Which term describes steel beams that are covered with spray-on fireproofing or fully encased in a UL-designed system?

Which term describes steel beams that are covered with spray-on fireproofing or fully encased in a UL-designed system?

• A. Fire-Stop
• B. Oriented Strand Board (OSB)
• C. Fire Load
• D. Protected Steel

Answer: (D)

Structural steel that is covered with spray-on fireproofing or encased in a UL-listed fire-protection system is described as protected steel. The coating or encasement acts as a barrier to heat, slowing heat transfer into the steel so its strength is preserved long enough to meet the required fire-resistance rating for the building. This is different from unprotected steel, which relies on lack of coverage, or on other fire-control elements. Fire-stop refers to barriers preventing fire spread through openings, OSB is a wood sheathing panel, and fire load is the amount of combustible material in a space—all unrelated to describing steel that has protective fireproofing.

Structural steel that is covered with spray-on fireproofing or encased in a UL-listed fire-protection system is described as protected steel. The coating or encasement acts as a barrier to heat, slowing heat transfer into the steel so its strength is preserved long enough to meet the required fire-resistance rating for the building. This is different from unprotected steel, which relies on lack of coverage, or on other fire-control elements. Fire-stop refers to barriers preventing fire spread through openings, OSB is a wood sheathing panel, and fire load is the amount of combustible material in a space—all unrelated to describing steel that has protective fireproofing.