his knowledge with others.