Tuesday, December 30, 2025
New research reveals that timber insulation systems can provide superior acoustic performance and significantly lower carbon emissions than steel or concrete. George Edgar, an acoustic engineering specialist based in New Zealand, presented these findings at the Sixth Joint Meeting of the Acoustical Society of America and the Acoustical Society of Japan, held in Honolulu, Hawaii. His analysis highlights the environmental benefits and acoustic advantages of timber in wall and floor assemblies, suggesting it could revolutionise building practices.
Edgar’s research compared the sound-insulating performance of timber, steel, and concrete systems, alongside their global warming potential (GWP), which measures emissions generated during the manufacturing phase. “The primary factor that influences GWP in the manufacturing phase is the amount of energy, and therefore carbon emissions, required to produce the material,” explained Edgar. Concrete and steel are far more energy-intensive to manufacture, resulting in higher GWP values. Timber, by contrast, requires less energy to produce, making it a more environmentally friendly option.
Edgar’s findings come at a critical time when architects and construction professionals are under increasing pressure to balance sustainability with performance. Modern buildings are expected to minimise both operational energy use and embodied carbon – the carbon emissions generated during the manufacturing of materials. At the same time, there is a growing demand for improved acoustic comfort in buildings, as noise control is now recognised as a key factor in health, productivity, and well-being.
The study, which included a comparison of wall and floor systems, found that timber-based systems outperformed steel and concrete not only in terms of GWP but also in acoustic performance. For example, timber systems in walls delivered superior sound insulation compared to steel stud systems, even when additional linings were required to meet the same sound insulation targets. This suggests that timber may be a viable, sustainable alternative to steel and concrete, even in more complex building designs.
In floor assemblies designed to achieve the same level of sound insulation, the emissions associated with concrete systems were significantly higher than those of timber-based solutions. These results indicate that timber could offer both acoustic and environmental advantages for a wide range of building applications, including residential, commercial, and institutional structures.
Edgar’s findings underscore the growing potential of mass timber as a key material in sustainable construction. He is currently working on the Te Manawataki o Te Papa project in New Zealand, one of the largest mass timber projects in the country. The building, which includes a hybrid structure of mass timber, has been designed to optimise both sound insulation and low embodied carbon. However, as Edgar points out, even mass timber projects face challenges in terms of acoustic performance. The design of the Library and Community Hub involved adding sound insulation and absorption features to ceilings in enclosed spaces to address these challenges.
Despite the promising results, Edgar noted that research on the intersection of acoustics and carbon emissions remains limited. He hopes that his work will inspire designers and acoustic consultants to consider both performance factors from the earliest stages of a project. “As acoustic consultants, an awareness of the GWP associated with the design solutions we specify can help us to make a positive impact on our environment for generations to come,” Edgar said.
The findings also highlight the need for more research that combines both acoustic and environmental considerations in the design of building materials. This dual focus could lead to innovations in construction practices that achieve higher performance standards while also reducing the carbon footprint of the built environment.
Timber’s acoustic performance and lower carbon emissions make it an attractive choice for architects and builders who are committed to sustainable construction practices. While the demand for improved sound insulation continues to grow, the environmental impact of materials used in building design is also becoming a critical consideration. Timber offers an ideal solution, providing both excellent acoustic qualities and a much smaller environmental footprint compared to traditional materials like steel and concrete.
The implications of this research are far-reaching. As the construction industry faces increasing pressure to meet sustainability targets and address climate change, timber-based solutions could play a crucial role in reducing the environmental impact of buildings. The results of Edgar’s study encourage further exploration into the acoustic and environmental benefits of timber and offer a glimpse into the future of sustainable construction.
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Tags: carbon emissions, mass timber, Sound Insulation, sustainable construction, timber insulation, woodworking and processing, woodworking industry
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