When is Steel Fireproofing Required? Commercial construction structural steel columns must meet at least the X106, or 2-hour, fire-resistance rating, among other requirements. The most common fire-resistance ratings are 2-, 3-, and 4-hour ratings.

Why fireproofing is required?

Typically fireproofing materials are specified for either cellulosic (ordinary) or hydrocarbon fire exposures at various durations. The essential feature of fireproofing is that it does not allow the passage of flame or heat and therefore can protect against structural collapse for certain conditions.

Does all steel need fireproofing?

Structural steel melts at approximately 2,500°F, while building fires commonly reach a temperature in the range of 2,000°F. The possibility of melting steel is rare, but this does not mean that steel structures are safe. ... Building codes require fireproofing protection for structural steel as a safety precaution.