Joints in fire-resistance-rated structures must be protected by what type of system?

In fire-resistance-rated structures, joints play a crucial role in maintaining the integrity of the fire separation. Fire-resistant joint systems are specifically designed to ensure that these joints can withstand the potential spread of fire and smoke between different compartments of a building. These systems help prevent the passage of flames and hot gases, thus maintaining the fire-resistance rating of the structure.

Fire-resistant joint systems provide essential protection by using materials that undergo specific testing to confirm their ability to perform in high-temperature conditions. The designs of these systems take into account the movement and expansion that can occur in buildings, allowing for flexibility while still meeting fire safety standards.

In contrast, non-approved joints lack the necessary certifications and design considerations required for fire safety. Flexible connector systems are typically used for accommodating movement but are not specifically designed for fire resistance. Sound-proofing systems focus on reducing noise rather than ensuring fire protection. Therefore, the appropriate choice for protecting joints in fire-resistance-rated structures is indeed fire-resistant joint systems, which fulfill critical safety requirements in accordance with building codes and fire safety regulations.