Steel construction profiles – a modern alternative to glued laminated timber | Cold-formed profiles

Cold-formed profiles – key information to consider before making a choice

In our new series, “Cold-Formed Profiles,” we’ll present practical information about this technology. We’ll discuss the key advantages of these profiles, their limitations, and tips on how to avoid common installation mistakes. We’ll also show how cold-formed profiles affect project timelines, construction costs, and a building’s energy efficiency. With this knowledge, every investor and contractor will be able to make an informed decision about whether this solution is right for their project.

In this article , we compare various types of structural beams—both steel and wood—taking into account their strength, technical specifications, and applications in construction and industry. While structural timber is ideal where aesthetics and a natural appearance are important, steel structural beams offer exceptional strength and resistance to weather conditions.

Z, C, Σ, and U Steel Profiles – Production Capabilities

Cold-formed steel profiles are a modern material that makes it possible to carry out projects on an impressive scale. The Blachy Pruszyński Company offers sections up to 12 meters long (longer lengths can also be manufactured upon request), which opens up a wide range of design possibilities for the construction of industrial halls, warehouses, sports facilities, and terrace and pergola structures. When selecting steel profiles, it is essential to prepare a detailed structural design that specifies the technical and strength requirements for a given project.

Steel profiles are available in various heights—from 100 mm to 400 mm (for Z, C, and U profiles) and from 140 mm to 350 mm (for Σ profiles). Designations such as Z150, C200, or Σ300 indicate the profile height in millimeters, which allows for precise adaptation of the components to the specific requirements of the project, as well as the load-bearing capacity and span of the structure.

Compared to alternative solutions—such as structural lumber, BSH glued laminated timber, laminated timber, or KVH timber—steel beams stand out for the following characteristics:

• greater resistance to deformation and deflection;
• no need for maintenance or waterproofing;
• dimensional stability regardless of humidity conditions;
• the ability to precisely select profiles to meet structural requirements;
• Certified production in accordance with European standards.

BSH Glued Laminated Timber vs. Steel Profiles – A Comparison of Materials

BSH Lumber – Characteristics and Applications

BSH glued laminated timber is a material produced from lamellas approximately 40 mm thick, which are planed on all four sides and have chamfered edges (cut at an angle). This finish not only improves the aesthetics but also the functionality of the structural elements. The most important characteristics of BSH glued laminated timber are its dimensional stability and its natural, attractive appearance.

BSH lumber is distinguished by its superior strength properties compared to traditional structural lumber.

BSH structural lumber is mainly used in:

• roof structures of residential buildings;
• construction of pergolas and gazebos;
• terraces and garden architecture elements;
• in spaces where the aesthetic appeal of wood is an integral part of the design.

BSH lumber is used to manufacture girders and joists, as well as for decking.

However, laminated wood requires regular maintenance and treatment, and is susceptible to weather conditions. Popular species include larch and pine, which, when properly treated, can last for many years.

BSH glued laminated timber does not require additional treatment if it is kiln-dried.

BSH wood is an eco-friendly material that aligns with the principles of sustainable development, and it is available in various quality grades, which highlights its wide range of applications and influences the aesthetic appeal of the finish.

Maintenance and Protection – Explanation

Whether waterproofing is required depends on the assembly location:

1. Inside buildings: Thanks to chamber drying (to a moisture content of approx. 12–15%), BSH wood is biologically clean and does not require additional chemical treatment against insects or fungi.
2. Outdoors: If structures are exposed to rain and sunlight (pergolas, decks), they require regular maintenance. Use wood preservatives or oils to protect the wood from graying (UV rays) and moisture.

Construction Profiles – Technical Specifications

The structural steel beams offered by the Blachy Pruszyński Company are certified products made of S350GD steel (or S390GD upon prior agreement) with a zinc-magnesium coating (ZM-120), which ensures long-lasting corrosion resistance.

Available construction profiles:

Z-profile – high bending stiffness

Z-shaped with two symmetrical arms. Used in wall, roof, and ceiling structures. Available sizes: Z100, Z150, Z180, Z200, Z250, Z300, Z350, Z400.

C and C+ Profiles – Versatile Applications

The C profile is characterized by good bending stiffness. The C+ version, with additional “wings,” increases load-bearing capacity while maintaining a lower weight. Sheet thickness: 1.5–3.5 mm (C) and 1.5–2.5 mm (C+).

Σ (Sigma) and Σ+ profiles – maximum strength

Its “S”-shaped design provides high bending stiffness and resistance to deflection. Ideal for floor beams and roof structures. Dimensions: from Σ140 to Σ350.

U-Profile – a cost-effective solution

The simple design allows for the use of thicker sheet metal (up to 3.5 mm). Lower weight and a competitive price while maintaining the required load-bearing capacity.

Advantages of Steel Profiles Compared to Wood

Strength and Load-Bearing Capacity

The greatest advantage of steel beams is their strength and ability to bear heavy loads. Thanks to joining technologies and precision manufacturing, components of various dimensions can be produced, precisely tailored to the needs of the structure.

Weather resistance

Unlike wood, which requires regular maintenance, steel profiles with a zinc-magnesium coating retain their properties for decades without the need for additional protection. Their resistance to moisture, UV radiation, and temperature fluctuations makes them an ideal material for outdoor applications.

Dimensional stability

Steel does not swell, shrink, or deform in response to changes in humidity. This dimensional stability is crucial in precision structures and large-scale projects.

Prefabrication and Speed of Assembly

The profiles are prefabricated components, which shortens construction time and ensures greater precision. The ability to create perforations during the manufacturing stage (holes Ø10–22 mm, notches 14×18 mm to 19×25 mm) further speeds up assembly.

Fire Safety

Steel is a non-combustible material, which is a huge advantage in industrial construction. Steel profiles do not spread fire, which directly translates to a higher level of safety for the facility. This is crucial for fire safety inspections and often allows for more favorable insurance terms for large-scale buildings, such as warehouses or manufacturing facilities.

Where are construction profiles used?

Long structural members are the foundation of modern construction; without them, it would be difficult to imagine today’s industrial buildings or warehouses. Their purpose is to support the weight of the roof, ensure the stability of the entire building, and allow for the creation of vast, open spaces without the need for dense rows of columns.

Using cold-formed steel sections, engineers can design structures with spans of up to 40 meters. However, they do not do this using a single, heavy beam. Instead, they use clever systems to join lighter profiles up to 12 meters long. Thanks to the use of special overlaps and gussets (i.e., reinforcements where the sections meet), strong structural spans are created. This technology makes it possible to build structures that are lightweight, cost-effective, and highly durable, while utilizing high-strength steel, which, despite its thin gauge, is exceptionally robust.

Steel profiles can be used in structures that are then clad with sandwich panels, which affects their weight and strength.

When it comes to exterior structures, steel profiles work well both outside and inside buildings.

Steel profiles can also be used in residential construction, especially in modern prefabricated building methods.

Examples of use:

• industrial buildings and warehouses – wall studs, purlins, load-bearing structures;
• sports facilities – roof structures for stadiums and sports arenas;
• logistics centers – racking structures, load-bearing systems;
• public buildings – roof and floor structures;
• industrial infrastructure – machine and equipment supports;
• Outdoor structures—pergolas, shelters, and patio roofs.

In this type of construction, steel beams are used when strength, long spans, and maximum durability are essential. Structural timber—especially BSH timber—is ideal, however, in situations where aesthetics and a natural appearance are just as important as functionality.

Steel Profile Manufacturing Technology

Cold-forming process

Steel profiles are produced through a cold-forming process, in which steel strip is shaped on rollers without heating the material. Although the name may sound unusual, this technology is a true masterpiece of precision that ensures:

• precise dimensions: the tolerance is only ±1 mm, which means the parts fit together like building blocks;
• greater strength: interestingly, when cold-bent, steel actually becomes even harder in some places (this is known as the “crushing” phenomenon);
• consistent quality: every centimeter of the profile has exactly the same specifications along its entire length;
• Complex shapes: the ability to create Z-, C-, or Sigma-type profiles that are lightweight yet as rigid as solid beams.
• environmental friendliness and cost savings: the process does not require large amounts of energy to heat the furnaces, and the profiles are protected by a zinc-magnesium coating as early as the production line stage.

Certified Production

The Blachy Pruszyński Company uses certified materials from reputable European steel manufacturers. Each production batch is inspected to ensure compliance with standards and technical specifications.

When should you choose wood, and when should you choose steel?

Choose BSH glued laminated timber when:

• The aesthetic appeal of natural wood is an integral part of the architectural design;
• you build residential structures, pergolas, and gazebos;
• the structure will be visible and serve as a decorative element;
• you prefer natural, renewable materials;
• You have the option of performing regular maintenance on the components.

Choose steel profiles when:

• you need maximum strength and load-bearing capacity;
• You build industrial facilities, warehouses, and commercial buildings;
• you want long-lasting, maintenance-free durability;
• Precise dimensional stability is required;
• the structure will be exposed to harsh weather conditions;
• You need quick assembly and prefabrication.

Production Capabilities of Blachy Pruszyński Company

Z, C, Σ, and U profiles (and extended versions C+ and Σ+)

• material: S350GD steel; S390GD available upon request
• coating: ZM-120 zinc-magnesium coating
• sheet thickness: 1.5–3.5 mm
• length: up to 12 meters
• profile height: 100–400 mm

Assembly and Compatibility

Steel profiles are characterized by:

• ease of assembly—thanks to perforations and standardization;
• compatibility with accessories – universal mounting systems;
• a perfectly flat grill surface – precision craftsmanship;
• the ability to assemble—assembling components on-site.

Comparison Table

The table below will help you quickly compare the two materials and choose the solution that best suits the nature of your project.

Summary – Steel Profiles as the Material of the Future

Z, C, Σ, and U construction profiles offer a modern alternative to traditional solutions made of BSH glued laminated timber. Thanks to cold-forming technologies, certified production, and the use of high-quality materials, these steel beams offer:

• high strength and stiffness with optimal weight;
• long-term resistance to weather conditions;
• dimensional stability regardless of humidity;
• suitable for use in structures with large spans;
• quick assembly thanks to prefabrication;
• No maintenance required.

As a certified manufacturer, the Blachy Pruszyński Company ensures the highest quality of steel profiles, guaranteeing durability, safety, and construction efficiency. The wide range of available profiles, dimensions, and customization options (perforation) makes it possible to carry out even the most demanding structural projects.