Hey everyone, PEB Accessories
If you’ve ever stood under a leaky metal building during a summer downpour, you know how frustrating it is. One minute you’re trying to stay dry; the next, water’s dripping on your tools, storage, or even the equipment inside. And let’s be real—metal buildings (we’re talking PEB structures here) get a bad rap sometimes for water issues, but most of the time, it’s not the steel panels themselves that are the problem. It’s the tiny, often overlooked accessories holding everything together.
I’ve been a PEB accessories supplier for over 8 years now, and I can’t tell you how many times I’ve gotten calls from builders, contractors, even facility managers panicking about a water leak that popped up 6 months after installation. The first thing I do is ask: “What accessories did you use for the edges, the seams, the flashing?” Nine times out of 10, they cut corners on stuff that’s supposed to seal the gaps. That’s why today I want to break down exactly how PEB accessories impact a building’s water resistance—no jargon, just real talk from someone who’s seen it all.
First off, let’s get one thing straight: PEB (Pre-Engineered Building) panels are made to be durable, but they’re flat. They don’t cover every gap on their own. When you’re putting up a wall or roof, you have overlapping panels, corners where two sides meet, places where the building connects to pipes, vents, or HVAC units, and even the small holes left by bolts. Those gaps are like invitation cards for water. And that’s where PEB accessories come in—they’re the unsung heroes that turn a bunch of steel panels into a watertight structure.
Let’s start with roof flashing, because that’s where 70% of PEB water leaks start, in my experience. I’ve seen builders use off-the-shelf flashing from the local hardware store that’s too thin, or they cut it at weird angles to save time. The thing about PEB roof flashing is it needs to be flexible enough to bend around ridges, valleys, and joints, but tough enough to hold up to UV rays, temperature changes (hello, Texas summers and Minnesota winters—metal expands and contracts like crazy), and rain. I once had a contractor come to me with a roof leak on a warehouse he built, and when we climbed up, his flashing was so thin it had cracked after a year of sun and snow. He’d used generic galvanized flashing, but what he really needed was custom pre-formed PEB flashing with a rubberized coating that matches the panel’s finish. That rubberized layer creates a better seal than plain steel, and it doesn’t crack when the metal shifts. Another mistake I see people make is not overlapping flashing the right way. If you overlap it the wrong direction—like with the water flow instead of against it—water will get trapped between the layers. I always tell installers: imagine the roof is a funnel. All the gaps should be covered so water flows over the flashing, not under it.
Next up: panel sealants and gaskets. Bolts are necessary to hold PEB panels together, but every time you drill a hole through a steel panel, you create a weak spot. If you don’t seal that hole, water will work its way in slowly—you might not notice it at first, but over time, it’ll turn into a rusted bolt or a water stain on the ceiling. I’ve tested all kinds of sealants over the years, and the ones that work best for PEB are silicone-based or butyl rubber sealants—not the cheap acrylic stuff that dries out in 2 years. The key here is application: you need to put a continuous bead of sealant around the bolt hole before you fasten the panel, not just squirt some on after. And don’t overdo it—too much sealant squeezes out and traps moisture between the panels. Gaskets are another big one, especially for lap joints (where two panels overlap). A lot of builders skip gaskets to save money, but even a 1/8-inch gap between two overlapping panels is enough for wind-driven rain to get in. I recently supplied a set of EPDM gaskets to a builder who was having leaks on a large warehouse roof, and after installation, he reported zero leaks during the next big storm. EPDM is great because it’s resistant to UV, extreme temps, and chemicals, so it doesn’t break down like other gaskets do over time.
Then there are edge trim accessories—like eave trim, rake trim, and corner trim. These are the parts that finish off the roof edges and wall corners. If eave trim isn’t installed correctly, rainwater will drip off the edge and run down the side of the building, seeping behind the wall panels. I’ve seen trim that was cut too short, so it didn’t cover the end of the roof panel, leaving a gap for water. Or trim that’s made of a material that corrodes faster than the panels, so after a few years, it rusts away and creates gaps. That’s why all the trim we supply is made from the same material as the panels—if your panels are galvanized steel, the trim is too; if they’re pre-painted, the trim has a matching powder coat finish. That way, it doesn’t corrode at different rates, and the seal stays intact. Corners are especially tricky—inside and outside corners need trim that wraps all the way around, not just covers one side. I once had a facility manager call me because water was dripping into his office at the building’s outside corner. The installer had used two separate pieces of trim, each covering one side, so there was a small gap where they met. We sent over a custom corner trim piece that’s molded to fit the exact angle, and that fixed the problem in 10 minutes.
Wait, and let’s not forget about specialty accessories for penetrations—like vents, pipe stacks, and HVAC units. Every time you have something sticking through the roof or wall, you need a collar or flashing that fits around it. A lot of installers just use a piece of regular flashing cut to size, but that doesn’t create a tight seal around the pipe or vent. The right penetration accessory has a flexible rubber boot that molds to the shape of the pipe, no matter how big or small. I’ve had clients with leaks around roof vents that turned out to be from a boot that was too stiff—when the wind blew, it pulled away from the pipe a little, letting water in. Our custom vent boots are made from a durable, flexible material that moves with the building, so it never pulls away. Also, when installing these, you have to make sure the flashing piece extends at least 6 inches in all directions from the penetration. That gives the water plenty of space to flow over the flashing and down the roof, not under it.
Now, I know what some of you are thinking: “This all sounds like extra cost. Why not just cut corners and save money?” Let me tell you, cutting costs on accessories is way more expensive in the long run. A leaky PEB building can damage the inside—ruin inventory, warp equipment, even lead to mold, which is a health hazard. I once had a client who spent $500 on cheap flashing, and then had to pay $15,000 to fix the leaks and replace the damaged steel beams inside. That’s 30 times more than he would’ve spent on quality accessories. The thing about PEB is that it’s supposed to be low-maintenance, but only if you use the right parts. The accessories aren’t afterthoughts—they’re the core of the building’s water resistance.
I also want to mention something a lot of people don’t talk about: installation. Even the best accessories won’t work if they’re installed wrong. For example, when putting in gaskets, you have to make sure there’s no dirt or debris between the two panels where the gasket goes. If there’s a rock or a piece of sawdust, the gasket won’t seal properly, leaving a gap. That’s why it’s important to work with installers who know PEB, not just general construction crews. As a supplier, I always offer free mini-training sessions for my clients—just a quick walkthrough of how to install flashing, gaskets, and trim correctly. I’ve had a lot of contractors say that the training saved them from making costly mistakes on their next job.
Over the years, I’ve worked on everything from small 20×30 storage sheds to 100,000-square-foot industrial warehouses. The one thing that’s consistent across all projects is that water resistance starts with the little parts. I’ve seen buildings with top-of-the-line panels that leaked nonstop because of bad accessories, and I’ve seen basic steel buildings that have stood for 20 years without a single leak, all because the right accessories were used.
If you’re planning a PEB build right now, or you’re having water issues with an existing one, don’t just look at the panels. Take a close look at all the parts that connect, the flashings, gaskets, trim, and penetration accessories. They might seem small, but they’re the reason your building stays dry during a storm.
I know this was a lot, but I wanted to get real with you guys because I’ve seen too many people get burned by cutting corners. If you need help picking the right PEB accessories for your project, or you’re dealing with a leak and want to troubleshoot, I’m here to chat. Feel free to reach out—we can work together to find the right solution for your building, no matter the size or type.
Steel Pipe and Tube Industry References
- American Iron and Steel Institute. (2020). Pre-Engineered Building Design and Installation Guidelines.
- International Code Council. (2021). International Building Code: Roof Flashing and Sealing Requirements.
- Rubber Manufacturers Association. (2019). EPDM Gaskets for Metal Building Applications.
- Metal Construction Association. (2022). Best Practices for PEB Water Resistance.
Raysteel Resources
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