2 Hour Fire Rated Wall Thickness

Rockwall fire rated wall panels consist of a unique rockwool mineral fibre core called conrock with laminated sheet steel permanently bonded to both sides.

2 hour fire rated wall thickness.

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. Linear interpolation from table 721 3 2 of the 2007 florida building code. Thickness and composition drywall typically comes in 1 4 inch 3 8 inch and 1 2 inch thicknesses. 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.

203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. It is also referred to as a fire rating fire resistance classification or hourly rating. The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units. 13 mm a 1 in.

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. 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. A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments. In addition to the usual gypsum found in regular drywall fire rated drywall contains glass fibers to form a super tough core.

For example for an 8 in. 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. 51 mm thickness can be used in the joints of a 4 hour wall. 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.

Type x drywall is 5 8 inches thick. This is an alternative code recognized method to the underwriters laboratory ul listing service. Minutes per inches of equivalent thickness. Use thicker drywall for a two hour rating if double sheeting is not an option with fire resistant insulation between the wall studs.

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 ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. 2 hour fire rating.