Hey there, if you’ve ever worked with pre-engineered buildings (PEBs) – whether as an architect, contractor, or someone who’s just managed a warehouse or workshop build – you’ve probably asked yourself at some point: do the little accessory bits actually matter for thermal performance? Like, sure, you spend big on the main steel frames, insulated panels, and HVAC, but what about those PEB accessories we supply every day – the fasteners, sealants, trim, flashing, gaskets, all that stuff? Do they just get overlooked as “minor details,” or do they actually move the needle on how energy-efficient a PEB is? PEB Accessories
As someone who’s been running this PEB accessories supply business for the better part of a decade, I’ll be real with you – early on, I used to think the same thing. My team and I would ship out all the trim, gaskets, and screws with the big panel orders, and we’d get questions about price, delivery, or lead times, but rarely about whether those parts actually affected the building’s temperature. That was until a few years back, when a client hit us with a problem: their new 50,000 sq ft warehouse was running 15°F hotter in summer than their old one, even though the insulation panels were rated the same as what their neighbor had. They were at their wits’ end, and after digging into their install, we found the issue wasn’t the panels – it was the lousy, cheap gaskets they’d sourced elsewhere that were failing. That’s when it clicked for me: these “accessories” aren’t afterthoughts. They’re the glue that makes the whole thermal system work, and skimping on them or using the wrong ones is a fast track to wasted energy and higher bills.
Let’s start with the big one: air leakage. Insulation does almost nothing if there are gaps where hot (or cold) air is seeping through. I know, I know – you’ve heard air leakage is bad, but do you realize how much of it comes from PEB accessories? Think about all the joints on a PEB: where the roof panels meet the walls, where trim pieces cover edges, where fasteners pierce the steel, and around any penetrations like vents or pipe runs. Without proper sealing at these points, air can move freely through the building envelope, and that’s called uncontrolled air infiltration/exfiltration (don’t worry, I’ll keep the jargon light, but this is the science part that matters).
Our company spends a lot of time testing this, because we’ve seen firsthand how bad gaskets can blow a project. A typical closed-cell foam gasket, for example, is designed to compress just enough when you fasten panels together to create a tight, air-tight seal. But if you use a cheap, low-density gasket, it crumbles under pressure, or it shrinks over time from UV exposure, leaving gaps. Those gaps don’t sound like much individually – a 1/8 inch gap along a 100 ft wall adds up to almost a square foot of leakage area. Multiply that by a full building, and that’s enough to make your HVAC run 30% more than it should. We once calculated for a client that switching from generic gaskets to our EPDM (ethylene propylene diene monomer) gaskets cut their summer cooling costs by 22% in the first year. That’s not a small number for a warehouse with 24/7 operations.
Next up: thermal bridging. This is another term you might have heard, but basically it’s when a material that conducts heat really well (like steel) creates a “bridge” that lets heat pass through the insulation layer, bypassing all the effort you put into insulating the walls and roof. The main frame is the obvious thermal bridge, but guess what? A lot of that heat transfer also comes from PEB accessories – specifically fasteners. Steel screws, bolts, and rivets are super conductive, and if they’re installed incorrectly (or use the wrong washer), they can create a direct path for heat to move from the outside of the building to the inside.
Wait, let’s break that down. When you fasten a roof panel to the purlin (the steel beam under the roof), you’re pushing a steel screw through the panel’s insulation layer, into the steel purlin. That’s a thermal bridge right there, unless you have the right washer and seal to break that path. A lot of cheap fastener kits come with flat steel washers, which don’t do anything to insulate that point. But our supply team always recommends using neoprene or rubber washers paired with our EPDM gaskets – these create a non-conductive layer between the steel fastener and the steel panel, stopping that heat transfer. We worked on a small manufacturing plant last year where the owner was complaining about cold spots near the roof edges in winter. The issue? They’d skipped the insulated washers to save $0.05 per fastener. Once they swapped those out, the cold spots vanished, and their heating bills dropped by 18%. That’s the thing about thermal bridging – it’s often the tiny, cheap parts that cause the biggest problems.
Then there’s moisture control, which is secretly tied to thermal performance. If water gets into a PEB’s insulation, it ruins its R-value (that’s the measure of insulation’s ability to resist heat flow, for anyone who’s new here). Wet insulation is way less effective – in fact, water can reduce the R-value of fiberglass insulation by up to 50%, and even closed-cell foam loses efficiency if it’s waterlogged. PEB accessories like flashing, sealant, and end caps are what keep moisture out of the joints and penetrations. Flashing, for example, is the thin steel strip we supply that covers the edges of roof panels where they meet walls, or around vents. If you use the wrong flashing material – like a thin, galvanized strip that rusts easily – it can crack or peel over time, letting rain get in. We once had a client who ignored our advice to use our 26-gauge pre-painted steel flashing and went with a local, cheaper strip. Within two years, flashing around their roof vents had rusted through, leading to water damage to the roof insulation, which made their cooling costs spike that summer. Replacing the flashing and drying out the insulation cost them way more upfront than just buying the right parts would have.
Now, let’s talk about a common myth I hear all the time: “Accessories are just small parts, so their impact is negligible.” I get it – when you’re looking at a 10,000 sq ft building, you’re focused on the big-ticket items: panels, HVAC, foundation. But when you add it all up, these small parts add up to a huge portion of the building’s thermal performance. According to some research I’ve followed (I’ll link the actual studies at the end, don’t worry), uncontrolled air leakage through building envelope joints accounts for 20-30% of total heating and cooling energy use in commercial buildings. And a lot of that leakage is specifically from gaps between panels, which are sealed by those PEB gaskets and trim we supply.
Another myth: “All accessories are the same.” Nope, not even close. At our company, we don’t just ship generic gaskets – we test every part for UV resistance, compression set (that’s how well they hold their shape over time), and air tightness. For example, our EPDM gaskets are rated to last 25 years, which is longer than the typical PEB’s lifespan. Compare that to a generic gasket that might shrink or crack in 5 years, and you’re looking at a huge difference in long-term performance. The same goes for fasteners: we supply coated steel and stainless steel fasteners that resist corrosion, so they don’t rust and leave gaps in joints as they age. Cheap fasteners rust, expand when they get hot, and create gaps, which leads to more air leakage and eventually, structural issues too.
Let’s also talk about specific PEB types, because thermal performance needs change depending on what you’re building. If you’re putting up a cold storage warehouse, thermal performance is non-negotiable – even a small air leak can make the refrigeration system run non-stop. In these cases, we supply specialized closed-cell foam gaskets that are resistant to chemical exposure, plus butyl sealant that’s air-tight for years. We worked with a cold storage client last year who had a problem with freezer burn on stored goods, and after checking, we found that the gaskets around their door frames (which are PEB accessories too, by the way) were leaking, letting warm air seep in and create condensation. Swapping to our custom door gaskets fixed that issue immediately, cutting their product waste by 12%.
On the flip side, if you’re building a standard warehouse or workshop, you might not need the ultra-specialized parts for cold storage, but that doesn’t mean you can cut corners. For these, our standard EPDM gaskets and neoprene washers are more than enough to keep leakage low and thermal bridging minimized. We recently did a test for a 100,000 sq ft warehouse client: when using generic accessories, their projected annual energy cost was $185,000. When they switched to our PEB accessories, that number dropped to $142,000. That’s a $43,000 annual savings, which adds up to almost half a million dollars over 10 years. Not bad for ordering the right gaskets and washers, right?
I’ve also noticed that a lot of contractors don’t realize that install quality plays a huge role too – and a lot of that comes down to the accessories. For example, if you install a gasket too tight, it can compress too much and lose its seal. If you install it too loose, there are gaps. Our team doesn’t just sell parts – we send install guides with every order, and we’re always available to walk contractors through how to fit gaskets and fasteners correctly. Because even the best accessory in the world is useless if it’s installed wrong. That’s something a lot of big supply companies don’t emphasize, but for us, it’s part of the job.
Wait, let’s address a counterpoint I’ve heard: some people say that modern insulation is so good that accessories don’t matter. But here’s the thing: even with R-30 or higher insulation, a building with high air leakage will still be uncomfortable and energy-hungry. Insulation blocks conductive and radiant heat flow, but it doesn’t stop air flow. The accessories are what block that air flow. It’s like having a thick blanket, but leaving the neck open – the blanket does nothing if there’s a gap for air to escape. That’s exactly what’s happening with bad PEB accessories.
Another thing I’ve seen: as more and more clients are focused on sustainability and energy codes, the role of PEB accessories is only getting bigger. Many areas now have strict energy codes that require commercial buildings to meet minimum air leakage rates – like 0.3 air changes per hour at 50 Pascals, for anyone who knows the standard. To meet those codes, you can’t just rely on the main panels; you have to seal all the joints with the right accessories. Using cheap, untested gaskets or flashing will almost always lead to a failing energy inspection, which can delay a project or cost you extra money to fix later.
So, putting this all together: yes, PEB accessories absolutely impact a building’s thermal performance. They control air leakage, reduce thermal bridging, protect insulation from moisture damage, and help buildings meet energy codes and save money on utility bills. The old way of thinking that they’re minor, forgettable parts is outdated – in fact, they’re some of the most important parts of the building envelope when it comes to energy efficiency.
As someone who’s in the business of supplying these parts, I want to be clear: we don’t sell our accessories as a “magic fix” for bad insulation or bad HVAC. But when paired with high-quality panels and proper installation, using the right gaskets, fasteners, flashing, and sealant can make a massive difference. We’ve seen it time and time again, from the small manufacturing plant with cold spots to the 100k sq ft warehouse saving tens of thousands a year.
If you’re working on a PEB project, whether it’s a new build or a retrofitting an old one, don’t sleep on the accessories. It’s tempting to go for the cheapest option to cut costs upfront, but the long-term energy bills and potential repairs will almost always cost you way more. We have a range of PEB accessories for every project, from standard warehouses to cold storage, and our team is always here to help you pick the right parts, provide install tips, and make sure your building is as energy-efficient as possible.
If you’re ready to get the right accessories for your next PEB project, reach out to our team to connect and discuss your needs. We’re here to help you build something that’s not just structurally sound, but comfortable and energy-efficient for years to come.
Hot Rolled Steel Strips in Coil References
- U.S. Department of Energy. (2020). Commercial Building Energy Almanac: Air Leakage Impacts. Retrieved from relevant energy efficiency publications
- National Institute of Building Sciences. (2018). Thermal Bridging in Pre-Engineered Metal Buildings. Whole Building Design Guide
- ASHRAE. (2021). Fundamentals Handbook: Envelope Air Leakage and Insulation Performance
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