2 Hr Fire Rated Block Wall

Use thicker drywall for a two hour rating if double sheeting is not an option with fire resistant insulation between the wall studs.

2 hr fire rated block wall.

Portland cement stucco 1 2 thick applied directly to c m u. For example for an 8 in. Walls composed of hollow concrete masonry units having a nominal thickness of 8 inches or greater and having a fire resistance rating of at least 2 hours shall be classified as 4 hours when the hollow spaces are completely filled with perlite or vermiculite grout or a material such as expanded slag clay shale slate or sand. The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units.

Cover wood framed walls with a single layer of 3 4 inch type x drywall rated for 120 minutes of fire resistance. 51 mm thickness can be used. Astm c 270 masonry mortar type m or s. 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.

V337 2 hour interior wall assembly ul design no. U350 1 hour exterior wall assembly ul design no. Concrete masonry unit equivalent t hickness. 2 hour exterior wall assembly ul design no.

A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments. 8 x 8 x 16 nominal. 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. 203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in.

2 hour fire rating. 13 mm a 1 in. 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. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.

It is also referred to as a fire rating fire resistance classification or hourly rating. Preferred product 910635 c m u. 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. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

Lp flameblock fire rated osb sheathing is a component of the following code compliant fire rated assemblies. 2 52 3 80 4 78 5 60 e figure 1. E 0 53 7 625 4 04 in. These blocks while allowing for safe means of egress and fire rating should no longer be looked at as just normal grey cmu.

Face shell or full mortar bedding as.