When is the best time to perform thickness testing on SFRM?

Performing thickness testing on Spray-Applied Fire-Resistive Material (SFRM) is best conducted after a curing period. This timing is crucial because it ensures that the material has had the opportunity to properly set and achieve its intended physical and fire-resistive properties. Right after application, the SFRM may still be undergoing evaporation and bonding processes, which could lead to inaccurate measurements of thickness and performance characteristics.

Additionally, conducting the thickness test too soon may overlook potential variances that could occur as the material dries and cures. Waiting until after the curing period allows for a more reliable assessment of the final thickness, ensuring it adheres to structural fire protection requirements and codes. Conducting the test before application would also be inappropriate, as there would be no material to measure. Testing after moisture exposure could yield unreliable results due to potential damage or degradation of the material, further emphasizing the importance of testing only once the SFRM is fully cured.