Selecting metal panels based on roof slope

When specifying a metal roof system, choosing the correct panel based on your roof slope is a key factor. Slope, often times referred to as pitch, is the angle of the roof’s surface above the flat plane. Some panels are recommended over others for low and steep sloped roofs.

How to determine the slope

It’s important to know the slope of your roof before choosing a panel. You wouldn’t want to choose a panel that isn’t recommended for your specific measurements. There are many options when choosing a metal roof and this will allow you to narrow down your options.

If you’re unsure of what the slope of a roof structure is, it’s relatively easy to measure. The pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.

Choosing the correct slope

One of the most important aspects of a roof system is making sure it can shed water and making sure the profile doesn’t get overrun with water that has nowhere to drain.

Slope Roof

Lower-sloped systems don’t shed water as quickly as a steep-slope roof. This means that low-slope roofs are more susceptible to leaking due to water backing up or not shedding from the roofing system fast enough, particularly in a rain storm.

Springing a leak is the number one roofing problem that can cause significant damage and lead to high repair costs. That’s why it’s critical to choose a profile where the seam provides the extra weather-tightness required in a lower slope system.

Low slope profiles

Low slope structural roofing, generally used on roof pitches ranging from ¼:12 to 3:12, consists of interlocking panels, commonly called standing seam roofing, that run vertically along the roof surface. A standing seam design assures adequate draining from rain and snow, effectively eliminating ponding, leaks and related problems typically associated with built-up roofs. In retrofit projects, a sub-framing system is attached to the existing flat roof surface to provide a minimum ¼:12 roof pitch.

Steep slope profiles

The most common industry standard for what is considered steep slope is any roofing structure that is above a 3/12 pitch. Unlike low-slope roof systems, steep-slope standing seam metal roofs have more options available to choose from. Since steep slope metal roofs accelerate the rate of water run-off, they also reduce the likelihood of a build-up of debris, mold and mildew. At the same time, they are less likely to experience staining from acid rain or UV degradation than non-metal steep slope systems.

About Metal Sales

Metal Sales Manufacturing Corporation is the premier nationwide provider of metal panels for the construction industry. Metal Sales works with architectural specifiers and commercial construction professionals to create inspirational design solutions. With the industry’s largest and most knowledgeable sales and technical support team, Metal Sales has the expertise to address today’s challenges in high-performance, sustainable and Net-Zero building. Metal Sales has outreach around the world. Delivering outstanding roof, wall and fascia metal panels from its 21 facilities throughout the U.S.

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