When it comes to module assembly types, there is no one perfect choice of construction material. Each of the three most popular materials has its pros and cons. They all have best-case building projects and instances where each modular assembly type would not be appropriate. In this article, we’ll cover three types of modular assemblies, their benefits, and when not to choose certain options.
There are two main wood-frame modular projects: Type V and Type III.
Understanding the distinctions between these categories is crucial for ensuring compliance and optimizing the design for the intended occupancy and size.
Type V projects involve wood framing throughout the entire structure. These projects are typically utilized for multi-family residences, hotels, and other hospitality facilities up to four stories high, with a maximum height of 70 feet. A fully integrated sprinkler system is a mandatory design requirement for Type V wood-frame modular construction.
On the other hand, Type III projects allow for wood framing in all interior elements, while the exterior walls must be constructed using fire-retardant-treated wood. If these projects are fully sprinklered, they can be up to five stories for residential occupancies (six for offices) and up to 85 feet tall.
There are three wood framing methods worth noting in these projects:
Balloon framing is a method of constructing the building’s framework using long, straight studs that extend the entire height of the building, from the foundation to the roof. This method was popular through the mid-20th century.In a modular context, balloon framing refers to the studs extending from the top to the bottom of the module, rather than the studs starting on top of the floor system.
Platform framing, also known as “stick framing,” is a method of constructing buildings where each floor is framed separately. The process involves building the floor frame first, then erecting the walls on top of it, and finally constructing the next floor’s frame on top of the walls, continuing this pattern up to the roof. This is the most common form of wood framing today.
Advanced framing, optimum value engineering (OVE), is a construction method designed to optimize material use and improve energy efficiency in wood-framed buildings.. OVE framing spaces studs, rafters, and joists at 24 inches on center. It eliminates unnecessary framing members. This technique reduces waste and lowers material costs. Additionally, it allows for better insulation installation. As a result, OVE framing improves thermal performance of the structure.
One of the biggest benefits of wood is that it is often more affordable than steel. It’s also a sustainable material, which promotes eco-friendly construction. Wood is versatile, allowing for easy customization and modification accommodating various architectural designs.
A considerable disadvantage of wood is its limitations in terms of height and span compared to steel alternatives. It is also vulnerable to moisture and susceptible to rot and decay when exposed, requiring proper maintenance and protection. Finally, wood is combustible, posing a higher fire risk than steel.
Wood modules are popular for residential buildings, including single-family homes, multi-family housing, and low-rise apartment buildings. Wood’s sustainability makes it an excellent choice for environmentally conscious construction projects. Finally, wood module assembly can be the right choice for temporary structures, such as site offices and event pavilions.
Due to its height limitations and fire risks, wood module assembly is not the best choice for tall structures such as high-rise buildings. It’s also less suitable for buildings in areas prone to high moisture levels, such as coastal regions.
Light gauge steel buildings use cold-formed steel framing members made from thin-sheet steel. They contain galvanized steel studs, wall panels, joists, and trusses, which are lightweight, durable, and corrosion-resistant.
Light gauge steel offers superior strength and durability compared to wood, helping enhance a building’s structural integrity. Steel is also non-combustible, reducing the risk of fire and increasing building safety. Steel structures have a longer lifespan and require minimal maintenance, reducing a building’s lifecycle costs.
On the downside of light gauge steel assemblies, this type of construction typically involves higher upfront costs than wood. Steel may also require specialized labor and equipment, adding complexity to the installation process. Finally, steel conducts heat and cold, requiring additional insulation for thermal comfort in a building.
Light gauge steel is ideal for commercial structures such as offices, retail outlets, and industrial facilities. If you have a complex building with multiple interior partitions where you are framing the inside, you could frame the outside as well to save on costs. Steel modules are also suitable for mid-rise and high-rise buildings since they can support greater heights and spans. And steel’s durability makes it a preferred choice for projects where longevity is a priority, such as schools and healthcare facilities.
For budget-constrained projects, you may not find light gauge steel assembly a feasible choice due to its higher initial costs. Steel structures may require additional reinforcement and maintenance if you are building in a region prone to seismic activity or corrosive environments.
Red iron steel structures are popular in the commercial and industrial sectors because of their durability, flexibility, and affordability. A typical red iron building is rectangular with large open spans.
Red Iron kits, composed of structural steel, offer unmatched strength and load-bearing capacity as their main advantage. The structural steel also allows for flexible designs, easily accommodating complex architectural requirements. And, like light gauge steel, these structures require minimal maintenance over their lifespan, reducing long-term costs.
Like light gauge steel module assemblies, red iron kits involve significant upfront costs, including material procurement and labor expenses. The installation and assembly of structural steel components also require specialized skills and equipment. Since structural steel modules are heavier than wood or light gauge steel, they need proper handling and transportation logistics. Specialized logistics is crucial in this scenario to ensure the safe and efficient movement of the heavy steel components from the fabrication facility to the construction site, preventing damage and delays.
Red iron kits are commonly used to construct taller buildings which require more structural support. Nearly all of the tallest modular buildings in the world were constructed using red iron steel as the frames. Finally, steel structures offer superior seismic resistance, making them ideal for regions prone to earthquakes.
Thanks to the high initial investment and complexity, red iron kits may not be practical for small-scale projects with limited budgets. These module assembly types are also less commonly used in residential buildings due to cost considerations and design preferences.
The choice between modular wood construction, light gauge steel, and red iron kits depends on various factors, including project requirements, budget constraints, environmental considerations, and design preferences. Each material offers unique advantages and limitations, so choosing the right product for your project will boil down to your budget and your priorities. When considering the type of module assembly to build, it is also important to factor in your logistics partner, as different materials and assembly types may require specialized handling, transportation, and expertise from the logistics provider. Evaluating the capabilities of potential logistics partners should be part of the decision-making process for the module assembly type. For guidance on assessing the advantages and limitations of each module assembly type or logistics, consult , consult with professionals to get your project started on the path to success.
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Stream Modular is a transportation logistics company specializing exclusively in modular construction. We help modular manufacturers and builders transport mods, pods, and panels so they arrive on time and safely to the build site.
