IBC Design 721.1(1) 1-2.1
4-Hour Fire Rated Steel columns and all of primary trusses — Clay or shale brick with brick and mortar fill.
IBC Table 721.1(1), Item 1-2.1 (Steel columns and all of primary trusses): protection by Clay or shale brick with brick and mortar fill. Minimum insulating material thickness — 4-hr: 3-3/4" · 1-hr: 2-1/4". Prescriptive protection from the adopted building code — see table footnotes for conditions.
Clay or shale brick with brick and mortar fill.
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- Applicable code sections and test standard
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