2 Hr Fire Rated Brick Wall

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.

2 hr fire rated brick wall.

U902 consists of a drainage wall with brick veneer and concrete masonry units and has a 4 hour rating. Use thicker drywall for a two hour rating if double sheeting is not an option with fire resistant insulation between the wall studs. Preferred product 910635 c m u. Thickness provides 1 hour of fire resistance.

8 x 8 x 16 nominal. 3 2 anchored brick veneer anchored brick veneer is defined as brick veneer. For further information on fire resistance of brick see technical notes 16. Adhered brick veneer of 2 combined masonry thickness provides 2 hours of fire resistance.

So although some materials are more fire resistant than others several factors might influence a builder s decision including cost effectiveness ease of installation and climate. 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. The fire resistance rating of multi wythe walls figure 2 is based on the fire resistance of each wythe and the air space between each wythe using the following equation. 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.

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. Figure 1 adhered brick veneer. Cover wood framed walls with a single layer of 3 4 inch type x drywall rated for 120 minutes of fire resistance. A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments.

The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. Portland cement stucco 1 2 thick applied directly to c m u. For multi wythe walls of clay and concrete masonry use the values in table 3 for the brick wythe in the above equation. These fire rated assemblies are found in table 720 1 2 items 15 2 1 and 15 2 2.

Astm c 270 masonry mortar type m or s. Brick still isn t perfect. Depending on the construction and thickness of the wall a brick wall can achieve a 1 hour to 4 hour fire resistance rating. 2 hour fire rating.

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. It is also referred to as a fire rating fire resistance classification or hourly rating.