Hey there, it’s Jake from [Your Company Name]—we’ve been manufacturing and delivering high-quality purlins and girts for over a decade, and I lose count of how many times we’ve gotten this exact question: “Can purlins and girts even be used in commercial buildings?” For a long time, a lot of folks tied these structural steel elements to warehouses, industrial sheds, or agricultural barns. But if you’ve walked past a new strip mall, a community rec center, or even a mid-sized office building in the last few years, you’ve probably spotted them without even realizing it. Let’s break this down, no jargon, no fluff—just what I’ve seen on job sites and what our clients (architects, general contractors, facility managers) rely on us for every single day. Purlins & Girts
First, let’s get the basics right for anyone who might be new here. Purlins are the horizontal beams that sit on the roof trusses or rafters of a building, right? They support the roof sheathing—whether that’s metal panels, asphalt shingles, or even insulation board that goes under a finished roof. Girts are the same core structural concept, but they’re for walls: they run horizontally along the building’s frame, holding up wall panels, exterior cladding, and even the insulation that keeps commercial spaces temperature-controlled. For decades, these were thought of as “secondary structure” — the stuff that’s not the big steel frame holding the building up. But here’s the thing: good purlins and girts aren’t an afterthought. They’re what keeps the building’s exterior intact, distributes loads evenly, and makes sure the space inside stays functional for years.
Now, let’s talk commercial buildings specifically. When most people think commercial, they think big box stores, medical offices, grocery stores, restaurants, school buildings, public libraries—stuff that needs to meet strict safety codes, look professional, and hold up to all kinds of weather, foot traffic, and daily use. A lot of these structures use steel framing, and purlins and girts are the backbone of that steel system. Let’s start with load requirements, because that’s where a lot of architects used to hesitate. Commercial roofs have way more weight than residential roofs. You’ve got HVAC units on top, solar panels more and more these days, snow loads in places like the Midwest and Northeast, rainwater buildup, and even maintenance workers walking on the roof to service equipment. Purlins are engineered to carry all that extra load—we use a mix of standard Z-shaped and C-shaped purlins (that’s the industry standard) that are sized to match the specific project’s local code and load needs. For example, a grocery store in Chicago needs purlins that can handle 50 pounds per square foot of snow, plus a rooftop HVAC unit that weighs 10,000 pounds, while a small retail shop in Florida just needs to handle wind resistance for hurricanes. Girts do the same for walls: they support the weight of exterior cladding (like metal panels or composite stone) and resist wind uplift that can pull a wall apart during a storm. We’ve had clients build school buildings in Houston where our girts are rated for 130 mph wind speeds, and they’ve stood through multiple hurricanes without a single issue.
Wait, but what about the aesthetic side? A lot of people assume commercial buildings need fancy, finished structural elements, not raw steel purlins and girts. But here’s a secret I’ve learned on job sites across the country: purlins and girts are almost always hidden from view. They’re covered by roof sheathing, wall cladding, ceiling tiles, or interior finishes. The only time you might see them is in a large open space, like a warehouse gym or a big box store’s interior, where the roof structure is left exposed for an industrial look. Even then, architects can specify primed or painted purlins and girts that match the building’s color scheme, or add insulation that covers them completely. I worked on a community rec center in Denver a couple years ago, and their architects wanted the high school gym’s interior to have an industrial vibe, so we supplied our powder-coated purlins in a matte gray that complemented the exposed steel frame. It looked intentional, not like an afterthought, and the client saved thousands of dollars by using steel purlins instead of more expensive lumber beams they would have had to source and treat separately.
Durability is another big win for commercial buildings, which need to last 30, 40, even 50 years or more. Lumber purlins and girts are super common in residential construction, but they have a lot of downsides for commercial use. They rot, get eaten by termites, warp if there’s a leak in the roof, and need regular maintenance like painting or sealing every few years. Steel purlins and girts? They’re galvanized by default to resist rust, and even if you need a custom coat for aesthetic reasons, they hold up way better. We supply our standard purlins with a G90 galvanized coating, which is the industry standard for structural steel, and that means they can handle moisture, humidity, and even road salt from winter snow removal for decades. A client built a 10-story parking garage in Cleveland a few years back—parking garages are brutal on structural materials, what with all the moisture, salt, and car exhaust. They used our galvanized girts for the walls, and five years later, they haven’t had to replace a single one. That’s a huge cost saver over time, which is a big deal for commercial facility managers who have to stick to tight budgets for repairs and upkeep.
Let’s get into specific commercial use cases to make this real, because I’ve seen every type of project. First, big box retail: think Walmart, Target, or Home Depot. These buildings are 100% steel-framed, and their roofs are huge, spanning hundreds of feet without interior supports. Purlins run the length of the building every two to three feet, holding up the metal roof panels. They’re sized to carry the weight of the store’s rooftop refrigeration units, which are non-negotiable for keeping groceries cold. Girts line the walls, supporting the large glass storefronts and the exterior metal siding. Last year, we supplied over 200 tons of purlins and girts for a new Walmart in Arizona, and the project was completed on time and under budget—because our products are pre-cut to exact lengths, which saves general contractors hours of on-site fabrication time.
Next, healthcare facilities. Hospitals and clinics have super strict safety codes, especially for fire resistance and structural integrity. Steel is non-combustible, so purlins and girts made of steel help buildings meet life safety codes that lumber can’t. A hospital in Tampa we worked on a few years back needed their new outpatient wing to have a roof that could hold a rooftop helipad. Wait, yes—helipads add massive extra weight, so the purlins have to be extra thick and engineered to handle that load. We supplied heavy-gauge Z-purlins that were tested to support the weight of a medical helicopter, and the project passed all local building code inspections on the first try. That’s the kind of reliability we live for—our clients don’t have to worry about a last-minute inspection failure that delays opening a new wing.
Then there’s education: elementary schools, high schools, community colleges. These buildings are used by thousands of people every day, so they need to be safe, low-maintenance, and energy-efficient. Girts for school walls are often paired with insulation that helps reduce heating and cooling costs, which is a big plus for school districts working on tight annual budgets. A school district in Iowa used our girts for three new elementary schools a few years ago, and their energy bills dropped by 15% compared to their old schools with lumber-framed walls. That’s money they can put back into classroom supplies, sports programs, and teacher salaries.
Wait, but what about common misconceptions? I’ve heard architects and contractors say, “We can’t use purlins and girts because our building has a flat roof.” No—flat roofs actually rely more on purlins than sloped roofs, because they have to handle more water buildup. We supply specialized purlins for low-slope roofs that have a higher load rating for standing water. Another myth: “Purlins and girts are only for temporary buildings.” No way—we supply structural purlins and girts for permanent commercial buildings that are designed to last 50+ years. The key is working with a supplier who engineers each set to match your specific project, not just grabbing a one-size-fits-all product.
Let’s talk about cost, because that’s the number one concern for any commercial project. I know a lot of contractors assume that using steel purlins and girts is more expensive than lumber, but that’s not always the case when you factor in long-term costs. Lumber needs to be treated for rot and pests, which adds to the upfront cost, and it has to be replaced every 10 to 15 years in humid or snowy climates. Steel purlins and girts are a one-time purchase that lasts for decades. Also, prefabricated purlins and girts are cut to exact lengths in our factory, so there’s almost no waste on the job site. We’ve had clients tell us that using our products cut their framing labor time by 20% because they don’t have to cut lumber on site or deal with warped or uneven pieces. That’s real money saved on a project that can easily run into millions of dollars.
Another big benefit: sustainability. Commercial building owners are increasingly focused on green building certifications like LEED, and steel is one of the most recycled materials on the planet. Over 90% of structural steel in the U.S. is recycled, so when you use steel purlins and girts, you’re helping your project earn LEED points for material sustainability. We also source our steel from mills that use 100% recycled steel for most of their products, so you can feel good about choosing materials that have a lower carbon footprint than lumber in many cases. I worked on a LEED-certified grocery store in Oregon a couple years ago, and our purlins and girts were a big part of their material documentation for their LEED application. That’s a huge selling point for clients who want to build sustainable commercial spaces.
Now, I’ve seen my share of projects that went wrong because they used the wrong purlins or girts. A few years back, a general contractor in Texas tried to cut costs by using under-sized girts for a retail strip mall. A few months after opening, a strong thunderstorm hit, and the girts buckled, pulling part of the wall siding off. The contractor had to replace all the girts at their own cost, which ended up being twice as much as if they’d ordered the right size from the start. That’s why working with a reputable supplier like us is so important—we don’t just sell you a piece of steel. We’ll help you calculate exactly what size purlins and girts you need based on your project’s location, load requirements, and building code. We do free load calculations for every commercial project, so you don’t have to guess if your structure is going to hold up.
So, to circle back to the original question: Can purlins and girts be used in commercial buildings? The short answer is a resounding yes—they’re used in nearly every type of commercial building you walk into, from the grocery store you shop at to the hospital where you get care to the school your kid attends. They’re durable, cost-effective, customizable, and meet all the strict safety and code requirements that commercial buildings need. They’re not an afterthought—they’re the structural backbone that makes a commercial space functional, safe, and long-lasting.
If you’re an architect working on a new commercial project, a general contractor looking for reliable structural materials, or a facility manager needing to replace old purlins or girts, we’re here to help. We’ve worked on projects big and small, from a 5,000-square-foot retail shop to a 500,000-square-foot distribution center, and we can supply purlins and girts tailored exactly to your needs. We know how important timelines are for commercial projects, so we keep our most common sizes in stock and can ship anywhere in the country quickly. No runaround, no hidden fees, just honest advice and quality structural steel products.
Don’t hesitate to reach out to us to discuss your next commercial project’s purlin and girt needs. We’d be happy to walk you through load requirements, material options, and help you find the right solution for your budget and timeline. There’s no such thing as a “too small” or “too big” project for our team.
Steel Connection Plates References
- American Institute of Steel Construction. (2022). Steel Purlins and Girts Design Manual.
- International Code Council. (2021). International Building Code (IBC) Chapter 22: Steel Structures.
- Steel Recycling Institute. (2023). Sustainability of Structural Steel in Commercial Construction.
- National Association of Home Builders. (2022). Commercial Framing Material Comparison: Steel vs. Lumber.
GNEE Steel Structure (Tianjin) Co., Ltd.
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