2 Hour Fire Rated Wall Thickness

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.

2 hour fire rated wall thickness.

Cover wood framed walls with a single layer of 3 4 inch type x drywall rated for 120 minutes of fire resistance. Type x drywall is 5 8 inches thick. The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units. In addition to the usual gypsum found in regular drywall fire rated drywall contains glass fibers to form a super tough core.

Once rockwall panels have been installed according to the specific intertek warnock hersey certification guidelines the assembly provides 1 2 and 3 hours of fire resistance with a 4 5 and 6 core thickness respectively. For a wall having no finish on one side or different types or thicknesses of finish on each side the calculation procedures of sections 722 2 1 4 1 and 722 2 1 4 2 shall be performed twice assuming either side of the wall to be the fire exposed side. 2 hour fire rating. Minutes per inches of equivalent thickness.

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 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 building code ibc ref. Rockwall fire rated wall panels consist of a unique rockwool mineral fibre core called conrock with laminated sheet steel permanently bonded to both sides. 13 mm a 1 in.

The fire resistance rating of the wall shall not exceed the lower of the two values. 51 mm thickness can be used in the joints of a 4 hour wall. 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.

Accepts no responsibility for proper application of the rated wall assembly above or responsibility for the construction of such assemblies. 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. This is an alternative code recognized method to the underwriters laboratory ul listing service. It is also referred to as a fire rating fire resistance classification or hourly rating.

203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. Thickness and composition drywall typically comes in 1 4 inch 3 8 inch and 1 2 inch thicknesses. Linear interpolation from table 721 3 2 of the 2007 florida building code.