IBC Design 721.1(1) 2-1.2
4-Hour Fire Rated Webs or flanges of steel beams and girders — Siliceous aggregate concrete and concrete excluded in Item…
IBC Table 721.1(1), Item 2-1.2 (Webs or flanges of steel beams and girders): protection by Siliceous aggregate concrete and concrete excluded in Item 2-1.1 with 3" or finer metal mesh placed 1" from the finished surface anchored to the top flange and providing not less than 0.025 square inch of steel area per foot in each direction. Minimum insulating material thickness — 4-hr: 2-1/2" · 3-hr: 2" · 2-hr: 1-1/2" · 1-hr: 1". Prescriptive protection from the adopted building code — see table footnotes for conditions.
Siliceous aggregate concrete and concrete excluded in Item 2-1.1 with 3" or finer metal mesh placed 1" from the finished surface anchored to the top flange and providing not less than 0.025 square inch of steel area per foot in each direction.
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