How Thick Are Fire Rated Concrete Walls

Balanced design building codes equivalent thickness fire fire resistance period fire resistance rating fire test.

How thick are fire rated concrete walls. A2 2 framed and composite construction non load bearing 1. For example for an 8 in. 203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units.

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. A 5 1 2 inch wall gets a rating of 2 hours. The equivalent thickness of solid walls and slabs with flat surfaces is the actual. The fire resistance rating of reinforced and plain concrete walls floors and roofs depend on equivalent thickness of the element and can be found out using table 3.

For untested wall assemblies procedures are presented for calculating a fire resistance rating. 13 mm a 1 in. 51 mm thickness can be used. 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.

Steel frame with external cladding of 16mm rendering on metal lathing and internal lining of autoclaved aerated concrete blocks density 480 1120 kg m 3 of thickness of a 50mm. Fire resistance of concrete is the ability of concrete to withstand fire or to give protection against fire. 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. The duration of time that an element such as beam column wall floor or roof can endure.

The corrected thickness of finish shall then be added to the actual or equivalent thickness of concrete and fire resistance rating of the concrete and finish determined from tables 722 2 1 1 and 722 2 1 2 1 and figure 722 2 1 2. Period of fire resistance. Fire resistance ratings of several brick masonry wall assemblies tested using astm e119 procedures are listed. This involves the ability of concrete structural element to continue perform a specific structural function or confine fire or both.