Certain roof system types historically have been granted
building code waivers from testing to determine their external
fire-resistance classifications. However, changes incorporated into
the International Building Code, 2009 Edition (IBC) alter
these waivers and necessitate fire testing to serve as the basis of
most roof systems' fire-resistance classifications.
If you are involved with roof system manufacturing, sales,
design or installation, I encourage you to be familiar with these
code changes and the specific roof system types the changes
Most building codes divide roof assemblies into three
classifications for the purpose of designating their resistances to
external fire exposure. Class A roof assemblies are effective
against severe fire exposure; Class B roof assemblies are effective
against moderate fire exposure; and Class C roof assemblies are
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