Metal roof systems often are misunderstood, especially by
building owners and consumers. For instance, many building owners
are unaware that there actually are two types of metal panel roof
systems. Also, building owners may not realize metal roof systems
are not limited to steep slopes—they can be installed for
low-slope applications, as well. But once a building owner chooses
to install a metal roof system, he must be well-informed about the
special design considerations that are unique to metal roofing.
Metal roof systems traditionally are divided into two
categories: architectural and structural.
Architectural metal panel roof systems typically are
hydrokinetic, water-shedding systems. These systems are designed to
shed water rapidly over panels' surfaces, so the panels' seams are
not necessarily watertight. For panels to shed water quickly, a
roof must have adequate slope. NRCA recommends a roof slope of
3-in-12 (14 degrees) or greater for architectural...
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