What is the minimum fire resistance rating required for fire barrier assemblies in Group U occupancies?

In commercial building codes, particularly those related to fire safety, Group U occupancies typically refer to utility and miscellaneous structures such as barns, sheds, or other similar buildings. The minimum fire resistance rating required for fire barrier assemblies in these types of occupancies is indeed 1 hour.

This rating allows for adequate protection and containment of fire, helping to prevent the spread of flames and smoke in the event of a fire. Fire barrier assemblies with a 1-hour rating are designed to withstand fire exposure for that duration, offering a reasonable level of safety and protection for occupants while allowing for safe evacuation and access for fire fighting efforts.

Higher ratings, such as 2, 3, or 4 hours, might be required for more hazardous occupancies or in more complex structures where the risk of fire spread is greater or where the potential for loss is higher, but for Group U occupancies, the 1-hour rating is generally sufficient according to established codes.