1 Hour Fire Rated Wall Construction

Usg provides resources here for our ul wall assemblies for seamless integration into any construction project.

1 hour fire rated wall construction.

If a conventional 1 2 inch thick sheet of drywall will stand up to 30 minutes of fire then the added 1 8 inch found in the type x drywall along with its other properties will double your margin of safety to 60 minutes. This assembly is fire rated for 1 hour from the interior side only except when brick is the exterior facing. Thickness of insulation item 4 is 3 in and two layers of gypsum board panels 1 2 in. The fire resistant rating also requires the rating exposure to be for both sides.

A typical one hour fire rated wall assembly approved by universal laboratories consists of 2 x 4 inch wood wall studs and r 13 glass fiber insulation faced with a vapor retarding foil filling the cavities. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. Use special fiberglass rated for use in firewalls. For occupancies such as stores apartments of fices and other commercial and industrial uses build ing codes commonly require floor ceiling and wall assemblies to be fire resistance rated in accordance with standard fire tests.

Walls less than 5 feet from the property lot line must be of a listed hour fire1 resistant 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. 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. When specified for these 1 hour fire rated assemblies lp flameblock sheathing reduces dead load and wall thickness versus common alternatives.

Type x gypsum board is wallboard to which non combustible fibers have been added. When item 7b steel framing members is used nonbearing wall rating is limited to 1 hr. To the closest interior lot line. For this reason a fire rated drywall is sometimes called one hour fire wallboard.

1 hour fire rated construction non loadbearing acoustical performance reference construction detail description test number stc test number index wt. 7 alternate based on 2 1 2 gauge steel studs and 1 2 face layer laminated ga wp 105153ngc 2318 based on 2 glass fiber. Mount a 1 1 2 inch fiberglass barrier inside the studs. Fire rated wood frame wall and floor ceiling assemblies.

To the centerline of a street an alley or public way. Building code requirements. Where to install type x drywall. To an imaginary line between two buildings on the lot.