Use of “L” Type Partition Intersections in Fire-Rated Assemblies

This research report evaluates the use of L-shaped partition intersections as an equivalent alternative to the Ushaped intersections typically shown in fire-resistive assembly evaluation reports. Performance of L-shaped wall intersections is evaluated as a component of maximum one-hour-rated wall assemblies. The UL356 assembly is used as an example. Use of the L-shaped partition wall intersection is permitted for other fire-resistant rated wall assemblies provided the construction meets the requirements of IBC Section 722 for calculating the fire resistance of wall assemblies with a maximum fire-resistance rating of one hour.