What is a common cause of insufficient thickness during a spray-applied fireproofing application?

Inadequate thickness in spray-applied fireproofing often stems from inconsistent spray technique or equipment malfunction. The application of fireproofing material requires precise control over the spray gun and the characteristics of the material itself, such as viscosity and density. If the applicator does not maintain a consistent distance from the surface, or if the spray pattern is irregular due to equipment issues, this can result in uneven coverage and insufficient material thickness.

Furthermore, equipment malfunctions, such as improper pressure settings or clogged spray nozzles, can impede the proper delivery of the fireproofing material. Both of these factors directly influence how effectively the material adheres and coats the substrate, which is critical for achieving the required fire resistance rating.

While training and the type of material used can contribute to the outcome, the immediate impact of spray technique and equipment performance is paramount. The time of day typically does not affect the application process unless environmental conditions, such as temperature or humidity, are significantly altered, which is less directly associated with insufficient thickness.