TechDaal Factory

A lightweight steel structure is a construction system made from cold-formed galvanized steel profiles with reduced thickness (typically 1 / 1.5 / 2 / 2.5 mm), assembled using screws. Production takes place in a factory on automated roll-forming lines: the galvanized steel strip passes through a series of rollers that progressively shape it into the desired profile—such as C or Z—with precision down to fractions of a millimeter. The produced elements are either delivered as individual profiles or preassembled as panels or complete frames, ready for installation on site.

Lightweight steel structures are used for a wide range of constructions: houses, office buildings, commercial spaces, industrial halls, modular buildings, extensions and additional floors for existing constructions, attic conversions, structures for photovoltaic panels, or solar carports. The versatility of the system allows it to be adapted to almost any geometry or functional program, both in urban environments and in hard-to-access areas.

Compared to concrete, lightweight steel structures are 5–7 times lighter, can be assembled 3–5 times faster, and generate significantly less waste on site. Compared to timber, they offer superior dimensional stability (they do not expand, contract, or rot), better fire resistance, and predictable structural behavior that can be calculated using standardized engineering methods. In both cases, galvanized steel outperforms these materials in terms of lifespan and long-term maintenance costs.

The standard raw material is S350GD structural steel (zinc-magnesium steel with a coating grade of up to ZM200 g/m², or galvanized steel with a coating grade of up to Z400 g/m²). Steel is 100% recyclable at the end of the building’s life cycle.

Lightweight steel structures have favorable seismic behavior for several reasons: their lower weight reduces the inertial forces generated during an earthquake, the flexibility of steel allows the dissipation of seismic energy without sudden failure, and the uniform distribution of structural elements creates a redundant structural system. These characteristics make them particularly suitable for Romania, a country with significant seismic risk according to the P100 seismic design code.

The production time depends on the complexity of the project, but manufacturing in an industrialized production environment is significantly faster than traditional methods. Preassembly in the factory further reduces the time required on site. As a general reference, the raw structure of a 150 sqm steel frame house can be assembled within 3–5 working days after delivery, compared to several weeks for an equivalent concrete structure.

Preassembly (pre-installation) refers to the fabrication in the factory of structural subassemblies, such as wall segments, frames, or roof elements, which are later transported and installed on site. This approach allows the work to be carried out in a controlled environment, resulting in high precision of the connections and significantly reducing the risk of errors during assembly. At the same time, the time required for on-site construction is considerably reduced, and the organization of the works becomes more efficient from a logistical perspective. By using preassembled subassemblies, both the quality of execution and the overall project timeline are optimized, making it a recommended solution especially for constructions with complex geometry or for projects with strict completion deadlines.

Metal profiles have high thermal conductivity and can create thermal bridges, which is why the correct design of the building envelope is essential. In modern lightweight steel structure systems, thermal bridge reduction is not achieved through thermally broken profiles themselves, but through dedicated construction solutions such as thermal insulating strips, continuous insulation layers, and the correct arrangement of materials within the walls and roof. Through these measures, heat transfer through the metal elements is limited and high energy performance can be achieved, compatible with current requirements for energy-efficient buildings, including nZEB standards.

Lightweight steel structure buildings made from galvanized steel require minimal maintenance. The anti-corrosion protection provided by zinc or zinc-magnesium coatings is durable over time and does not require periodic renewal under normal operating conditions. Once integrated within the building envelope, the structural elements are protected from moisture and corrosive agents. The main maintenance operations concern, as with any construction, the finishing components and installations, not the structure itself.

A modern lightweight steel structure factory is equipped with automated roll-forming lines of the LGS (Light Gauge Steel) type, which integrate all the operations required to produce structural elements into a single process. These machines process galvanized steel coil in a continuous flow, simultaneously performing profiling, technological perforations, cut-outs, and embossing according to the technical design. The entire process is digitally controlled based on models generated in specialized software, which eliminates execution errors and ensures high precision and repeatability. The result consists of perfectly compliant structural elements that can be assembled quickly on site without additional adjustments. Production capacity is expressed in linear meters of profiles manufactured annually and can reach very high values in specialized factories such as TechDaal.

Working with a specialized lightweight steel structure manufacturer offers clear advantages compared to traditional construction carried out entirely on site. An industrial manufacturer delivers elements produced in controlled conditions, with verified dimensional precision and layout according to European standards—quality that cannot be replicated manually on a construction site. Integrated design and production eliminate discrepancies between design and execution, a common risk when these stages are handled by different entities. In addition, timelines are more predictable, material costs are optimized through reduced production waste, and the warranties offered cover both the material and the execution. For the client, this means less risk, less time lost, and a structure with documented performance.