In terms of spray-applied fireproofing, what does "intumescence" refer to?

Intumescence refers specifically to the expansion of a material when it is exposed to heat. In the context of spray-applied fireproofing, intumescent materials are designed to react to elevated temperatures by swelling and forming a protective char layer. This expanded char layer acts as an insulating barrier, reducing the transfer of heat to the underlying substrate and providing crucial fire resistance.

In fireproofing applications, this characteristic is vital because it helps maintain the structural integrity of building materials, allowing them to withstand elevated temperatures longer during a fire event. Understanding intumescence assists professionals in selecting the appropriate fireproofing systems that can effectively protect structures while also complying with fire safety codes and standards.