Interior Wall One Hour 1 Hour Fire Rated Wall Assembly

Fire resistance ratings are expressed in the number of minutes or hours a structure can withstand a fire simulation test.

Interior wall one hour 1 hour fire rated wall assembly.

American softwood lumber standard ps 20. According to the engineered wood association a one hour rating indicates that a wall constructed in a manner similar to the one tested will contain flames and high temperatures and support its full load for at least one hour after the fire begins. This ul listed assembly is commonly used in type v multifamily construction in load bearing exterior walls. Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. The fire rating of the wall assembly is the lower of the two. 5 8 15 9 mm toughrock fireguard c gypsum board or 5 8 densarmor plus fireguard c gypsum panels applied perpendicular to resilient channels 24 o c. 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.

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. Table 1 for one hour rated wall assemblies and table 2 for two hour 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. Two layers of 5 8 inch fire rated gypsum on the interior with steel framing or frt wood framing frt plywood exterior sheathing and 5 8 inch exterior fire rated.

610 mm with 1 25 4 mm type s drywall screws 12 305 mm o c. Gypsum panel end joints located midway between continuous channels and attached to additional pieces of channels 54 1372 mm long with screws 12 305 mm. Structural shear rated wall with interior fire exposure rating lp wall assembly for this application has been allowed by building code officials common applications. This assembly is fire rated for 1 hour from both sides.

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. Mount a 1 1 2 inch fiberglass barrier inside the studs. This assembly is fire rated for 1 hour from the interior side only except when brick is the exterior facing. It also allows for the use of fiberglass insulation.