What constitutes “over-application” in terms of installed thickness of fireproofing?

The confirmation that applying material thicker than specified constitutes "over-application" is based on the guidelines provided in fireproofing standards and best practices. Fireproofing is designed to provide specific thermal resistance and protective qualities; exceeding the prescribed thickness can lead to several issues.

When fireproofing is over-applied, it doesn't just create a physical burden on the structural elements due to additional weight but can also impact the material's performance characteristics. An excessive thickness can result in cracking, peeling, or other defects that may compromise the integrity of the fireproofing system. Moreover, over-application can interfere with finish applications, potentially leading to aesthetic issues or increased susceptibility to fire in specific conditions.

Maintaining the recommended thickness ensures that the fireproofing material adheres properly, maintains its desired fire-resistive properties, and does not interfere with the building's architectural features or load-bearing capabilities. This understanding is essential for anyone involved in the inspection and application of spray-applied fireproofing, emphasizing adherence to manufacturer specifications and building codes.