Guides to Metal Roof Minimum Slope in Corrugated and Standing Seam Profiles

Regardless of your building’s purpose, determining the minimum slope of the metal roof is crucial if you opt for this material. There are many benefits when it comes to metal material for roofing.

You might already know of it, such as providing durability, longevity, and water-shedding. The visual aspect is also one of the reasons that many people choose this exact material.

See Also : Metal Roofing Pros and Cons That You Should Know

When installing a metal roof panel, one of the key considerations is the roof’s pitch. This aspect is influenced by various factors, including the roof profile, site location, building design, and climate.

Below you’ll find the specifications for the minimum slopes of the metal roof that will guide you before installing one.

Minimum Roof Pitch for Metal Building

Among many decisions one has to make when designing a metal building, determining the minimum metal roof slope is crucial. Roof pitch is the building’s roof slope; it determines how many inches the roof should rise for every 12 inches expanding on the horizontal side.

Some people prefer high pitches and others choose low roof pitches – each has advantages and disadvantages.

Minimum Roof Pitch for Metal Building

However, it is widely agreed that a lower roof pitch is more cost-effective than the other. The reason is they require less material, so the cost required is on the cheaper side. Lower pitch also decreases the total cubic sizes. Therefore it is easier to cool down or heat the building.

It is less visible, so the owner has little to no reason to spend money on colored panels. In conclusion, unless you desire higher clearance of your building’s interior or a particular exterior aesthetic.

As per international building codes, the minimum slope for a metal roof often follows a 3:12 ratio, meaning the roof must rise 3 inches vertically for every 12 inches it extends horizontally. For specific types of roofs, such as standing seam metal roofs, the minimum slope can be as low as 1/4:12.

The standard of lower pitch ranges between 1:12 and 5:12. Anything above will require you to put out higher costs because they are already considered higher.

Minimum Pitch for Corrugated Metal Roof

Corrugated roofing is an amazing choice for conventional pitched roofs despite having severe pitch limitations. The minimum slope of the corrugated metal roof is 5 degrees. It is the recommended slope as there is no guarantee that you will opt for a flatter pitch than this.

This is crucial to ensure water runoff, especially in areas prone to heavy rain or snow. Lapped non-soldered seam metal roofs require a minimum slope to ensure that water does not penetrate the lapped seams, which can be sealed with an applied lap sealant for additional protection.

See Also : Corrugated Aluminum Panels

Minimum Pitch for Corrugated Metal Roof

Most buildings with metal roofing systems are using corrugated roofing types. It is the most used metal roof profile worldwide, traced even back to 1820. Here are a few benefits of this roofing profile:


Getting leaks when using the roofing shingles system is a common complaint. Properly installing corrugated roofing will prevent you from getting this issue and keep your building dry. The waterproof quality can even be enhanced by using coatings such as epoxy or ceramic.

Long durability

Although lightweight, corrugated metal roofs have ridges and grooves that contribute to their long-lasting life. They are not prone to corrosion, which guarantees durability for the owner. It also has non-combustible properties that make it fireproof. It can also withstand extreme weather or climate conditions.

Easy to install

As mentioned in the prior point, a corrugated metal roof is lightweight, so naturally, it doesn’t need much material for structural support. The installation effort is automatically reduced, and more energy can be spent on the effective customization plan.

Importance of Proper Installation

Proper installation is essential to ensure that the minimum slope for metal roofs functions effectively. This process includes accurately measuring the roof’s dimensions, calculating the total area, and ensuring that each panel is installed correctly. Incorrect installation can lead to problems such as water pooling and leaks.

Minimum Pitch Metal Roof Snow

When properly designed and installed, the metal roofing system is famous for its strong performance against harsh climate environments. Several other factors add to this quality, such as proper slope, snow loading requirements, or snow guard usage.

The standard practice is to have higher roof pitches where it snows, storms, or rains heavily, compared to the places with fewer snows and rains.

Minimum Pitch Metal Roof Snow

In the country, with heavy snow and tough winter days, the minimum slope of the metal roof is recommended to be 1:12.

Some opinions stand that the minimum slope of the seam metal roof is ¼:12, but it increases the possibility of leaking on the first few days of snow arrival.  

Standing seam is the metal roof profile gaining more popularity nowadays due to its clean and modern looks. These panel systems can be identified as straight and sleek lines. It also comes in any color to suit any building’s structure.

Researching, paying attention, and following common standards are the keys to reap the maximum benefits of using a metal panel for your roofing system.

Compliance with Building Codes

Adhering to building codes is essential when installing metal roofs. These codes dictate the minimum slope for standing seam metal roofs and other types, ensuring the roof is safe and functional. It’s important to consult a roofing professional to ensure your roof meets these standards.

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RoofLast is an experienced author and roofing expert. With years of practical experience in the field authored several informative articles on various aspects of roofing, including installation, maintenance, and repair