2 Hour Fire Rated Wall Construction

Mount a 1 1 2 inch fiberglass barrier inside the studs.

2 hour fire rated wall 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. An increasingly common and popular method is the gypsum area separation wall which consists of individual stud framed walls filled with fiberglass insulation for each housing unit which are separated by a special construction that consists of. 50 8 mm light gauge steel h studs that secure two layers of 1 in. Descriptions of successfully tested i joist floor as.

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. As applied to 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. All other building classes including. Gyprock has developed a broad range of fire rated systems to help specifiers and builders meet the bca requirements with confidence.

The 2 hour area separation wall system is a 2 hour fire wall consisting of 2 in. These wall assembly files are used for planning and estimation purposes for many ul wall types such as fire rated wall assemblies. 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.

There are many ways to meet the requirements for 2 hour fire rated separation walls including foundation to roof masonry walls separating the units. For this reason a fire rated drywall is sometimes called one hour fire wallboard. Fire barrier walls are typically constructed of drywall or gypsum board partitions with wood or metal framed studs. Use special fiberglass rated for use in firewalls.

19 1 mm air space on each side. Building and structural firewalls in north america are usually made of concrete concrete blocks or reinforced concrete older fire walls built prior to world war ii used brick materials. 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. Table 1 for one hour rated wall assemblies and table 2 for two hour rated wall assemblies.

25 4 mm shaftliner panels friction fit between studs and a minimum 3 4 in. Class 2 to 9 buildings. Fire ratedfire resistance ratings have long been used by ul astm and building codes to measure the performance of various constructions for fire containment purposes. American softwood lumber standard ps 20.