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AMSI Blog

Choosing a Metal Roofing Type

All metal roofs are not created equally. There are different types of metal roofs to meet different performance needs. So how should you go about choosing a metal roof? Here are a few things to consider.

Snap Together Trapezoidal Panels

When it comes to channeling water off of the roof, the trapezoidal shape is among the best. Because of this shape, however, it is the best with typical sloped roofs that have single plane roof areas that are free of hips or valleys. With the snap together installation, it is quick and easy to install economically with wind-resistant capabilities that are adequate for many situations.

Mechanically Seamed Trapezoidal Panels

If the roof needs a higher degree of performance than a snap together system can provide, mechanically seamed trapezoidal panels can be considered. You can get higher degrees of wind and water resistance with the mechanically field-seamed, trapezoidal legs. For this reason, they are the ideal fit for a number of architectural, commercial, and industrial roofs without valleys and hips that can be subject to increased rain and wind demands.

Vertical Legs with Mechanical Seams

If the trapezoidal legs aren’t going to work, the vertical leg standing seam metal panels are the best choice. In these systems, tall legs are mechanically field-seamed once along each panel joint in order to create a standing seam roof system that is high in strength and structurally. It can be installed over bar joists or purlins directly. It won’t require any additional solid substrate. In addition, it’s capable of transitioning from roof to fascia using accessory seam covers.

Double Seamed Vertical Legs

The highest degree of roof performance is provided by double seamed vertical legs. These roof panels are basically the same as the single seamed vertical legs, but the profile is adjusted slightly so that standing seams can be rolled over twice. This creates a stronger, thicker seal between adjacent panels. There is not a difference in the cost of the materials, but there will be a higher labor cost due to the field seaming step. But when it comes to the higher performance and added peace of mind, it can be well worth it.

There are some major differences between these four types of metal roofs. However, they all have similarities as well. For example, they all make use of high-grade steel in standard gauge thicknesses, and they can also all be specified in the same wide choice of colors. They are also available in multiple panel widths.