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. The equivalent thickness of concrete masonry assemblies. A 2 hour rating can be achieved by a wall with an equivalent thickness of as little as 3 1 5 inches when expanded slag or pumice is used or 4 1 2 inches when siliceous gravel is used as the aggregate. Table 1 required fire wall fire resistance ratings ref. Concrete blocks of various designs caztc.

Refer to information under guide bxuvc. 2 h rating based on noncombustible members framed. For example for an 8 in. This is an alternative code recognized method to the underwriters laboratory ul listing service.

Assembly rating 2 h load restricted assembly evaluated in accordance with working stress design methods for use under limit states design methods. Have a question about assemblies. Westbrook block is a proud producer of underwriters laboratories ul approved fire rated cmu both light weight and normal weight densities in 2 3 and 4 hour configurations. 13 mm a 1 in.

Horizontal section bearing or nonbearing wall 1. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. 51 mm thickness can be used in the joints of a 4 hour wall. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

Allowing for safe means of egress and a higher fire rating these blocks should no longer be looked at as just standard grey cmu. 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.

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