Table of Contents
Spend ten minutes on any metal building website and you will walk away with a list of specs you may not fully understand. Vertical roof. 14-gauge. 160 MPH certified. They sound important, and they are. But nobody stops to explain what they actually mean in the real world, for a real piece of property, in real weather.
We get calls about this constantly. Someone will be comparing two quotes and one mentions a vertical roof and the other does not, and they want to know if that is actually worth the difference. Or a farmer in Oklahoma needs a permit for a new equipment shelter and the county is asking for engineer-certified drawings, and he has no idea what that even requires from a building standpoint.
This post is for those people. We are going to go through all three specs, plain and direct, so you know what you are buying and why it matters before you sign anything.
Most buyers come in thinking the roof style is about aesthetics. Pick the one that looks right, move on. The truth is the roof panel orientation is one of the most performance-critical decisions on the whole building, and it affects how your structure holds up every single season.
On a standard horizontal roof, the metal panels run left to right across the slope. The ridges in those panels are horizontal too, running parallel to the ground. In mild climates with light rain and no snow, that works well enough. But those horizontal ridges are natural collection points. Leaves, pine needles, standing water after a storm, and in colder climates, snow that does not fully shed. Trapped moisture is where rust starts. It is where seams begin to weep. It is a slow problem that becomes an expensive one.
A vertical roof flips the entire logic. The panels run ridge to eave, top to bottom, so every ridge line points straight down. Rain runs off clean. Snow slides before it can pile and load the roof. Debris has nowhere to catch. The roof drains the way a sloped surface is supposed to drain.
Beyond drainage, there is structure. Vertical roof buildings get what are called hat channel braces, horizontal metal channels that run across the inside of the roof frame perpendicular to the panels. They create a secondary connection grid between the panels and the structural frame. That gives the roof more rigidity under wind uplift and lateral load, which is why nearly every engineer-certified metal building design calls for a vertical roof. It is not just cleaner. It performs better structurally.
Buyers in the Gulf states, the Carolinas, the Mountain West, the upper Midwest, basically anywhere that sees real weather, should be ordering a vertical roof. It is not a luxury spec. For those climates, it is the right spec. If you are somewhere mild and you are on the fence, call us at (800) 691-5221. We can tell you honestly whether the upgrade makes sense for your location or whether a standard roof will serve you fine. You can also Design Your Building to compare your options.
Steel gauge works the opposite of how most people expect. A bigger number is actually thinner, lighter steel. A smaller number is thicker and heavier. So 16-gauge is lighter than 14-gauge, and 14-gauge is lighter than 12-gauge. When someone tells you a building uses 14-gauge framing, they are telling you the structural tubing, the columns, the base rails, the main frame, is built from steel that hits a specific thickness on that scale.
Why does that matter? Because the frame is what your building’s entire performance rests on. The panels shed weather. The frame holds everything up.
Two metal buildings can share the same footprint, the same roof color, even the same door layout, and perform completely differently under load because the frames are built to different specs. A 14-gauge frame resists racking from wind pressure better than a lighter one. It carries roof load, including snow accumulation, without the micro-flexing that loosens connections over time. On joints and base plates especially, gauge shows up in longevity. Heavier steel at connection points just holds longer.
The gap between 14 and 16 gauge becomes more obvious the wider your building gets. A single-car carport at 12 feet wide does not stress a lighter frame much. Pull that same roof out to a 24-foot or 30-foot span for an RV cover or a pole barn, and now every column and base rail is carrying a meaningfully larger load. That is where gauge stops being a spec on paper and becomes something you can see in how the building performs after ten winters.
For most homeowners, farmers, and contractors building carports, garages, workshops, and animal shelters, 14-gauge framing is solid and appropriate. It handles the load demands of residential and light agricultural use very well.
There are situations where 12-gauge is the right call. Wider commercial spans. Buildings designed for unusually heavy equipment with high point loads on the floor. Projects where a structural engineer has reviewed the design and come back with a higher gauge spec. If you are in that category, ask us about it directly. We offer 12-gauge options and we will tell you straight whether your project actually needs it or not.
A wind rating is not a sticker a manufacturer puts on a building to make it sound tough. A certified 160 MPH wind rating comes from a licensed structural engineer who has reviewed the frame design, the gauge specs, the anchoring system, and the roof configuration, run the load calculations, and signed their name to a set of stamped drawings confirming the structure can perform at that speed under specific design conditions.
Those drawings are what counties and permit offices want to see. Not a brochure. Stamped engineering documents.
Engineers use wind speed maps and hazard tools developed around ASCE standards to identify the design wind speed for a given location. Your county sits in a wind zone, and that zone has a minimum design speed the building has to meet for permit approval. The engineer takes your building’s dimensions, its gauge, its anchoring system, its roof style, and runs them against that wind speed requirement. If the design holds at the rated speed, they stamp it. You can check location-specific hazard data through the ASCE Hazard Tool.
That process is why you cannot swap specs after the fact on a certified building. Change the gauge and the stamped numbers no longer apply. Change the roof style and the uplift calculations change. The certification is for the building as designed, and every piece of it matters.
Depends entirely on where you are building. Coastal Florida, coastal Texas, the Outer Banks, Gulf Coast Louisiana, and several parts of the Great Plains all sit in high wind zones where 160 MPH design speed is common or required. Plenty of inland counties are in lower wind zones where a 115 MPH or 130 MPH certification satisfies the permit office.
What we tell customers who ask is this: find out what your county requires before you choose your building, not after. We can help you think through it, but your local building department has the actual answer for your parcel. Call them, ask what the required design wind speed is for a structure of your type and size, and then call us back. We will make sure the building you order is certified to what you need.
One more thing worth knowing. Even in counties that do not require a certified wind rating, buying a 160 MPH rated building means you have a building whose performance has been verified by an engineer. You are not guessing. That matters to some buyers and it is a completely reasonable reason to order the upgrade even without a permit requirement driving it.
A certified wind rating applies to a building that was installed correctly on a properly prepared site. If the ground was not level when we arrived. If the anchor bolts in a concrete slab were not set at the right depth. If the grading around the foundation drains poorly and allows frost heave to shift the base plates. All of those things affect how the building actually performs, regardless of what the engineer’s stamp says.
That is one of the reasons Delivered and Installed matters. When we show up and build it, the installation is done to the standard the engineering requires. If you are managing your own install crew or working with a third party, make sure they are following the stamped drawings, not cutting corners on anchoring. For more on storm performance, see how to ensure your carport withstands high winds.
Here is something a lot of buyers do not realize until they get into the engineering side of a certified build. Vertical roof, 14-gauge framing, and a 160 MPH wind rating do not exist independently of each other on a certified building. They are calculated together.
An engineer signing off on a 160 MPH certified metal building needs to know the roof panel orientation, because roof uplift under wind load is calculated differently for a vertical panel run versus a horizontal one. They need the gauge spec because the column capacities and connection strengths in the structural math depend on the actual wall thickness of the tubing. You cannot tell an engineer you want a 160 MPH certified building and then swap to a lighter gauge or a horizontal roof and expect the stamp to still be valid. It is not.
So for buyers in high-wind zones who need permitted, certified structures, the conversation is simpler than it seems. You are getting a vertical roof and 14-gauge framing because those are part of what makes the certification possible. They are already bundled into what an engineered build looks like.
For buyers who are not in a high-wind zone and do not need a permit, each spec still offers its own standalone value. A vertical roof in a snowy climate pays for itself in the first hard winter by not collecting weight on the roof. A 14-gauge frame on a wide building holds its shape over decades in a way a lighter gauge frame does not. You do not have to need the full certified package to benefit from the individual upgrades.
Before you finalize your building design, run through this honestly. If you are building near the coast, anywhere in Florida, along the Gulf, in the Carolinas, or in a high-plains area with documented severe wind history, bring up certification in your first conversation with us. If your county has already told you they want stamped drawings, do not order without getting that sorted first. If your building is going to be wider than 20 feet and you plan to use it seriously year round, ask about 14-gauge framing. And if you live somewhere that gets real snow, a vertical roof is not an upgrade. It is just the right call.
If you are in a mild climate putting up a modest-sized structure for covered parking or light storage, you may not need any of these. Standard configurations do the job for millions of buyers every year. What matters is matching the building to what your property actually needs, not loading it with specs you will never use. If you need help comparing sizes, roof styles, and use cases, our Building Guide is a good place to start.
What is the difference between a vertical roof and a regular roof on a metal building?
On a vertical roof, the metal panels run from the ridge at the top straight down to the eave, so water and snow drain off naturally. A standard horizontal roof has panels running side to side, which creates horizontal ridges where moisture and debris can collect over time. Beyond drainage, vertical roofs include hat channel bracing that adds structural rigidity, which is why they are required on engineer-certified builds.
Is 14-gauge steel stronger than 16-gauge for a metal building?
Yes, and the reason people get confused is that lower gauge numbers mean thicker steel, not thinner. A 14-gauge structural tube is heavier and stiffer than a 16-gauge tube of the same dimensions. That difference is most noticeable on wider buildings where the frame is carrying more span load, and at joints and base connections where heavier steel holds up better over years of use.
Do I need a 160 MPH engineer-certified wind rating for my metal building?
That depends on your county’s requirements and your wind zone. Coastal areas in the Southeast, Gulf states, and parts of the Great Plains are commonly in zones where 160 MPH design speed is required for permitted structures. Your local building department can tell you exactly what design wind speed applies to your parcel. We can help you match your building to that spec once you know what it is.
Does a 160 MPH wind rating mean my building is hurricane-proof?
Not exactly. A wind rating is an engineered performance standard for a properly installed building under the conditions defined in the stamped drawings. It is not a blanket guarantee for every storm scenario. What it does mean is that the building was designed and verified by a licensed engineer to meet that speed, which is a significantly higher standard than a building with no certification at all.
Can I get a vertical roof on any Get Carports building?
Yes. Vertical roof is available across our carports, garages, barns, and RV covers. You can set it up through our Design Your Building tool or just call us at (800) 691-5221 and we will walk through the configuration with you.
What is hat channel bracing and why does it show up on vertical roof buildings?
Hat channel is a horizontal metal brace that runs across the inside of the roof frame, connecting the vertical panels to the structural frame beneath them. It stiffens the roof system and improves how the building handles wind uplift. Standard horizontal roof buildings do not have it, which is one of the structural reasons vertical roofs perform better in high-wind and high-snow environments, and why engineers require them on certified designs.
Vertical roof is about drainage and structure, not style. 14-gauge steel is about frame strength and long-term performance under real load. A 160 MPH wind rating is an engineer’s certification that the building, as designed and installed, meets a verified wind speed standard. On a certified build, all three work together because they are designed together.
If you need a permitted, engineer-certified metal building, start that conversation early. If you are building in a tough climate without a permit requirement, the vertical roof and 14-gauge framing still make practical sense depending on your use case. And if you are somewhere mild putting up a straightforward structure, we will tell you that too. We are not here to sell you specs you do not need.
Design your building at Get Carports or call us at (800) 691-5221. We will ask you the right questions and help you put together something that actually fits your property, your climate, and your budget. You can also review our warranty information before you order.
California agriculture does not run on one schedule, one crop, or one type of operation.…Read More
If you are shopping for metal buildings in Arkansas, you need more than a rough…Read More
Permits in Florida Getting a metal carport approved in Florida isn’t just a quick form…Read More
Please fill out the form below to get a quote for your metal building.