2 Hour Fire Rated Wall Thickness

In addition to the usual gypsum found in regular drywall fire rated drywall contains glass fibers to form a super tough core.

2 hour fire rated wall thickness.

It is also referred to as a fire rating fire resistance classification or hourly rating. This is an alternative code recognized method to the underwriters laboratory ul listing service. 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. The fire resistance rating of the wall shall not exceed the lower of the two values.

A fire resistance rating is based on a fire resistance period and usually given in half hour or hourly increments. 2 hour fire rating. Use thicker drywall for a two hour rating if double sheeting is not an option with fire resistant insulation between the wall studs. Minutes per inches of equivalent thickness.

Cover wood framed walls with a single layer of 3 4 inch type x drywall rated for 120 minutes of fire resistance. Thickness and composition drywall typically comes in 1 4 inch 3 8 inch and 1 2 inch thicknesses. 203 mm limestone aggregate concrete masonry wall with a maximum control joint width of in. 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.

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. Accepts no responsibility for proper application of the rated wall assembly above or responsibility for the construction of such assemblies. Type x drywall is 5 8 inches thick.

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

The fire resistance rating of concrete masonry walls depends on the type of aggregate used in the units. 51 mm thickness can be used in the joints of a 4 hour wall. 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.