FAQ
Light gauge steel: your questions, answered.
Straight answers on light gauge steel construction in California, from fire and seismic performance to speed, cost drivers, ADUs, hotels, and mid-rise multifamily.
Light gauge steel basics
Read more- What is light gauge steel framing?
- Light gauge steel (LGS), also called cold-formed steel (CFS), is structural framing made from thin sheets of galvanized steel roll-formed into studs, tracks, and joists. It replaces dimensional lumber as the structural skeleton of a building and is well suited to panelized and modular prefabrication.
- Why is light gauge steel used in Southern California?
- It is non-combustible for wildfire resilience, performs well under seismic loads, resists pests and rot, and prefabricates for speed, all of which matter in California's fire-prone, earthquake-prone, fast-moving housing market.
- Is light gauge steel good for ADUs and fire rebuilds?
- Yes. Its non-combustible, panelized nature makes it an excellent fit for both backyard and multifamily ADUs and for rebuilding homes lost to wildfire with a hardened, code-compliant structure.
- How much faster is light gauge steel than wood?
- On the TESH Group Harvard Yard project, an identical building phase in light gauge steel topped out in 85 days versus 156 days in wood, with a field crew of 25 instead of 85.
- Is cold-formed steel the same as light gauge steel?
- Yes. Light gauge steel (LGS) and cold-formed steel (CFS) are the same material, and the framing is commonly called steel framing, cold-formed steel framing, or light gauge steel framing. CFS is the formal engineering term used in the AISI standards; LGS is the more common construction term. Whichever name you use, it refers to the same thin-gauge, roll-formed galvanized steel structural framing.
- Is TESH a licensed contractor in California?
- Yes. The contracting entity, TESH Incorporated, is a licensed California contractor (CSLB License # 310779, California State License Board). TESH Group designs, fabricates, and builds in light gauge steel across Southern California through its licensed operating companies.
- What standards is light gauge steel framing built to?
- Our cold-formed steel framing is engineered and fabricated to the AISI S240 and S100 standards for cold-formed steel structural framing, uses ICC-ES listed components, and is built to the California Building Code, including the Chapter 7A wildfire-hardening requirements where they apply.
Light gauge steel vs. wood framing
Read more- Is light gauge steel stronger than wood?
- Steel has a far higher strength-to-weight ratio than wood and does not weaken with moisture, pests, or age, so light gauge steel framing carries load reliably with less material and is well matched to California seismic demands.
- Does light gauge steel cost more than wood framing?
- Raw material and small-project labor often favor wood, but light gauge steel frequently wins on total delivered cost for larger or repetitive buildings once faster schedules, smaller crews, near-zero waste, and lower fire-insurance exposure are counted.
- Is steel framing better for fire safety?
- Yes. Light gauge steel is non-combustible, so it does not ignite or spread fire and is unaffected by the embers that drive most California wildfire losses, which is why it is widely chosen for fire rebuilds.
Is light gauge steel fire-resistant?
Read more- Will a light gauge steel house burn down in a wildfire?
- The steel frame itself is non-combustible and will not ignite or spread fire. Overall survival still depends on non-combustible cladding, roofing, ember-resistant vents, and defensible space, but a light gauge steel frame removes the structure from the fuel chain that drives most wildfire losses.
- Is light gauge steel allowed for fire rebuilds in California?
- Yes. Light gauge steel is a code-compliant structural system and pairs well with California's Chapter 7A wildfire-hardening requirements for cladding, vents, and assemblies in fire-prone zones.
- Is steel framing good after a fire because it does not need to dry out?
- Steel does not absorb water, rot, or grow mold, so unlike wood it does not need to dry before close-in and is not degraded by moisture during construction, which helps keep a rebuild on schedule.
How fast is light gauge steel?
Read more- How much faster is light gauge steel than wood framing?
- On the Harvard Yard project, an identical building phase framed in light gauge steel topped out in 85 working days versus 156 days in wood, a roughly 45 percent reduction in framing schedule.
- Why is prefabricated steel construction faster?
- Panels are built in a factory while site work proceeds in parallel, the work is unaffected by weather, and panels arrive ready to assemble, so a smaller field crew sets them quickly with little rework.
- Does building faster mean lower quality?
- No. The speed comes from factory precision and parallel scheduling, not shortcuts. Factory-built panels are produced to tighter tolerances than field framing, which typically improves quality and reduces callbacks.
Light gauge steel ADUs in LA
Read more- Can you build an ADU with light gauge steel in Los Angeles?
- Yes. Light gauge steel is a code-compliant framing system for ADUs throughout Los Angeles and Southern California, and its panelized, factory-built nature is well suited to building quickly on tight residential lots.
- Is a steel-framed ADU more fire-safe?
- Light gauge steel framing is non-combustible, which is an advantage for backyard ADUs that sit close to the main house and neighboring properties, and in fire-prone areas.
- Are light gauge steel ADUs good for apartment owners?
- Yes. Repeatable panelized LGS designs let apartment owners add multiple ADUs across a property efficiently, which is a core focus of the ADU Concepts multifamily ADU programs within the TESH Group platform.
LGS for hotels & senior living
Read more- Is light gauge steel good for hotels?
- Yes. A hotel's repeatable guest rooms suit panelized light gauge steel especially well, and the non-combustible, dimensionally stable structure speeds construction while supporting life safety and acoustic performance.
- Why is light gauge steel used for senior living?
- Senior-living and assisted-living communities have many similar units and demand a durable, non-combustible, low-maintenance structure, all of which favor panelized light gauge steel. We have built Merrill Gardens communities in Oakland (170,000 SF) and Huntington Beach (140,000 SF) this way.
- How large can a light gauge steel hotel be?
- Light gauge steel suits multi-story hotels, typically over a concrete podium. Our built examples include an 80,000 SF Marriott Springhill Suites in Anaheim and a 60,000 SF Hilton Garden Inn in Montebello.
Panelized vs. volumetric vs. site
Read more- What is panelized construction?
- Panelized construction builds wall, floor, and roof panels in a factory, ships them flat, and assembles them on site. It moves framing into a controlled environment for speed and consistency while remaining flexible across building types.
- What is volumetric modular construction?
- Volumetric modular builds complete three-dimensional building modules in a factory, often with finishes and systems installed, then trucks them to site and sets them on the foundation. It minimizes on-site time and suits highly repetitive housing.
- Is modular or panelized cheaper than site framing?
- It depends on the building. For repetitive designs, panelized and volumetric construction typically reduce total delivered cost through faster schedules, smaller field crews, and less waste, even when material costs are similar. For a single, irregular structure, site framing can still be the simplest choice.
LGS for mid-rise multifamily
Read more- Can you build mid-rise apartments with light gauge steel?
- Yes. Load-bearing light gauge steel is well suited to mid-rise multifamily over a concrete podium (Type III), and it is used across four-to-seven-storey residential buildings in California.
- What is podium or Type III construction?
- It is a mid-rise approach that places several storeys of residential framing over a concrete podium holding parking or retail. The residential floors above can be framed in load-bearing light gauge steel.
- Does light gauge steel add units compared to wood?
- It can. On 8th & Grand in Los Angeles, redesigning a wood scheme to load-bearing light gauge steel took the building from five to six storeys and from 500 to 700 units by eliminating double party walls and redundant staircases.
LGS seismic performance
Read more- Is light gauge steel earthquake-resistant?
- Light gauge steel is well suited to seismic design: it is strong and ductile for its weight, and a lighter structure attracts lower earthquake forces. Actual performance comes from the engineered system designed to California seismic code.
- Is steel framing better than wood in an earthquake?
- Both wood and light gauge steel can be engineered to meet California seismic code. Steel's advantages are its high strength-to-weight ratio, its ductility, and the lower seismic forces that come with a lighter structure; final performance depends on the specific engineered design.
- Is light gauge steel allowed in California seismic zones?
- Yes. Load-bearing light gauge steel is a code-compliant structural system and is engineered to the applicable California building and seismic codes for each project.
How the owned factory works
Read more- Does TESH Group own its own steel factory?
- Yes. Through Cal Steel Modular, TESH Group owns and operates an off-site steel fabrication factory that runs from master coil to finished panels and volumetric modules.
- What is roll-forming?
- Roll-forming is the process of cold-forming thin sheet steel into structural shapes such as studs, tracks, and joists by passing it through a series of rollers at room temperature.
- What is the difference between panels and modules from the factory?
- Panels are flat wall, floor, and roof assemblies that ship flat and are erected on site. Modules are complete three-dimensional building sections built in the factory and set on the foundation. Both are produced from the same owned light gauge steel.
Chapter 7A and WUI code, explained
Read more- Does my fire rebuild have to comply with Chapter 7A?
- If your lot is in a designated wildland-urban interface fire area or fire hazard severity zone, your rebuild will be designed and permitted to Chapter 7A (or the residential equivalent, Section R337). Your designer and local building department confirm the exact requirements for your parcel.
- Is light gauge steel required by Chapter 7A?
- No. Chapter 7A regulates ignition resistance of assemblies, not a specific framing material. Light gauge steel is not mandated, but as a non-combustible structural system it is an excellent match for Chapter 7A construction.
- What is the wildland-urban interface (WUI)?
- The wildland-urban interface is where development meets undeveloped, fire-prone vegetation. Homes in these areas face elevated wildfire exposure, which is why California applies Chapter 7A hardening requirements there.
Insurance and steel fire rebuilds
Read more- Can I use my fire insurance payout to rebuild in light gauge steel?
- Generally yes. Most policies pay to rebuild a comparable, code-compliant home and leave the framing material to the homeowner, so insurance proceeds can typically fund a light gauge steel rebuild. Confirm the specifics with your carrier.
- Will building with non-combustible steel lower my insurance premium?
- It can help, because some insurers view non-combustible, hardened construction as lower risk, but premiums depend on many factors and the carrier. We do not guarantee a premium reduction; ask your insurer how they treat non-combustible construction.
- What coverage should I check before planning a steel rebuild?
- Review your dwelling limit, whether you have replacement cost or extended replacement cost, and whether you carry ordinance or law (code-upgrade) coverage. These determine how much of a code-compliant, hardened rebuild your policy will fund.
Fire rebuild timeline, step by step
Read more- How long does a fire rebuild take in California?
- It varies widely with debris removal, design, permitting, and construction, so there is no single number. The reliable way to shorten it is to run work in parallel where possible, which is exactly what prefabricated light gauge steel enables during the framing phase.
- Can permitting and fabrication happen at the same time?
- Engineering and factory fabrication of light gauge steel components can be advanced while site and permitting work proceed, so that finished panels or modules are ready to erect once approvals and the foundation are complete. Sequencing depends on your jurisdiction and project.
- Does a steel frame speed up the rest of construction too?
- It helps. Steel does not shrink, warp, or need to dry out, so finishes go on flat and callbacks drop, and the dimensional consistency of factory-built components speeds close-in compared with field-cut wood.
Eaton fire rebuild (Altadena)
Read more- Can I rebuild my Altadena home with steel using insurance proceeds?
- In most cases yes, because policies generally pay to rebuild a comparable, code-compliant home and leave the framing material to the homeowner. Confirm the specifics with your carrier; see our guide on insurance and steel fire rebuilds.
- Is light gauge steel a good fit for the Eaton fire burn area?
- It is a strong fit. The area is subject to wildfire and seismic exposure, and non-combustible light gauge steel addresses ember ignition while performing well in earthquakes, all within Chapter 7A-compliant assemblies.
- Can steel framing speed up an Altadena rebuild?
- Yes. Because light gauge steel is prefabricated, factory fabrication can run in parallel with site and permitting work, which helps a rebuild proceed even when the whole community is rebuilding and field labor is scarce.
Palisades fire rebuild
Read more- Is light gauge steel suitable for coastal Palisades homes?
- Yes. Steel does not rot or attract pests and is dimensionally stable, which is an advantage in a coastal environment, and pairing it with appropriate corrosion-resistant detailing produces a durable, non-combustible home.
- How are steep Palisades hillside rebuilds framed?
- Hillside rebuilds typically combine structural (hot-rolled) steel for the foundation and primary frame with light gauge steel for walls, floors, and roof, engineered together to handle grade, soils, and seismic demand while keeping the structure non-combustible.
- Can I rebuild in steel after the Palisades fire with my insurance?
- In most cases yes, since policies generally pay to rebuild a comparable, code-compliant home and leave the framing choice to the homeowner. Confirm the details with your carrier; see our insurance and steel fire rebuild guide.
Malibu fire rebuild
Read more- Is light gauge steel a good choice for Malibu's coastal environment?
- Yes. Steel does not rot or attract pests and stays dimensionally stable, and with corrosion-resistant detailing it makes a durable, non-combustible home well suited to a coastal setting.
- How are steep Malibu hillside homes rebuilt in steel?
- Hillside rebuilds commonly combine structural (hot-rolled) steel for the foundation and primary frame with light gauge steel for walls, floors, and roof, engineered together to manage grade, soils, and seismic loads while keeping the home non-combustible.
- Can steel framing help a Malibu rebuild stay on schedule?
- Yes. Light gauge steel is prefabricated, so fabrication can run in parallel with site and permitting work, and the frame is not degraded by weather during construction, both of which help on constrained coastal and hillside sites.
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