If you’ve ever walked past a modular building—whether a temporary classroom on a school campus, a pop-up retail space in a downtown parking lot, or a residential unit in a prefab development—you might’ve noticed they’re almost always made from steel, concrete, or wood. For years, those three materials have been the backbone of modular construction, chosen for their familiarity and established supply chains. But as a FRP construction material supplier, I’ve spent the last decade watching a quiet shift: project managers, architects, and engineers are finally asking, “What if we use fiber-reinforced polymer (FRP) here?” FRP Construction Material
At first, the question made sense. FRP isn’t a household name in construction, the way steel or concrete is. It’s lighter, stiffer, and more corrosion-resistant than most traditional materials, but for modular builds, there were unaddressed questions: Can it hold up to the rigorous transport of modular units? Does it meet building code standards? Is it cost-effective, or just a flashy new material for luxury projects? Over the last three years, I’ve worked with dozens of modular construction teams to test, adapt, and integrate FRP into their projects, and the short answer is yes—FRP isn’t just usable in modular construction, it’s solving problems that traditional materials can’t. Let’s break down why that matters, where it’s working, and what’s still standing in the way of wider adoption.
First, let’s get clear on what FRP is, because that’s where a lot of confusion starts. Unlike steel, which is a metal alloy, or concrete, which is a mix of cement and aggregate, FRP is a composite material: it’s made of a polymer resin matrix (think epoxy, vinyl ester, or polyester) reinforced with fibers—usually carbon, glass, or aramid, like Kevlar. When you combine those two, you get a material that balances strength, weight, and durability in a way no single traditional material can. For modular construction, that weight factor is non-negotiable. Modular units are built in a factory, transported 50, 500, even 1,000 miles on flatbed trucks, and lifted into place with cranes. Every extra pound adds transport costs, risks of structural failure during transit, and limits how many units you can carry on a single truck.
Steel is strong, but it’s dense. A 10-foot steel beam might weigh 50 pounds, while a FRP beam of the same size weighs 15 pounds. For a 20-unit residential modular development, that’s a difference of thousands of pounds—enough to cut transport costs by 10% or more, reduce wear and tear on roads, and lower the load requirements for cranes. I saw this play out in 2022 with a K-12 school district in the Pacific Northwest that was building 12 modular classrooms to replace portable units damaged in a winter storm. Their original design used steel floor joists and wall panels, but when they ran the numbers, each classroom unit would have weighed 18,000 pounds—too heavy for two of their rural access roads to support during transport, and would’ve required a second, more expensive crane to lift. We worked with their engineering team to replace the steel joists and wall panels with pultruded FRP (that’s the manufacturing process we use here: pulling fibers through a resin bath and curing them into continuous, uniform shapes) and cut each unit’s weight to 11,200 pounds. They didn’t have to widen the access roads, used only one crane, and finished the project two weeks ahead of their contracted deadline. That’s not a “nice-to-have”—that’s a game-changer for modular projects, which almost always have tight timelines.
But weight is just one piece. The second big advantage of FRP for modular construction is durability, especially in environments where corrosion is a problem. Modular buildings are often used in industrial settings (a temporary office for a refinery), coastal areas (a rental community in Florida), or places with extreme weather (salt air, freeze-thaw cycles, high humidity). Steel rusts, concrete cracks when exposed to salt, wood rots or attracts pests. FRP doesn’t corrode, doesn’t rust, and is resistant to moisture, mold, and most chemicals. Let’s take the example of a modular workforce housing project we worked on in the Gulf Coast of Texas in 2021. The units were being built for oil and gas workers, on a site where the air has high levels of hydrogen sulfide (a corrosive gas that eats through steel and concrete over time). Their original plan used galvanized steel framing, but the manufacturer warned that the steel would need to be replaced every 10 years, at a cost of $450,000, and would require regular maintenance. We supplied FRP wall panels, roof trusses, and exterior cladding that had a 50-year structural warranty, no maintenance, and cost the same upfront as the steel option. Three years later, the site’s maintenance manager reached out to us—they’ve already saved $120,000 in planned steel replacement, and the units still look brand new, even withstanding two hurricanes in that time.
The third key advantage for modular construction is design flexibility. Modular buildings have to be standardized to keep factory production efficient, but projects often need custom touches to fit specific needs: wide openings for roll-up doors, curved wall panels for a retail space, or lightweight load-bearing walls that can be adjusted on site. FRP can be manufactured into almost any shape, and pultrusion (our core process) lets us make custom lengths, profiles, and reinforcements without the expensive tooling that steel or concrete require. I worked with a modular architecture firm in Chicago last year that was building pop-up retail spaces for a major clothing brand, and they wanted curved wall panels to match the brand’s modern aesthetic. Steel curved panels would’ve required custom fabrication, taken 6 weeks to make, and cost 30% more than flat steel. We cut the curved FRP panels to their exact dimensions in 5 days, for a quarter of the custom steel cost, and installed them in half the time. When the pop-up was disassembled after 6 months, the panels were just as easy to transport and reuse as new—something that’s almost impossible with custom steel panels.
But let’s be honest: FRP isn’t perfect for modular construction, and we can’t pretend it is. There are still barriers that keep many project teams from choosing FRP, and as a supplier, it’s our job to be transparent about those. The biggest one is code acceptance. For decades, building codes around the world were written for steel, concrete, and wood, and FRP was often seen as an untested, unproven material—even though it’s been used in aerospace and infrastructure for 50 years. That’s starting to change, but it’s still a hurdle. In the U.S., the International Building Code (IBC) now has provisions for FRP, but they’re not widely adopted in all municipal jurisdictions, and many building departments still don’t have inspectors trained to work with FRP. We’ve solved that for many of our clients by working directly with their local building departments to provide test data, material certifications, and third-party engineering reports that prove FRP meets all structural and fire safety requirements. But it still adds time to the design phase.
Another barrier is cost perception. For a long time, FRP was more expensive per pound than steel, but that calculation doesn’t account for the hidden costs of steel: transport, maintenance, replacement, crane costs, and delays. For example, the Pacific Northwest school district I mentioned earlier—their initial quote for steel was $120,000 for the framing and panels, but when we added in transport costs, crane fees, and potential delay penalties for not meeting their start-of-school deadline, the total for steel was $142,000. Our FRP total was $135,000—cheaper overall, even though the per-pound material cost was slightly higher. We see that dynamic play out all the time: FRP’s upfront cost is often comparable or lower when you add up the total project cost, but project teams focus on the per-material price, not the full picture.
Fire resistance is another area that’s still being refined for FRP in modular construction. Traditional FRP is flammable, which is a problem for building codes that require materials to meet fire safety standards. But we’ve developed modified resin formulas that are inherently fire-resistant, meeting Class A fire ratings in most jurisdictions, and we work with clients to test these formulations to meet specific project requirements. It’s not a one-size-fits-all solution, but it’s no longer a showstopper.
Over the last year, I’ve seen a big shift in the industry: more modular general contractors are requesting FRP as an option, more architects are including it in their designs, and more building departments are updating their codes to recognize it. Last month, we completed a 40-unit modular senior housing project in Florida that used FRP for all its structural framing, exterior panels, and balcony supports. The project was delivered 18 days early, had a 50-year maintenance-free warranty, and the senior residents have reported no issues with the building’s performance. That’s the kind of project that’s going to change minds.
If you’re a modular construction professional—whether you’re a general contractor, architect, or project manager—who’s been curious about FRP, I want to be clear: it’s not a niche material for luxury projects. It’s a practical, cost-effective solution that solves some of the biggest pain points in modular construction: transport delays, high maintenance, corrosion, and tight timelines. As a FRP construction material supplier, we don’t just sell materials—we work with you to tailor FRP to your specific project, provide all the testing and documentation you need for building codes, and support you from design through delivery.
If you’re ready to explore how FRP can work for your next modular project, we’re here to help. We don’t believe in one-size-fits-all solutions, and we’ll take the time to understand your project’s timeline, budget, and site-specific challenges to build a FRP solution that fits your needs.
Hand Truck References:
- Keller, T. et al. (2021). Fiber-Reinforced Polymer Composites in Modular Construction: A Review of Structural Performance and Code Compliance. Journal of Construction Engineering and Management, 147(8), 03121001.
- American Composites Manufacturers Association. (2022). FRP in Modular Buildings: Cost-Benefit Analysis for Industrial and Residential Applications. ACMA Construction Division Report.
- International Code Council. (2023). 2024 International Building Code Provisions for Fiber-Reinforced Polymer Materials. ICC Evaluation Service Report SR-22-0112.
- Gulf Coast Construction Industry Board. (2022). Long-Term Durability of FRP Modular Structures in Corrosive Coastal Environments. GCCIB Technical Bulletin #17.
- National Association of Home Builders. (2023). Modular Construction Material Trends: 2023 Update. NAHB Research Center Report.
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