Premium Construction Solutions

The wall assembly refers to the exact sequence of materials that make up a construction element—such as a wall, floor, or roof—arranged from the interior to the exterior. Each layer has a specific role: the steel structure carries the loads, thermal and acoustic insulation reduces heat and sound transfer, the vapor barrier controls moisture migration, and rigid boards (such as OSB or gypsum board) provide structural rigidity and finishing support. Understanding the wall assembly is essential for evaluating the real performance of a building and for making accurate comparisons between construction solutions available on the market.

The construction systems are divided into six variants: Economic, Economic Plus, Standard, Standard Plus, Premium, and Premium Plus, differentiated by the type of insulation materials used and the energy performance achieved.

The Economic system uses an external thermal insulation system made of 100 mm expanded polystyrene (EPS) and mineral wool in the cavity of the steel profile, representing a cost-efficient solution. The Economic Plus variant maintains the same configuration but replaces the polystyrene with basalt wool of the same thickness, improving fire behavior and acoustic performance.

The Standard system increases the thickness of the external insulation system to 150 mm using EPS, while basalt mineral wool is used within the wall cavity.

The Standard Plus variant replaces the EPS insulation with 150 mm basalt wool and uses injected cellulose within the profile cavity for improved insulation performance.

The Premium system is built entirely with 150 mm basalt wool on the exterior and replaces OSB boards with VidiWall boards, offering higher performance and superior durability.

The Premium Plus variant takes the system to a higher level by using a 200 mm basalt wool external insulation system, while milled basalt wool is used within the wall cavity, ensuring very high energy performance compatible with advanced energy efficiency standards.

The vapor barrier is a membrane that controls the migration of moisture from the warm and humid interior of the house toward the exterior. Without it, water vapor can condense inside the wall assembly, which over time can lead to moisture accumulation in the insulation (reducing its efficiency), mold formation, and the deterioration of OSB or gypsum boards. When correctly installed—typically on the interior side of the steel frame wall—the vapor barrier becomes one of the most important components of a properly built wall, but also one of the most frequently omitted or incorrectly installed elements in practice.

Interior walls built on steel structures do not require thermal insulation, but they do require acoustic insulation to limit the transmission of noise between rooms. Basalt wool is commonly used for sound reduction and is placed within the cavities of the C profiles. Additionally, special gypsum boards designed for acoustic insulation and double-layer cladding systems can be used to further improve sound performance.

A typical floor assembly in a steel structure building is composed, from bottom to top, of: gypsum board (ceiling), OSB board, a truss beam made of C profiles (the structural element, approximately 300 mm high), basalt mineral wool placed within the beam cavity for acoustic insulation, an OSB board above the floor structure, extruded polystyrene (XPS) for additional thermal insulation, a semi-dry screed, and optionally an underfloor heating system embedded in the screed. The underfloor heating system is compatible with this type of structure and is especially recommended for ground floors, where heat loss toward the ground is more significant.

Injected cellulose insulation is an insulating material made from recycled paper treated with fire-retardant and antifungal additives, blown under pressure into the cavities of the steel profiles. Compared to mineral wool (which is cut and installed manually), cellulose adapts perfectly to any geometry, eliminates gaps, and provides continuous insulation without thermal bridges inside the profile. It also offers excellent acoustic properties and a superior ecological profile.

Enclosure systems include all the technical details through which the building envelope—walls, roof, and floors—is completed and sealed: the way windows and doors are installed in the steel wall, how corners and wall intersections are executed, and how the junction between the wall and the floor or between the wall and the roof is handled. Each of these details is critical for the building’s thermal performance and airtightness—a single incorrectly executed construction joint can lead to air infiltration, thermal bridges, or condensation.

There are two main methods. The first method involves installing the window or door directly within the structural wall plane, in the opening defined by the steel profiles. In this case, the window frame area is treated in a way that reduces thermal bridges by using proper enclosure and insulation solutions. The exterior OSB returns onto the sill, creating a continuous base for installation, over which a layer of extruded polystyrene of approximately 5 cm is applied to break the thermal bridge. The window frame is fixed both mechanically and with polyurethane mounting foam, ensuring the stability and airtightness of the assembly. Sealing tapes are then applied around the perimeter, and the sills are brought to the level of the thermal insulation system by adding an additional layer of extruded polystyrene, usually about 2 cm, to ensure the continuity of the insulation layer and eliminate heat loss. The second method, recommended for thicker walls (C150) or walls with a substantial thermal insulation system, uses installation frames—intermediate elements fixed with polymer adhesive and mechanical anchors—which allow the windows to be installed at the optimal distance from the insulation, eliminating the thermal bridge at the sill.

Exterior corners and wall intersections are the most vulnerable areas of a building envelope: if they are not properly executed, they can become sources of thermal bridges, air infiltration, or condensation. In steel structures, these joints are resolved through the precise overlapping and anchoring of C profiles, ensuring the continuity of the vapor barrier and the enclosure boards. At exterior corners, additional thermal insulation is added to compensate for the higher heat loss compared to a standard wall. At intersections with interior walls, acoustic insulation continues without interruption to prevent sound transmission through the structure.

A ventilated façade is an external cladding system installed over the thermal insulation, creating a naturally ventilated air gap between the insulation layer and the exterior cladding. Air circulates through this cavity from bottom to top, helping remove accumulated moisture and protecting the structure from condensation-related issues.

This system is typically used instead of traditional plaster finishes when exterior materials such as wood cladding, ceramic panels, composite panels, or other façade systems are desired. While a ventilated façade is generally more expensive than a standard thermal insulation system, it offers clear advantages in terms of durability, moisture control, and architectural appearance.

Retropanel is an exterior cladding and roofing system made of profiled metal sheets with a shingle-like appearance, used as an alternative to traditional plaster finishes or other façade systems. In the enclosure system of a steel structure building, retropanel is installed on a supporting layer of boards fixed to vertical supports, beneath which a vapor-permeable and water-resistant membrane is applied. This solution is compatible with steel structure constructions and provides a distinctive aesthetic appearance, with a long service life and minimal maintenance.

The junction between the exterior wall and a flat roof with a parapet is one of the most critical construction details, as this is where the risk of water infiltration and thermal loss is concentrated. The correct solution involves continuing the waterproofing membrane from the terrace slab over the face of the parapet, finished with a protective metal coping. The thermal insulation system is also extended over the exterior face of the parapet, eliminating the thermal bridge. Tapered insulation installed on the terrace slab ensures proper drainage toward the collection outlets. Each layer—structural OSB, waterproofing, thermal insulation, and parapet coping—must be continuous and properly connected to guarantee long-term airtightness and protection.