We can classify the panels in different forms: for their structural performance, type of fasteners, watertightness performance, type of profile, etc...
At the end you need to evaluate which characteristics are more important to you, you can have a structural rated panel but with exposed fasteners, that is the case of the so called Commercial and Agricultural profiles, they give the structural strength but since they are attached to the structure with exposed fasteners the warranty of not having water leaks is for 3 up to 5 years, that means their watertight warranty is non.
You can have structural rated panels that meet the watertight warranty but in certain slope ranges, the most common slopes that are used in this kind of panels goes from 1/2:12 up to 12:12.
The Mechanical lock panels are the best option if you are looking for structural, aesthetics, and slope range from 1/2:12 up. they have the best watertightness performance, specially if you install them with a non skinny caulk bead at the female rib and perform a double seam pass with an electrical seamer at the end of the installation. This system can be warranty up to 35 years.
We also have the Snap Lock type panels, they have concealed fasteners, may have or not clips, may come with a bead of caulk at the female rib, but they are not mechanically seamed, you just need to push the female rib against the male and they will snap to each other.
As you can see, the metal panel industry have a wide range of profiles, textures, finishes, and performances for all kind of building, the secret is how to choose the one that will give the best performance and fulfill your needs 100%
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