Discover the future of construction with our comprehensive guide to mass timber. Learn about the benefits, design and engineering impacts, construction and manufacturing techniques, and sustainable attributes of mass timber. Explore real-world case studies and applications.
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Mass Timber, also known as engineered wood, encompasses an array of structural products that include cross-laminated timber (CLT), glue-laminated timber (GLT), nail-laminated timber (NLT), and laminated veneer lumber (LVL). Mass timber is engineered to be a strong, durable, and sustainable alternative to traditional concrete and steel construction. Because mass timber enables large, open spaces alongside low environmental impact, it is becoming increasingly popular for commercial; residential and multifamily; educational and community; and infrastructure and transportation projects.
Mass timber construction’s benefits include sustainability, strength, faster construction times, cost savings, and a natural wood aesthetic. It has a lower carbon footprint than traditional methods and provides better indoor air quality and acoustics.
Popular in European markets for over two decades, mass timber construction is shown to accelerate construction by up to 30 percent1. This efficiency is driven by the unique qualities of CLT and the CLT planning process.
Two of the most ubiquitous conventional building materials, concrete and steel, are among the most carbon-intensive to produce. Switching to lower carbon alternatives can significantly reduce a building’s negative environmental impacts.
The design community has enthusiastically embraced CLT for its ability to create beautiful, functional spaces, and to meet the rising demand for buildings that can be constructed and operated more sustainably.
Greater onsite efficiency is made possible by CLT. Half the number of workers is typically needed for CLT installation compared to concrete construction.
CLT is cost-competitive. Cost savings are driven by efficiency in materials production, simplified logistics, and reduced labor-hours during installation, making CLT particularly cost-competitive in markets with high labor rates.
Mass Timber is sourced primarily from sustainably managed forests in North America, particularly in the Pacific Northwest. These forests are known for high-quality wood, which is used in the manufacturing process of mass timber. The wood is typically harvested from young trees, which have a lower environmental impact. Sawmill residues are also used, minimizing waste.
The most commonly used wood species for mass timber construction in North America is Douglas fir, which is prevalent in the Pacific Northwest. Douglas fir is known for its strength, durability, and versatility, making it an ideal choice for mass timber construction. Other species of wood used in mass timber construction include spruce, pine, and hemlock. These tree species are also sustainably managed and known for their structural and aesthetic properties.
Mass timber construction dates to ancient civilizations. Modern applications, however, were developed in the late 20th century with the invention of cross-laminated timber (CLT). Advancements in technology and manufacturing processes have allowed for its versatile and efficient use in projects ranging from residential to commercial, and its popularity continues to grow globally.
Glue-laminated timber (GLT) is made by gluing together layers of dimensioned lumber, creating a structural member with increased strength and stiffness compared to the individual pieces of wood used.
Cross-laminated timber (CLT) has excellent load-bearing capabilities, with strength and stiffness properties comparable to or better than concrete and steel.
When exposed to fire, cross-laminated timber (CLT) forms a char layer on the surface that acts as insulation, protecting the uncharred wood underneath.
Several studies have been conducted on the seismic performance of CLT structures, including full-scale shake table tests and computer simulations. These studies have shown that CLT structures perform well under seismic loading and exhibit less damage and better recovery than traditional building materials such as concrete and steel.
A study conducted by the University of British Columbia in 2016 confirmed that CLT buildings have excellent sound insulation and absorption properties, providing a quiet and comfortable indoor environment.
Factory production ensures that the final product meets the required standards and specifications for building construction. MMT uses computer-controlled machines and specialized equipment to manufacture high-quality mass timber products with consistent dimensions and properties.
Prefabrication and modular construction allow components to be produced in a controlled factory setting before they are transported and assembled on site. This approach allows for greater accuracy, faster construction times, and cost savings.
Quality control and certifications are crucial for mass timber construction to ensure safety and structural integrity. Organizations such as the American Wood Council and the National Fire Protection Association provide guidelines and codes for design, fabrication, and construction. MMT’s products are also certified by organizations such as the Forest Stewardship Council and the Programme for the Endorsement of Forest Certification to ensure that the wood is sourced from sustainably managed forests.
Carbon sequestration refers to the process of capturing and storing carbon dioxide to reduce its concentration in the atmosphere. Trees and forests are natural carbon sinks, and mass timber construction allows for the continued sequestration of carbon throughout the life of the building. The carbon stored in the wood products used in mass timber construction remains stored for as long as the wood is not burned or allowed to decompose. Mass timber buildings not only have a lower carbon footprint than traditional buildings, but continue to actively remove carbon from the atmosphere.
Mass timber is a renewable resource. The wood used for mass timber construction is harvested from sustainably managed forests that are replenished over time. Additionally, mass timber is biodegradable and can be returned to the ecosystem at the end of its useful life, unlike concrete and steel.
Mass timber products are strong, stable, and resistant to decay and insect damage. Properly designed, constructed, and maintained, mass timber buildings have a service life of several decades or even centuries. This makes mass timber construction a cost-effective option, as it reduces the need for frequent repairs and replacements over time.
The following case studies highlight the natural beauty, efficiency, cost-effectiveness, and sustainable value of mass timber construction.
As the demand for sustainable, eco-friendly building solutions continues to grow, we expect mass timber to take center stage. New technologies and manufacturing processes will push the boundaries of what is possible. With the benefits of mass timber becoming clearer, the industry is looking for ways to build ever higher, and imagining solutions for constructing infrastructure and transportation projects out of laminated wood.
Learn more about MMT’s extensive mass timber capabilities, and how we can best support your next project as an integrated technical partner or material supplier.