It’s common knowledge that metal panels are one of the most durable options you can choose for roofing. But how do we actually know they are as strong as we say they are? How can you know a panel will hold up to a freak summer hailstorm or a strong gust of Livingston winds? That’s where metal roof panel testing comes into play.
Every panel profile that Great Northern Metal Company manufactures has undergone a series of tests by our partners at Sheffield Metals. These tests determine how well each panel type performs under a specific set of conditions, so you can trust your selected panel will perform how you need it to for your project.
The landscape of metal panel testing and industry standards is complex, so we’ve broken down the common factors and tests to pay attention to for Montana metal roofing projects. By the end of this blog, you’ll better understand:
- The importance of metal panel testing
- How consultations can help you choose the best panel with the right testing
- Common tests to pay attention to for Montana roofing projects
The Importance of Metal Panel Testing
When you’re specifying a roof system, performance claims need to be backed by real data. That’s where metal roof panel testing matters most. Testing gives project engineers, architects, and even homeowners a documented way to evaluate whether a panel is appropriate for the building, the site conditions, and the code requirements tied to the project.
Without testing, you’re relying on assumptions. With testing, you have a clearer picture of how a panel performs when exposed to fire, wind uplift, impact, hail, and water intrusion. That kind of information helps reduce uncertainty early in design and helps avoid problems later in construction or after occupancy.
This is especially important in Montana, where roofing systems often face harsher weather conditions than many other parts of the country. Wind exposure, snow, moisture, and seasonal storms all put pressure on a roof system. A panel may look right on paper, but if it has not been properly tested for the conditions it may face, appearance alone does not tell you much.
Testing also helps support smoother submittal review. Engineers, architects, and contractors need confidence that the selected panel has a performance record behind it. Having access to that information makes it easier to compare options, verify compliance, and move forward with fewer surprises.
Why We Don’t Use Panels That Haven’t Passed Testing Standards
At Great Northern Metal Company, we do not use panels that have not passed the relevant testing standards for their intended application. There is too much at stake to treat testing like an optional box to check.
A panel that fails testing or has no clear testing data behind it can create real issues on a project. It can raise questions during design review, slow down approvals, complicate installation decisions, and increase the risk of performance problems after the roof is in place. For owners, that can mean more maintenance, more repairs, and a shorter service life than expected. For design teams, it can mean more headaches and less confidence in the final assembly.
There is also a cost to using the wrong product. That cost does not always show up on the initial quote. It often shows up later through callbacks, premature wear, leak investigations, replacement work, or time spent sorting through avoidable issues. A lower-cost panel with weak or incomplete testing data can end up being the more expensive choice once the full life of the roof is considered.
That’s why we stay focused on tested products from trusted partners like Sheffield Metals. When a panel has passed the right testing standards, you have a stronger starting point for specifying a system that can do its job in the real world.
Tests & Standards Can Change from Panel to Panel
One of the biggest misconceptions around metal roof panel testing is the idea that one result applies to every panel across every application. Unfortunately, it doesn’t work that way.
Metal roof panel testing is highly specific. Results can change based on the panel profile, material type, gauge, substrate, attachment method, clip system, underlayment, deck type, and even the exact assembly used during the test. A panel that performs one way in one tested setup may not carry that same performance in a different configuration.
That is why it is important to review testing information at the panel level instead of assuming all metal panels perform the same. Two profiles from the same manufacturer can have different ratings. The same profile can also have different results depending on how it is installed or what assembly it is part of.
If you are reviewing options for a project, start with the product brochures. Those materials often show what testing a panel has gone through and what ratings are available for that profile. If you do not see the information you need, ask us. Our team can help provide the testing details tied to the panel you are considering so you can make a better-informed decision.
When in Doubt, Chat with Our Team
Panel testing can get technical fast. That’s normal! Most projects involve more than simply picking a panel that looks good or fits a budget. You also need to make sure the system lines up with project requirements, environmental conditions, and performance expectations.
That’s where a consultation really helps. Our team can walk through your project, talk through what matters most for the site, and help narrow the field to panels with the right testing behind them. If a brochure does not answer your question, we can help fill in the gaps. If you want to understand whether a specific panel is appropriate for a certain condition, we can talk through that, too.
You should not have to guess your way through metal roof panel testing. If questions come up, just ask us!
Important Panel Tests for Montana Roofing Projects
Not every project will prioritize the same performance criteria, but there are a few tests that tend to matter more for metal roofing projects in Montana. Local weather patterns, code requirements, and building use all shape which ratings deserve the closest attention.
Here are some of the main tests to keep on your radar when evaluating a roofing panel:
1. Fire
Fire testing helps determine how a roof assembly performs when exposed to flame and heat. This matters for code compliance, but it also plays an important role in building safety and risk management.
The standards most commonly tied to fire testing are UL 790 and ASTM E108. These tests are used to evaluate roof coverings under external fire exposure and typically support classifications such as Class A, Class B, and Class C, with Class A representing the highest level within that system.
For project engineers, fire ratings are part of confirming that the roof assembly meets the requirements of the structure and occupancy type. It is also important to remember that fire performance is tied to the tested assembly, not just the panel alone. Underlayment, deck type, and the full roof build all influence the final rating, which is why it is important to verify the exact conditions behind the result.
2. Impact
Impact testing looks at how well a panel stands up to sudden force. That can include debris, tools, or other objects that may strike the roof surface during storms or over the life of the building.
The standard most commonly associated with this category is UL 2218, which is used to evaluate the impact resistance of roofing materials. In roofing documents, this is often shown as a class rating, with Class 4 being one of the most recognized benchmarks.
In Montana, impact resistance can be an important factor because roof systems are exposed to demanding weather and changing seasonal conditions. If impact performance is a concern for your project, it is worth reviewing how the panel has been tested and what level of resistance has been documented. It is also worth looking at what kind of impact the rating is meant to address, since not all impacts affect roof systems in the same way.
3. Uplift
Wind uplift is a major consideration for roofing in open and exposed areas, which makes uplift testing one of the most important categories for many Montana projects. This type of testing evaluates how a roof assembly performs under uplift pressures created by wind.
The codes most often tied to this category are UL 580 and UL 1897. UL 580 is used for uplift resistance of roof assemblies, while UL 1897 evaluates uplift resistance for roof covering systems. In many specifications, you may also see classifications such as Class 30, Class 60, or Class 90, which indicate the level of uplift resistance achieved during testing.
For engineers, uplift is often one of the first places to look when evaluating whether a panel system is appropriate for the building location and exposure. Strong winds are a real factor in many parts of Montana, and uplift resistance should never be treated as an afterthought. As with other tests, the result depends on the full tested assembly. The panel profile, fastening approach, clip design, and substrate all play a role.
4. Hail
Hail performance matters for obvious reasons in Montana. A roof can be exposed to sudden storms with little warning, and hail can affect both appearance and long-term function depending on the severity of the event.
Hail performance is often discussed alongside impact resistance, and one of the most common standards tied to it is UL 2218. That is why you may see a panel or roofing product described as Class 4 impact-resistant. In some commercial and insurance-related contexts, you may also run into FM 4473, which is another hail-related reference used for rigid roofing materials.
When reviewing hail-related testing, it helps to distinguish between cosmetic damage and functional damage. Some panels may show visible denting while still maintaining their weather-tight performance. Others may be more vulnerable depending on the panel design, substrate, and tested conditions. If hail is a key concern for your project, that should be part of the discussion early in panel selection, especially when appearance and long-term serviceability both matter.
5. Water Infiltration
A roof system can have strong structural performance and still create major problems if it does not keep water out. Water infiltration testing helps evaluate how well a panel system resists moisture entry under controlled conditions.
The standard most commonly associated with this category is ASTM E1646, which covers water penetration of exterior metal roof panel systems under uniform static air pressure difference. This gives engineers a benchmark for understanding how a panel system handles wind-driven rain and water intrusion under test conditions. In some cases, you may also see ASTM E1680 listed alongside it, which addresses air leakage through exterior metal roof panel systems.
Wind-driven rain, melting snow, and freeze-thaw cycles all make water management especially important in Montana roofing projects. A tested panel system gives you more confidence that the assembly can protect the building envelope when conditions turn rough. As with the other categories, the result is tied to the tested setup, so it is important to review the exact assembly details behind the rating.
Discuss Your Metal Roofing Project with Our Team Today
If you are evaluating panel options for an upcoming project, metal roof panel testing should be part of the conversation from the start. The right panel is not simply the one that fits the design. It is the one that has the right performance data behind it for the conditions it will actually face.
At Great Northern Metal Company, we help project engineers, contractors, and property owners sort through those details so they can choose a panel with confidence. If you have questions about a specific test, need help reviewing product information, or want to talk through which panel makes sense for your project, our team is here to help.
