When applying SFRM to beams beneath decking, what level of SFRM is placed in the void between beam and deck flutes?

When applying Spray-Applied Fire-Resistive Material (SFRM) to beams that are situated beneath decking, it's essential to ensure that the void between the beam and the deck flutes is properly filled. This filling is critical for several reasons.

First, filling the void contributes to the overall fire-resistive rating of the assembly. An empty void could create a potential weak point, allowing heat to bypass the fireproofing and compromise the integrity of the structural element during a fire. By filling the void with SFRM, the continuity of fire protection is maintained, reducing the risk of structural failure.

Additionally, ensuring that the void is filled helps to prevent any potential thermal bridging, which can occur if air or other materials are present within the void space. This thermal bridging can diminish the effectiveness of the fireproofing materials and lead to uneven heating during a fire event.

Furthermore, filling the void also aligns with industry best practices and often complies with building codes and fire safety regulations, which generally specify that all gaps and voids must be filled unless explicitly stated otherwise. This approach provides a more consistent and reliable method of ensuring adequate fire protection throughout the entire structural assembly.

In summary, filling the void with SFRM unless noted otherwise