Interior 1 Hour Fire Rated Wall Assembly

Use special fiberglass rated for use in firewalls.

Interior 1 hour fire rated wall assembly.

This ul listed assembly is commonly used in type v multifamily construction in load bearing exterior walls. 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. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Mount a 1 1 2 inch fiberglass barrier inside the studs.

The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. 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. Type x gypsum board is wallboard to which non combustible fibers have been added. For testing requirements see section 715 4 3.

Fire safety caution passing a fire test in a controlled laboratory setting and or certifying or labeling a product as having a one hour two hour or any other fire resistance or protection rating and therefore as acceptable for use in certain fire rated assemblies systems does not mean that either a particular assembly system. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall 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. It also allows for the use of fiberglass insulation.

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. 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. The fire rating of the wall assembly is the lower of the two. Table 1 for one hour rated wall assemblies and table 2 for two hour rated wall assemblies.

American softwood lumber standard ps 20. 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. 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. Type of assembly required assembly rating hours minimum fire door fire assembly fire.

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.