The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units.
2 hr fire rated brick wall.
As an example a wall with a fire resistance period of 2 hours and 25 minutes may only attain a fire resistance rating of 2 hours.
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.
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.
Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.
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.
Concrete masonry unit.
Use steel studs and two layers of 1 2 inch type c drywall on each side of the studs for a two hour fire rating on an interior wall.
13 mm a 1 in.
A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments.
U902 consists of a drainage wall with brick veneer and concrete masonry units and has a 4 hour rating.
Elements of buildings the fire resistance rating classifies the ability of an assembly to confine and isolate fire within a zone comprised of fire resistance rated walls ceiling and floor assemblies.
Use special fiberglass rated for use in firewalls.
These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.
For example for an 8 in.
The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels.
Mount a 1 1 2 inch fiberglass barrier inside the studs.
Accepts no responsibility for proper application of the rated wall assembly above or responsibility for the construction of such assemblies.
For further information on fire resistance of brick see technical notes 16.
Table 720 1 2 of the international building code item numbers 1 1 1 through 1 2 1 can also be used to determine the minimum equivalent thickness for brick to achieve a fire rating from 1 to 4 hours.
U418 and u425 vary in rating between ã to 2 hours and are brick veneer drainage walls with steel studs and gypsum sheathing and wallboard.
The american society for testing and materials and underwriters laboratory both have specifications for.
203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in.
51 mm thickness can be used.
Figure 2 anchored brick veneer.
These blocks while allowing for safe means of egress and fire rating should no longer be looked at as just normal grey cmu.
