When measuring tube steel SFRM thickness, what must be ensured regarding specified thickness?

When measuring the thickness of spray-applied fire-resistive materials (SFRM) on tube steel, it is essential to ensure that none of the measurements fall below the specified thickness. The purpose of SFRM is to provide adequate fire resistance, which is crucial for the safety and structural integrity of a building in the event of a fire.

If any measurement is less than the specified thickness, it can compromise the effectiveness of the fireproofing, potentially leading to failure in achieving the required fire rating. Thus, compliance with the specified thickness is critical, as it assures that the materials will perform as intended during a fire scenario.

Other options, such as exceeding the specified thickness or averaging measurements, do not ensure that all points meet the minimum requirements set for fire resistance. It is imperative to focus on the minimum threshold, as any deficiency could lead to severe safety hazards.