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

Filling the void between the beam and the deck flutes when applying Spray-Applied Fire-Resistive Material (SFRM) is critical for achieving the intended fire-resistance performance. Proper filling ensures that thermal insulation is uniform across the structural elements, which prevents weaknesses in fire protection that could arise from having unprotected areas.

By filling the void completely, SFRM helps to prevent the transfer of heat to the underlying beams. This is essential for maintaining the structural integrity of the beams during a fire. If the void were to be left empty, there could be a significant risk of the beams overheating, leading to potential structural failure.

Choosing to fill the void unless noted otherwise also indicates adherence to best practices in fireproofing. It reflects an understanding that in most structural applications, comprehensive coverage is necessary to ensure that the fire-resistive barrier is effective. Specific structural designs may allow for exceptions, but unless otherwise specified, the standard approach is to fill the void for optimal fire protection.

This approach aligns with industry standards and guidelines in fireproofing, helping ensure compliance with building codes and enhancing overall safety. Thus, filling the void is a crucial step in the application of SFRM that ensures not only fire safety but also long