1 groupfire resistance rating hr a b e h 4 i r 1 r 2 u3a f 1 h 3b h 5 m s 13 h 1 h 24b f 2 s 2 r 3 r 42 a walls shall not be less than 2 hour fire resistance rated where separating buildings of type ii or v construction.

Ul number for 2 hour wall concrete block. 25 mm thickness measured perpendicular to the face of the wall of ceramic fiber in the joint can be used in walls with fire resistance ratings up to 3 hours while a 2 in. 2 h rating based on noncombustible members framed. Assembly rating 2 h load restricted assembly evaluated in accordance with working stress design methods for use under limit states design methods. Concrete blocks of various designs caztc.

203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. For cored units the equivalent wall thickness is calculated by multiplying the percent solid by the wall thickness. Horizontal section bearing or nonbearing wall 1. The equivalent thickness of concrete masonry assemblies.

Allowing for safe means of egress and a higher fire rating these blocks should no longer be looked at as just standard grey cmu. For example for an 8 in. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Refer to information under guide bxuvc.

13 mm a 1 in. 51 mm thickness can be used in the joints of a 4 hour wall. The rated fire resistive periods for block walls can be determined by knowing this information and complying with table 721 1 2 item number 3 of the international building code ibc ref. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

Table 1 required fire wall fire resistance ratings ref. Have a question about assemblies.

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