Which material is permissible for patching SFRM?

Patching Spray-Applied Fire-Resistive Material (SFRM) requires using the same SFRM that was originally applied on the project. This is crucial because different formulations of fireproofing materials can have varying properties in terms of fire resistance, density, adhesion, and overall performance. Maintaining consistency in the materials used ensures that the fire-resistant characteristics and thermal performance of the assembly remain uncompromised over time.

Selecting the same type of SFRM promotes uniformity in the fire protection system, reducing the risk of failure during a fire event and ensuring compliance with safety and building codes. Using different materials for patching, such as gypsum board or concrete mix, could result in a mismatch in performance, potentially compromising structural integrity.