Lou Farrell, senior editor of construction and manufacturing at Revolutionized Magazine, discusses how prefabricated materials address challenges in the building process
Carbon-intensive steel and concrete are only a few examples of materials that are controversial from practical, financial, and environmental perspectives. This is why prefabricated alternatives have entered the market, become competitive and scalable and helped companies achieve financial and carbon savings simultaneously.
Industry leaders have been embracing prefabricated construction materials for years because they address many of the pain points of conventional building methods.
Light-gauge steel framing
Construction is one of the most carbon-emitting industries, and steel is a large contributor. It requires invasive sourcing, and transporting it uses copious amounts of fuel and resources. Cold-formed, thinner steel is lighter than traditional beams and can be bent into various shapes. It requires significantly less energy, and studies show that its scalability can even help address the UK housing crisis. It would expedite modular builds by reinforcing wall panels and flooring.
Modular structures can also arrive on the jobsite with insulation and windows already installed. The preparation helps the workforce maintain tight turnarounds without causing additional disruption, waste and destruction to the local land. In 2018, the citizenM hotel chain built luxury lodging with modular steel and concrete flooring. It was a fast installation, especially since the rooms were shipped with most of the furnishings already in place, reducing transportation emissions.
Mass timber
Mass timber is an umbrella term for several varieties of engineered wood products. This includes laminated strand lumber and cross-laminated timber, among many others. Producers can take thinner layers of wood and stack them, making the resulting stack sturdy and suitable for structural components in prefabricated homes. It is versatile and can be used for beams, floor panels, walls and columns.
Like most prefabricated components, mass timber is highly compatible with manufacturing machinery, enabling off-site manufacturing for easy on-site assembly. Fast, precise production has allowed construction experts to reach new heights. In 2022, the Ascent MKE Building was named the tallest mass timber building in the world, towering over Milwaukee with 18 stories of cross-laminated timber hybrid components.
From a sustainability standpoint, it offers numerous advantages. Mass timber products have high fire resistance, encouraging char formation rather than rapid spread. Considering non-wood structures comprise 15% of global emissions, ethically sourced mass timber can replace many of these harmful buildings by boosting stability, durability and flexibility.
Precast concrete panels
Environmentally conscious concrete comes in many forms, from simple recycled aggregates to carbon-sequestering additives. However, prefabricated buildings can also use precast concrete panels manufactured in reusable moulds at manufacturing facilities. Because the pieces are produced in moulds, quality control is easier, reducing waste from defective panels. The material is useful for beams, floors, and walls, providing structures with unparalleled energy efficiency and thermal management.
Precast concrete offers many benefits during the manufacturing process and also resists the elements. This characteristic makes it ideal for construction professionals who need to meet deadlines. Workers can erect the fixtures with little regard for the weather during the project’s timeline.
While this appears to be just a quality-of-life enhancement, sticking to build schedules provides environmental benefits by reducing overall emissions from equipment that continues to pollute and generate waste throughout long builds.
Structural insulated panels (SIPs)
SIPs use oriented strand board panels surrounded by rigid foam insulation, which is strong enough to form the roof and walls. These are eco-friendly because they can be specifically designed for each project, minimising waste by preventing scraps and excess cuts from the panels.
Because of their sandwich design, SIPs are also airtight, preserving the structure’s internal conditions. Some SIP experts have achieved 50% reductions in build times with the material, along with up to 60% lower energy consumption.
3D-printed materials
Additive manufacturing is one of the most promising prospects for sustainable construction, because it can create lightweight alternatives for materials that are difficult and destructive to source. Printers can also create more complex parts in a single piece, reducing structural integrity issues throughout the building.
Large-scale 3D printers are changing the world of concrete by using formulations that produce a material structurally similar but easier to transport and less carbon-intensive to manufacture. It can cut working days by up to 80% and waste generation by 60%.
However, 3D printing extends far beyond concrete. Entire homes are being printed, permanently changing the prefabrication market. It has been helping regions enduring severe climate change stressors, such as Texas.
Many citizens are buying 3D-printed homes, and because the companies behind them are advancing technology so rapidly, it will also benefit commercial entities. They comply with building codes, can integrate with renewable energy and keep Texas households cool, even amid massive temperature spikes.
The intersection of prefabricated construction materials and efficient building
Prefabricated construction materials have become synonymous with productive, rapid-turnover building projects. Options like additive manufacturing and mass timber have proven that carbon-friendly materials are durable and resilient, even as climate change stressors threaten infrastructure.
They have accelerated construction during a period when residential and commercial accommodations are in short supply, making them the most sensible option for efficiency and sustainability.
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