Interior Wall One Hour 1 Hour Fire Rated Wall Assembly

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.

Interior wall one hour 1 hour fire rated wall assembly.

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. Use special fiberglass rated for use in firewalls. This assembly is fire rated for 1 hour from both sides. Mount a 1 1 2 inch fiberglass barrier inside the studs.

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. 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 fire rating of the wall assembly is the lower of the two. 610 mm with 1 25 4 mm type s drywall screws 12 305 mm o c.

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. Table 1 for one hour rated wall assemblies and table 2 for two hour rated wall assemblies. It also allows for the use of fiberglass insulation. 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.

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project. Fire resistance ratings are expressed in the number of minutes or hours a structure can withstand a fire simulation test. This assembly is fire rated for 1 hour from the interior side only except when brick is the exterior facing. Descriptions of successfully tested i joist floor as.

The ratings relate to fire tests designed to determine how quickly fire can raise the temperature to unacceptable levels. 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. This ul listed assembly is commonly used in type v multifamily construction in load bearing exterior walls.