Interior 1 Hour Fire Rated Wall Assembly

According to the book commercial drafting and detailing a typical one hour fire rated wall consists of 2x4 studs spaced 16 inches from the center of one stud to the center of the next covered by 5 8 inch type x gypsum board.

Interior 1 hour fire rated wall assembly.

Typically for an exterior wall with a fire separation distance greater than 5 ft 1 524 mm fire needs be considered on the interior side only. The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. This ul listed assembly is commonly used in type v multifamily construction in load bearing exterior walls. This assembly is fire rated for 1 hour from both sides.

It also allows for the use of fiberglass insulation. Descriptions of successfully tested i joist floor as. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Type x gypsum board is wallboard to which non combustible fibers have been added.

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. Two doors each with a fire protection rating of 1 1 2 hours installed on opposite side of the same opening in a fire wall shall be deemed equivalent in fire protection rating to one 3 hour door. Tested lumber wall assemblies are provided in table 1 for one hour fire resistance rated wall assemblies and table 2 for two hour fire resistance rated wall assemblies. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies.

Lumber shall be identified by the grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with the american. Use special fiberglass rated for use in firewalls. Lumber shall be identified by the grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with the. Table 1 for one hour rated wall assemblies and table 2 for two hour rated wall assemblies.

The fire rating of the wall assembly is the lower of the two. Type of assembly required assembly rating hours minimum fire door fire assembly fire. Intertek design lpb wpps 60 01 this intertek listed assembly is commonly used in 1 hour exterior walls along the property line including single family construction. Use steel studs and two layers of 1 2 inch type c drywall on each side of the studs for a two hour fire rating on an interior wall.

For testing requirements see section 715 4 3.