Finish TradesQuestion 273 of 700
An intumescent (fire-resistive) coating is specified on structural steel. It provides its fire protection MAINLY by:
a.Swelling into an insulating char when heated, slowing the steel's temperature rise
b.Reflecting all flame with a mirror finish
c.Adding significant structural strength to the steel
d.Releasing large amounts of water when wet
Explanation
Intumescent coatings expand into a thick insulating char layer when exposed to fire, delaying the temperature rise of the protected steel and preserving its strength longer. They do not work by reflection, do not add structural strength, and do not rely on stored water.
Law Reference: 2025 CA Building Code §716Practice all 700 questions free — no signup required.
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