Are composite sheet board products typically considered intumescent or non-intumescent?

Composite sheet board products are often designed with specific fire-resistive properties, and many of these products are considered intumescent. Intumescent materials expand when exposed to heat, providing an additional layer of protection by filling gaps and reinforcing barriers against fire. This is crucial in maintaining the integrity of fire-rated assemblies. In the context of firestopping, the ability to expand enhances the effectiveness of these materials, allowing them to better seal openings and joints against fire spread.

While some composite products may have non-intumescent characteristics, the question seeks to classify the common understanding of composite sheet board products in the firestop industry. Thus, the designation of 'intumescent' typically applies to those that actively enhance fire resistance through their functional expansion capabilities when subjected to heat. This aligns with standard industry practices where intumescent materials play a vital role in maintaining fire ratings and preventing the passage of flames and hot gases during a fire event.