What impact does increased mass have on fire resistance?

Increased mass positively affects fire resistance because heavier and denser materials can absorb and dissipate more heat before reaching a critical temperature that would compromise their structural integrity. For example, materials like concrete and masonry, due to their substantial mass, can endure extended exposure to high temperatures without failing. The mass acts as a thermal buffer; it takes longer for heat to penetrate deeply into the material, thereby extending the time before structural failure occurs.

Larger mass also contributes to the overall thermal inertia of a structure. This means that, in the event of a fire, the material can maintain its structural properties and provide additional time for occupants to evacuate and firefighters to manage the situation. Additionally, mass can influence the likelihood of fire spread—heavier materials tend to be less combustible and can suppress flames more effectively compared to lighter, more flammable materials.

In summary, increased mass is associated with enhanced fire resistance, making it an important factor in fire safety and building design.