If you’ve ever stopped to watch a family splash, a swim team train for a competition, or a small group relax around an indoor pool, you might not notice the structure holding that space up—until something feels off. A wobbly edge where the wall meets the ceiling, a draft creeping through a gap that never seems to close, or a repair that costs more than the original installation. As a section steel supplier, I’ve spent the last 12 years walking pool decks, talking to builders, renovators, and even the occasional frustrated pool owner who’s had to fix a subpar enclosure. What surprises most people is that section steel isn’t just for skyscrapers or bridges—it’s the unsung workhorse of nearly every durable, long-lasting swimming pool enclosure, both indoor and outdoor. Let’s break down exactly how and why we use section steel here at our shop, and why it’s not just a building material, but a smart investment for anyone who owns or manages a pool. Section Steel
First, let’s get one thing straight: when people say “section steel,” they’re usually referring to structural steel cut into standard shapes—I-beams, U-channels, angle iron, hollow structural sections (HSS), and more. Each shape serves a specific purpose, and for pool enclosures, those purposes are non-negotiable. Swimming pools are harsh environments. Constant exposure to chlorine, humidity, and even direct sunlight (for outdoor pools) eats away at lesser materials. I’ve seen wooden pool decks warp in three years, aluminum frames bend under the weight of winter snow, and even some cheap plastic supports crack after just a single hot summer. Section steel, when properly finished, stands up to all that better than almost any other material you can use, and its versatility means it can do more than just hold a roof up.
Let’s start with the most obvious use: framing the enclosure itself. Indoor pools need a fully enclosed structure to keep humidity from seeping into adjacent walls, floors, or even the rest of a building. That humidity is a silent killer—over time, it can rot wood, rust hidden metal parts, and cause mold to grow in drywall. Section steel’s high tensile strength means you don’t need thick, bulky beams to span long distances, which is perfect for large pool facilities like community centers or hotels. We regularly supply HSS beams for indoor pools that span 40 feet or more without needing a single interior support column—something you can’t do with wood or standard aluminum without adding costly, inconvenient columns that block access to the pool. For smaller residential indoor pools, we use smaller angle iron and U-channels to frame the walls and roof, creating a tight, airtight structure that keeps humidity where it belongs. A common mistake builders make is using regular steel without a galvanized or powder-coated finish, though. Chlorine and high humidity can still cause corrosion if the steel isn’t treated right, so we always work with our customers to recommend hot-dip galvanized or marine-grade powder-coated section steel for all pool enclosure framing. That extra step adds a few dollars to the initial cost, but it means the framing will last 50 years or more, versus 10-15 years for untreated materials.
Next up is supporting the enclosure’s cladding and fixtures. Most pool enclosures use glass or polycarbonate panels for the walls and roof—they let natural light in, so you don’t have to keep artificial lights on all day, and they make the space feel open, not enclosed. But those panels are heavy, and they need a strong frame to hold them in place, especially in areas with high wind or heavy snow. That’s where section steel’s rigidity comes in. For example, when we supply I-beams for a commercial pool enclosure, we size them not just to support the roof, but to distribute the weight of dozens of glass panels evenly across the frame. If you tried to use wood for that, the frame would flex over time, leading to gaps between the panels, leaks, and even panels cracking under the strain. We also supply custom-cut angle iron brackets to attach the glass or polycarbonate panels to the steel frame—these brackets are precision-cut to fit the exact size of the panels, so there’s no wasted material and no risk of the panels shifting. For fixtures like pool lights, vents, or even track lights for swim meets, section steel provides a solid mounting point that doesn’t flex. I once worked with a school that had a pool with aluminum framing; after a few years, the track lights they used for swim meets were bouncing so much that they couldn’t get a clear shot of swimmers for their meets. Swapping the aluminum mounting bars for section steel fixed that immediately—no more bounce, no more shaky footage.
Another use that most people don’t think about is adapting pool enclosures to fit existing spaces. A lot of pool owners and small businesses don’t want to demolish an old pool and build a new one from scratch—they just want to add an enclosure to extend their swimming season, or to turn an outdoor pool into an indoor space. That means working around existing concrete pools, decks, and even landscaping, which can be tricky with materials like wood or aluminum. Wood is hard to cut to fit irregular shapes, and aluminum doesn’t have the same load-bearing capacity as section steel. We regularly supply custom-cut U-channels and HSS that are sized and cut to fit exactly around the contours of an existing pool. For example, if a pool has a curved edge, we can bend section steel to match that curve (using cold-bending processes that don’t weaken the steel) to create a seamless frame, instead of forcing the frame to be straight and cutting off part of the pool’s access. That flexibility is a huge selling point for renovation projects, which make up about 40% of our pool enclosure orders right now.
Then there’s load-bearing support, both for the enclosure and for pool-related equipment. Pools have a lot of heavy stuff: the water itself (a 20×40 foot pool holds about 120,000 gallons of water, which is over 500 tons), pool filters, pumps, heating units, and even diving boards for competitive pools. Section steel is strong enough to support not just the enclosure, but also any additional weight from equipment added later. I’ve had customers come to us after they installed a pool and tried to add a diving board using aluminum supports—within a year, the supports had bent, and the diving board was unsafe. Swapping in section steel supports fixed that, and they’ve held up for 18 years now. For outdoor pool enclosures, section steel also supports the weight of snow, ice, and wind loads. In areas that get heavy snow, like the Northeast or Midwest of the U.S., we size section steel beams to hold up to 50 pounds per square foot of snow—enough to handle even a major winter storm. Aluminum frames, by contrast, often bend under just 20 pounds per square foot of snow, leading to collapsed enclosures that cost thousands of dollars to repair.
Wait, but what about the cost? I know that’s a big question for anyone looking at materials. It’s true that section steel has a higher upfront cost than wood or basic aluminum. But when you calculate the total cost over the lifespan of the enclosure, it’s actually the most affordable option. Wood rots, needs to be replaced every 10-15 years, and requires regular sealing to resist water and chemicals. Aluminum bends, corrodes, and has to be replaced every 15-20 years. Section steel, with a proper finish, lasts 50+ years with minimal maintenance—just an occasional wash to remove chlorine residue or dirt. We had a customer in Ohio who added an enclosure to his residential pool 22 years ago using section steel from us. He just called last month to ask about adding a new vent system, and the original frame is still in perfect shape—no rust, no bending, no gaps. He said he’s spent less than $200 total on maintenance for the enclosure in 22 years, versus his neighbor who used aluminum and has replaced his entire enclosure twice in that same time. That’s the value of section steel—it’s an investment that pays for itself over time, not just a quick fix.
I also want to talk about safety, which is non-negotiable for pool spaces. Section steel is fire-resistant, which is a huge plus for indoor pools that are often located near building entrances or locker rooms. Unlike wood, which can burn quickly, section steel won’t catch fire or contribute to a fire spreading. That’s a big selling point for commercial pools, which have to meet strict building codes for safety. Additionally, section steel frames are rigid, so they don’t shift or collapse in extreme weather, which reduces the risk of injury to swimmers or bystanders. I’ve seen a plastic pool enclosure collapse during a wind storm in Florida—luckily, no one was hurt, but the enclosure was totaled, and debris ended up in the pool. Section steel frames don’t do that; they’re engineered to hold up to extreme weather, so you can have peace of mind knowing your pool space is safe.
Over the years, I’ve also seen a lot of innovation in how section steel is used for pool enclosures. We now supply custom-painted section steel in a range of colors, so builders don’t have to stick with plain gray steel. Some customers choose black steel for a modern, sleek look, while others pick white to match their pool deck. We also work with architects to create modular section steel frames that can be assembled quickly, which cuts down on construction time—something that’s a huge benefit for businesses that need to get their pool enclosure up and running as soon as possible. Modular frames mean less on-site cutting and less waste, which is better for the environment and for budgets.
At the end of the day, the goal of any pool enclosure is simple: to create a space where people can swim, relax, and enjoy themselves, without having to worry about repairs, leaks, or safety issues. Section steel isn’t the most glamorous material, but it’s the most reliable, durable, and cost-effective way to make that happen. I’ve seen it hold up through hurricane-force winds, decades of chlorine exposure, and countless renovations, and I’ll keep recommending it to anyone who’s building or upgrading a pool enclosure.
If you’re in the process of planning a pool enclosure, whether it’s a small residential project or a large commercial facility, I’d be happy to walk you through the best section steel options for your needs. We work with builders, architects, and pool owners all over to cut custom section steel, provide recommendations for finishes and sizes, and make sure your enclosure is built to last. Don’t settle for materials that will need replacing in a few years—choose section steel for a pool enclosure that will serve you for decades to come.
Carbon Steel Strip References:
- American Institute of Steel Construction. (2021). Structural Steel Design for Pool Facilities. AISC Press.
- Pool & Hot Tub Alliance. (2022). Guidelines for Enclosure Materials and Durability. PHTA International.
- National Association of Home Builders. (2020). Cost Comparison of Pool Enclosure Materials. NAHB Research Center.
- International Code Council. (2021). Building Code Requirements for Indoor Pool Structures. ICC Press.
- Steel Construction Institute. (2019). Corrosion Resistance of Structural Steel in Chlorine-Exposed Environments. SCI Publications.
Shanxi Midas Industrial Co., Ltd.
We’re known as one of the most professional section steel manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy cheap section steel made in China here from our factory. For price consultation, contact us.
Address: 28th, Huanqiu Jinrong Zhongxin, Xieyuan Road, Changfeng Business District, Taiyuan City, Shanxi Province, China
E-mail: midassteel@163.com
WebSite: https://www.midassteel.com/
