Making sense of metal roofing can be tricky because it’s such a broad topic. Metal roofing is used in residential, commercial, and industrial applications with different profiles and gauges of metal to fit each application. In this blog we will look at 6 types of metal roofs being installed so you can learn which type of metal roof is right for your next project.
To begin we will divide the types of metal roofing into two main categories, exposed fasteners and hidden fasteners. Exposed fasteners panels attach to the home or building by running a screw directly through the face of the metal roofing into the wood or metal purling below. A hidden fastener is how standing seam metal roofing is installed. In hidden fastened standing seam roofing the metal is attached to the building via a clip that sits under the metal. In this type of metal roofing the screws are not seen.
Two of the most common types of exposed fastened metal roofing and probably the most sold metal roofing in the United States are a 29 gauge, corrugated metal roofing for agriculture/residential use, and the R panel or PBR panel as its called for the commercial roofing applications especially on pre engineered steel buildings.
R-panel is the exposed fastener panel most commonly used in commercial and industrial roofing applications. R-panel is made of 26 gauge metal and can span open purling 5’ on center like those found in steel buildings. And this is where we most often see the R-panel used, on pre engineer steel buildings.
Exposed fastened metal roofing panels are very common because they are relatively cheap to buy and easy for roofing contractors to install. However, what you save in price you can give up in quality as hidden fastened panels or standing seam metal roofing, when properly installed, will last much longer than an exposed fastener metal roofing.
The next two types of metal roofs we’ll discuss are hidden fastened or standing seam metal roofing. Both panels are considered snap lock because of the way the metal pieces snap together.
26 gauge nail fin is a snap lock metal roofing that is a nice upgrade from a corrugated screw down metal. This panel needs a solid wood deck and works great in residential roofing applications. This panel is considered standing seam, but it does not use a clip, it uses a pre punched nail fin on the side of the metal. The pre punched slots are where the panel is fastened down to the wood decking.
Finally, lets looks at a few types of mechanically seamed metal roofing panels.
A mechanically seamed metal roofing panel is a type of metal roofing that has to be crimped or folded together after the metal roofing is laid. Each panel is crimped, creating a water tight seam between the metal roofing sheets. The major advantage of this type of metal roofing is its ability to be used in low slope applications like steel buildings or on other types of structures where the roof pitch is below a 3 /12. Common mechanically seamed metal roofing profiles include the 2”, 138T, 238T mechanical and the trapezoidal panel. These metal roofing panels are most often found on steel buildings in commercial or industrial applications.
As you may have learned there are many different types of metal roofs, each with a specific use and application. That is really where metal roofing preforms, when the right type of metal roof is used in the right roofing application.