Structural metal panel is the only category of metal roof systems used in low-slope applications. Structural metal panel roof systems can be used for low slope roofs because of their hydrostatic or water barrier characteristics. It is important to note structural metal panel roof systems can also be used for steep slope roof assemblies.

Most structural metal panel roof systems are designed to resist the passage of water at laps and other joints, as sealant or anti-capillary designs can be used in the seams. Structural metal panel roof systems possess strength characteristics that allow them to span supporting members. 

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