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.
Ul number for 2 hour wall concrete block.
Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.
These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.
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.
Head of wall firestop system firestop sealant.
Concrete or block wall to concrete over fluted metal deck top of wall max.
13 mm a 1 in.
Ul design u411 v438.
51 mm thickness can be used.
Expanded slag or pumice 4 7 4 5 4 4 4 2 4 0 3 8 3 6 3 4 3 2 3 0 2 7 2 5 2 1 1 9 1 5 a fire resistance rating between the hourly fi re resistance rating periods listed may be determined by linear in terpolation based on the equivalent thickness value of the concrete masonry unit.
Westbrook block is a proud producer of underwriters laboratories ul approved fire rated cmu in both light weight and normal weight densities in 2 3 and 4 hour configurations.
The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units.
These blocks while allowing for safe means of egress and fire rating should no longer be looked at as just normal grey cmu.
Find an appropriate firestop system by searching with the system number or by inputting the application characteristics into the filters.
Head of wall firestop system proform quick set fs 90 compound 1 side ul design u411 v438.
Table 1 required fire wall fire resistance ratings ref.
For example for an 8 in.
203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in.
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.
A 5 1 2 inch wall gets a rating of 2 hours.
For the least fire resistant cast in place concrete that is concrete made with siliceous or what they call group ii aggregates the rating is 4 hours for a cast in place wall 7 1 2 inches thick.
B for group h 1 h 2 or continue reading detailing concrete masonry fire walls.
