What is the maximum allowable relative humidity for the work area when placing TFIFRM?

The maximum allowable relative humidity for the work area when placing thermal insulation fire-resistant materials (TFIFRM) is established to ensure optimal application and performance of the fireproofing materials. When humidity levels are too high, it can adversely affect the adhesion and curing of spray-applied fireproofing products, leading to potential failures in fire resistance performance.

A relative humidity of 75% is typically regarded as the upper limit for many fireproofing applications. This threshold helps to minimize the risk of moisture interference that could cause issues such as surface mold growth or improper bonding to structural substrates. Ensuring that placement occurs within this humidity range is crucial for the integrity of the fireproofing system being installed.

Lower relative humidity levels are generally more conducive to successful application, but maintaining environmental control is key. Therefore, 75% allows a reasonable amount of flexibility while still ensuring that the performance of the fireproofing is not compromised.