Steel Frame: what it is, how it works, and its advantages
Steel Frame: what it is, how it works, and its advantages
Steel frame is an industrialized construction system that uses cold-formed galvanized steel profiles as the building's structure, instead of bricks and concrete. It is a dry construction method, assembled with prefabricated panels enclosed by OSB boards, cement boards, and drywall, offering faster project delivery and less waste compared to traditional masonry.
Moisés Schwan Bach
Operations Manager · First Brazil
Operations Manager
Civil construction is experiencing a clear movement toward industrialization: less improvisation on site, more precision-manufactured parts, and predictable deadlines. Within this scenario, light steel framing has ceased to be a curiosity of high-end builds and has become a concrete alternative to traditional masonry, with its own technical standard since 2022.
Even so, it still raises doubts. Is it durable? Does it cost more? How many floors can it support? Can it be financed by Caixa? These are questions that always come up when someone considers swapping brick for steel.
This guide explains what steel framing is, how the system works, what components it uses, its advantages and limitations, a direct comparison with masonry, and the standards that regulate the technology in Brazil.
Civil construction is experiencing a clear movement toward industrialization: less improvisation on site, more precision-manufactured parts, and predictable deadlines. Within this scenario, light steel framing has ceased to be a curiosity of high-end builds and has become a concrete alternative to traditional masonry, with its own technical standard since 2022.
Even so, it still raises doubts. Is it durable? Does it cost more? How many floors can it support? Can it be financed by Caixa? These are questions that always come up when someone considers swapping brick for steel.
This guide explains what steel framing is, how the system works, what components it uses, its advantages and limitations, a direct comparison with masonry, and the standards that regulate the technology in Brazil.
Civil construction is experiencing a clear movement toward industrialization: less improvisation on site, more precision-manufactured parts, and predictable deadlines. Within this scenario, light steel framing has ceased to be a curiosity of high-end builds and has become a concrete alternative to traditional masonry, with its own technical standard since 2022.
Even so, it still raises doubts. Is it durable? Does it cost more? How many floors can it support? Can it be financed by Caixa? These are questions that always come up when someone considers swapping brick for steel.
This guide explains what steel framing is, how the system works, what components it uses, its advantages and limitations, a direct comparison with masonry, and the standards that regulate the technology in Brazil.
What is steel frame and how does the system work?
Steel frame is an industrialized construction system in which cold-formed galvanized steel profiles function as the building's skeleton, replacing brick walls and concrete structures. Also called Light Steel Framing (LSF) or dry construction, the system eliminates the use of water in most of the construction, relying on it almost exclusively in the foundation.
Its operation starts with a grid of steel profiles (vertical studs, tracks, and beams) that form structural panels. These panels are assembled over a foundation, usually a concrete slab, and then closed with boards on both sides. The structure distributes the building's vertical and horizontal loads in a manner similar to a rigid cage.
Because they are prefabricated and sized during the design phase, the pieces arrive at the construction site ready for assembly, which reduces cutting, improvisation, and execution errors. The lightness of the steel also allows for simpler foundations and facilitates transport.
The technique was born in the United States after World War II, when steel became an abundant material, and evolved from wood framing (timber structure). In Brazil, it arrived in the 1990s, with the first registered house built in 1998.
What is steel frame and how does the system work?
Steel frame is an industrialized construction system in which cold-formed galvanized steel profiles function as the building's skeleton, replacing brick walls and concrete structures. Also called Light Steel Framing (LSF) or dry construction, the system eliminates the use of water in most of the construction, relying on it almost exclusively in the foundation.
Its operation starts with a grid of steel profiles (vertical studs, tracks, and beams) that form structural panels. These panels are assembled over a foundation, usually a concrete slab, and then closed with boards on both sides. The structure distributes the building's vertical and horizontal loads in a manner similar to a rigid cage.
Because they are prefabricated and sized during the design phase, the pieces arrive at the construction site ready for assembly, which reduces cutting, improvisation, and execution errors. The lightness of the steel also allows for simpler foundations and facilitates transport.
The technique was born in the United States after World War II, when steel became an abundant material, and evolved from wood framing (timber structure). In Brazil, it arrived in the 1990s, with the first registered house built in 1998.
What is steel frame and how does the system work?
Steel frame is an industrialized construction system in which cold-formed galvanized steel profiles function as the building's skeleton, replacing brick walls and concrete structures. Also called Light Steel Framing (LSF) or dry construction, the system eliminates the use of water in most of the construction, relying on it almost exclusively in the foundation.
Its operation starts with a grid of steel profiles (vertical studs, tracks, and beams) that form structural panels. These panels are assembled over a foundation, usually a concrete slab, and then closed with boards on both sides. The structure distributes the building's vertical and horizontal loads in a manner similar to a rigid cage.
Because they are prefabricated and sized during the design phase, the pieces arrive at the construction site ready for assembly, which reduces cutting, improvisation, and execution errors. The lightness of the steel also allows for simpler foundations and facilitates transport.
The technique was born in the United States after World War II, when steel became an abundant material, and evolved from wood framing (timber structure). In Brazil, it arrived in the 1990s, with the first registered house built in 1998.
What are the components of a steel frame construction?
A steel frame construction combines the steel structure with layers of cladding, insulation, and finishing, each with a specific function. The set works integrated to ensure strength, thermal and acoustic comfort, and watertightness.
The main components are:
Component | Function in the construction |
|---|---|
Galvanized steel profiles (cold-formed) | Main structure: studs, tracks, beams, and roof |
Concrete slab (radier) | Foundation that receives and anchors the structure |
OSB boards (Oriented Strand Board) | Structural reinforcement and external sheathing base |
Cement boards | Weather-resistant external cladding |
Drywall (gypsum board) | Internal sheathing and smooth finish |
Glass wool, rock wool, or PET | Thermal and acoustic insulation between profiles |
Protective membrane and vapor barrier | Moisture control in the external cladding |
According to the ABNT NBR 15253 standard, the steel profiles used in structural panels must have a minimum yield strength of 230 MPa, a thickness between 0.80 mm and 3.0 mm, and a hot-dip coating of Z275 zinc (275 g/m²) or AZ150 aluminum-zinc (150 g/m²). In environments close to the sea, a more reinforced galvanization (Z350) is recommended to protect the steel against corrosion.
What are the components of a steel frame construction?
A steel frame construction combines the steel structure with layers of cladding, insulation, and finishing, each with a specific function. The set works integrated to ensure strength, thermal and acoustic comfort, and watertightness.
The main components are:
Component | Function in the construction |
|---|---|
Galvanized steel profiles (cold-formed) | Main structure: studs, tracks, beams, and roof |
Concrete slab (radier) | Foundation that receives and anchors the structure |
OSB boards (Oriented Strand Board) | Structural reinforcement and external sheathing base |
Cement boards | Weather-resistant external cladding |
Drywall (gypsum board) | Internal sheathing and smooth finish |
Glass wool, rock wool, or PET | Thermal and acoustic insulation between profiles |
Protective membrane and vapor barrier | Moisture control in the external cladding |
According to the ABNT NBR 15253 standard, the steel profiles used in structural panels must have a minimum yield strength of 230 MPa, a thickness between 0.80 mm and 3.0 mm, and a hot-dip coating of Z275 zinc (275 g/m²) or AZ150 aluminum-zinc (150 g/m²). In environments close to the sea, a more reinforced galvanization (Z350) is recommended to protect the steel against corrosion.
What are the components of a steel frame construction?
A steel frame construction combines the steel structure with layers of cladding, insulation, and finishing, each with a specific function. The set works integrated to ensure strength, thermal and acoustic comfort, and watertightness.
The main components are:
Component | Function in the construction |
|---|---|
Galvanized steel profiles (cold-formed) | Main structure: studs, tracks, beams, and roof |
Concrete slab (radier) | Foundation that receives and anchors the structure |
OSB boards (Oriented Strand Board) | Structural reinforcement and external sheathing base |
Cement boards | Weather-resistant external cladding |
Drywall (gypsum board) | Internal sheathing and smooth finish |
Glass wool, rock wool, or PET | Thermal and acoustic insulation between profiles |
Protective membrane and vapor barrier | Moisture control in the external cladding |
According to the ABNT NBR 15253 standard, the steel profiles used in structural panels must have a minimum yield strength of 230 MPa, a thickness between 0.80 mm and 3.0 mm, and a hot-dip coating of Z275 zinc (275 g/m²) or AZ150 aluminum-zinc (150 g/m²). In environments close to the sea, a more reinforced galvanization (Z350) is recommended to protect the steel against corrosion.
What are the advantages and disadvantages of steel framing?
The main advantage of steel framing is the combination of speed, precision, and lower waste, which is a direct result of the industrialization of the parts. The main limitation is the height restriction and the need for specialized labor.
Advantages:
Speed: by using prefabricated components, construction can be several times faster than masonry.
Less waste: the material waste rate is around 3% to 5%, compared to 25% to 30% in masonry, according to market data and technical studies.
Precision and predictability: parts dimensioned in the project design reduce errors and budget surprises.
Dry construction: uses little water, generates less debris, and is less dependent on the weather.
Thermal and acoustic comfort: insulation between profiles improves the building's performance.
Easier maintenance: electrical and plumbing installations run inside the panels without breaking walls.
Disadvantages:
Story limit: the system is recommended for buildings up to five stories; according to NBR 16970, direct compliance applies to up to two stories.
Specialized labor: requires trained professionals from design to assembly.
Advance payment: because construction is fast, disbursement is concentrated at the beginning, unlike masonry, which dilutes costs over time.
Cost for small projects: in small-scale projects, industrialization has less room to dilute costs and can be more expensive.
What are the advantages and disadvantages of steel framing?
The main advantage of steel framing is the combination of speed, precision, and lower waste, which is a direct result of the industrialization of the parts. The main limitation is the height restriction and the need for specialized labor.
Advantages:
Speed: by using prefabricated components, construction can be several times faster than masonry.
Less waste: the material waste rate is around 3% to 5%, compared to 25% to 30% in masonry, according to market data and technical studies.
Precision and predictability: parts dimensioned in the project design reduce errors and budget surprises.
Dry construction: uses little water, generates less debris, and is less dependent on the weather.
Thermal and acoustic comfort: insulation between profiles improves the building's performance.
Easier maintenance: electrical and plumbing installations run inside the panels without breaking walls.
Disadvantages:
Story limit: the system is recommended for buildings up to five stories; according to NBR 16970, direct compliance applies to up to two stories.
Specialized labor: requires trained professionals from design to assembly.
Advance payment: because construction is fast, disbursement is concentrated at the beginning, unlike masonry, which dilutes costs over time.
Cost for small projects: in small-scale projects, industrialization has less room to dilute costs and can be more expensive.
What are the advantages and disadvantages of steel framing?
The main advantage of steel framing is the combination of speed, precision, and lower waste, which is a direct result of the industrialization of the parts. The main limitation is the height restriction and the need for specialized labor.
Advantages:
Speed: by using prefabricated components, construction can be several times faster than masonry.
Less waste: the material waste rate is around 3% to 5%, compared to 25% to 30% in masonry, according to market data and technical studies.
Precision and predictability: parts dimensioned in the project design reduce errors and budget surprises.
Dry construction: uses little water, generates less debris, and is less dependent on the weather.
Thermal and acoustic comfort: insulation between profiles improves the building's performance.
Easier maintenance: electrical and plumbing installations run inside the panels without breaking walls.
Disadvantages:
Story limit: the system is recommended for buildings up to five stories; according to NBR 16970, direct compliance applies to up to two stories.
Specialized labor: requires trained professionals from design to assembly.
Advance payment: because construction is fast, disbursement is concentrated at the beginning, unlike masonry, which dilutes costs over time.
Cost for small projects: in small-scale projects, industrialization has less room to dilute costs and can be more expensive.
Steel frame or masonry: what is the difference and the cost?
The core or central difference between steel frame and masonry lies in the method: the steel frame is industrialized and dry, assembled with prefabricated parts, while masonry is artisanal and wet, built brick by brick with mortar. This impacts the schedule, waste, and the cost profile of the construction.
Criterion | Steel frame | Conventional masonry |
|---|---|---|
Structure | Galvanized steel profiles | Bricks and concrete |
Water on site | Almost exclusively in the foundation (dry) | Intense use (mortar, plaster) |
Schedule | Reduced | Longer |
Material waste | ~3% to 5% | ~25% to 30% |
Weather influence | Low | High (drying) |
Payment | Concentrated at the beginning | Spread out over the course of the project |
Regarding the schedule, a study by Melo et al. (2022), comparing both systems in a building of about 350 m², indicated a reduction of 46 days with LSF, equivalent to 43.9% of the conventional system's time.
Regarding cost, there is no single answer. A study published in the CREA-PR technical journal, analyzing a small-sized residence in Araucária, found the steel frame to be about 30% more expensive in the final cost, although with a 17% shorter timeline. The economic advantage of steel tends to become more apparent in medium and high-end projects, where industrialization better leverages its benefits. As a market reference, 2023 estimates cited by Wikipedia pointed to a value around R$ 2,000 per m², varying according to region and finishes.
Steel frame or masonry: what is the difference and the cost?
The core or central difference between steel frame and masonry lies in the method: the steel frame is industrialized and dry, assembled with prefabricated parts, while masonry is artisanal and wet, built brick by brick with mortar. This impacts the schedule, waste, and the cost profile of the construction.
Criterion | Steel frame | Conventional masonry |
|---|---|---|
Structure | Galvanized steel profiles | Bricks and concrete |
Water on site | Almost exclusively in the foundation (dry) | Intense use (mortar, plaster) |
Schedule | Reduced | Longer |
Material waste | ~3% to 5% | ~25% to 30% |
Weather influence | Low | High (drying) |
Payment | Concentrated at the beginning | Spread out over the course of the project |
Regarding the schedule, a study by Melo et al. (2022), comparing both systems in a building of about 350 m², indicated a reduction of 46 days with LSF, equivalent to 43.9% of the conventional system's time.
Regarding cost, there is no single answer. A study published in the CREA-PR technical journal, analyzing a small-sized residence in Araucária, found the steel frame to be about 30% more expensive in the final cost, although with a 17% shorter timeline. The economic advantage of steel tends to become more apparent in medium and high-end projects, where industrialization better leverages its benefits. As a market reference, 2023 estimates cited by Wikipedia pointed to a value around R$ 2,000 per m², varying according to region and finishes.
Steel frame or masonry: what is the difference and the cost?
The core or central difference between steel frame and masonry lies in the method: the steel frame is industrialized and dry, assembled with prefabricated parts, while masonry is artisanal and wet, built brick by brick with mortar. This impacts the schedule, waste, and the cost profile of the construction.
Criterion | Steel frame | Conventional masonry |
|---|---|---|
Structure | Galvanized steel profiles | Bricks and concrete |
Water on site | Almost exclusively in the foundation (dry) | Intense use (mortar, plaster) |
Schedule | Reduced | Longer |
Material waste | ~3% to 5% | ~25% to 30% |
Weather influence | Low | High (drying) |
Payment | Concentrated at the beginning | Spread out over the course of the project |
Regarding the schedule, a study by Melo et al. (2022), comparing both systems in a building of about 350 m², indicated a reduction of 46 days with LSF, equivalent to 43.9% of the conventional system's time.
Regarding cost, there is no single answer. A study published in the CREA-PR technical journal, analyzing a small-sized residence in Araucária, found the steel frame to be about 30% more expensive in the final cost, although with a 17% shorter timeline. The economic advantage of steel tends to become more apparent in medium and high-end projects, where industrialization better leverages its benefits. As a market reference, 2023 estimates cited by Wikipedia pointed to a value around R$ 2,000 per m², varying according to region and finishes.
Which standards regulate steel framing in Brazil?
In Brazil, steel framing is mainly regulated by ABNT NBR 16970:2022, the first Brazilian standard created exclusively for Light Steel Framing, published on May 25, 2022. Prior to this, the system was evaluated as an innovative technology, via SINAT Guideline 003 and DATecs from the IPT.
NBR 16970 is divided into three parts:
Part 1 (Performance): requirements for structural safety, fire protection, watertightness, thermal and acoustic comfort, and durability for residential and non-residential buildings up to two stories.
Part 2 (Structural design): design criteria for the steel structure, connections, foundation anchoring, and deflection limits for the panels.
Part 3 (Interface between systems): constructive details between walls, floors, installations, and frameworks.
The standard is supported by a technical ecosystem, which includes NBR 15253 (profiles), NBR 14762 (calculation), NBR 6355 (geometry), NBR 8800 (steel structures), NBR 15575 (performance standard, from 2013), and NBRs 6120 (loads) and 6123 (wind).
The normative advancement had a practical effect on financing. With the publication of NBR 16970, Caixa Econômica Federal began treating steel framing as a conventional system, eliminating the requirement for DATec and allowing financing terms of up to 30 years. Projects with more than two stories remain feasible, but require specific structural analysis in compliance with NBR 14762 and NBR 8800.
Which standards regulate steel framing in Brazil?
In Brazil, steel framing is mainly regulated by ABNT NBR 16970:2022, the first Brazilian standard created exclusively for Light Steel Framing, published on May 25, 2022. Prior to this, the system was evaluated as an innovative technology, via SINAT Guideline 003 and DATecs from the IPT.
NBR 16970 is divided into three parts:
Part 1 (Performance): requirements for structural safety, fire protection, watertightness, thermal and acoustic comfort, and durability for residential and non-residential buildings up to two stories.
Part 2 (Structural design): design criteria for the steel structure, connections, foundation anchoring, and deflection limits for the panels.
Part 3 (Interface between systems): constructive details between walls, floors, installations, and frameworks.
The standard is supported by a technical ecosystem, which includes NBR 15253 (profiles), NBR 14762 (calculation), NBR 6355 (geometry), NBR 8800 (steel structures), NBR 15575 (performance standard, from 2013), and NBRs 6120 (loads) and 6123 (wind).
The normative advancement had a practical effect on financing. With the publication of NBR 16970, Caixa Econômica Federal began treating steel framing as a conventional system, eliminating the requirement for DATec and allowing financing terms of up to 30 years. Projects with more than two stories remain feasible, but require specific structural analysis in compliance with NBR 14762 and NBR 8800.
Which standards regulate steel framing in Brazil?
In Brazil, steel framing is mainly regulated by ABNT NBR 16970:2022, the first Brazilian standard created exclusively for Light Steel Framing, published on May 25, 2022. Prior to this, the system was evaluated as an innovative technology, via SINAT Guideline 003 and DATecs from the IPT.
NBR 16970 is divided into three parts:
Part 1 (Performance): requirements for structural safety, fire protection, watertightness, thermal and acoustic comfort, and durability for residential and non-residential buildings up to two stories.
Part 2 (Structural design): design criteria for the steel structure, connections, foundation anchoring, and deflection limits for the panels.
Part 3 (Interface between systems): constructive details between walls, floors, installations, and frameworks.
The standard is supported by a technical ecosystem, which includes NBR 15253 (profiles), NBR 14762 (calculation), NBR 6355 (geometry), NBR 8800 (steel structures), NBR 15575 (performance standard, from 2013), and NBRs 6120 (loads) and 6123 (wind).
The normative advancement had a practical effect on financing. With the publication of NBR 16970, Caixa Econômica Federal began treating steel framing as a conventional system, eliminating the requirement for DATec and allowing financing terms of up to 30 years. Projects with more than two stories remain feasible, but require specific structural analysis in compliance with NBR 14762 and NBR 8800.
Frequently asked questions
How many floors can a steel frame building have?
The steel frame is recommended for buildings up to five stories because it is a lightweight structure. According to the ABNT NBR 16970:2022 standard, direct framing is valid for up to two stories. Taller projects remain viable but require specific structural analysis in compliance with standards NBR 14762 and NBR 8800.
Is steel frame more expensive than brickwork?
It depends on the scale of the project. In small residences, steel framing can be about 30% more expensive in the final cost, according to a study by the CREA-PR magazine. The economic advantage appears in medium and high-end projects, where the shorter deadline and low waste better offset the investment.
Is a steel frame house strong and durable?
Yes. The structure uses galvanized steel profiles, which resist corrosion when properly coated, and complies with technical safety standards. NBR 15253 requires a minimum strength of 230 MPa and Z275 galvanization, reinforced to Z350 in coastal regions. The system also offers good thermal and acoustic performance.
Is it possible to finance a steel frame house through Caixa?
Yes. Following the publication of NBR 16970:2022, Caixa Econômica Federal began treating steel framing as a conventional construction system, eliminating the DATec requirement and allowing financing with terms of up to 30 years. Other banks also finance projects built with this system.
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