What is the typical density range for SFRM?

The typical density range for Spray-Applied Fire-Resistive Material (SFRM) is generally between 25 and 50 pounds per cubic foot (pcf). This range is important because it reflects the balance needed for effective fire protection while maintaining structural integrity and providing adequate coverage. The density influences not only the fire-resistance rating of the material but also its application properties, such as adhesion, ease of application, and overall performance.

SFRM is engineered to provide sufficient thermal resistance to prevent the propagation of fire and heat, ensuring structural members are protected during a fire event. Within the range of 25 to 50 pcf, SFRM can effectively adhere to various substrates and maintain its performance when exposed to fire, all while ensuring that the additional weight does not impose excessive load on the structure.

Understanding this density range is crucial for inspectors since it affects the material's properties and the overall fire-resistance system's performance. Inspecting to ensure the SFRM is within the correct density range is key to providing the necessary fire protection for buildings.