Changes to the latest editions of the model building codes have
removed exemptions from fire testing for certain roof assemblies
that previously were granted fire classifications without testing.
If you are involved in the manufacturing, design, specification or
installation of architectural metal panel, metal shingle, tile or
slate roof systems, you should be aware of these revisions and the
effects they may have on roof assembly designs.
The model building codes and most jurisdictions' codes
historically have exempted certain roof covering types from fire
testing and granted them fire classifications without testing. For
example, the International Building Code,® 2006 Edition
considered roof coverings of brick, masonry, slate, clay or
concrete roof tile, exposed concrete decks, and ferrous or copper
shingles or sheets to be Class A without fire testing. Similarly,
roof coverings of other (nonferrous or copper) metal sheets and
shingles were considered Class B without fire testing. At the time,
the codes granted these roof coverings exemptions because they were
thought to be inherently fire-resistant.
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