This T-intersection assembly utilizes metal studs with thermal insulation and two layers of five-eighths-inch gypsum board on each side. To maintain a continuous air barrier, the two layers of gypsum board are carried through the wall intersection. A sealed sheet metal or flexible flashing and air membrane (FFSAM) is applied at the junction, except where fire-rated wall assemblies require specific alternative detailing. A vapor barrier is installed on the data hall side of the wall as required. Refer to sheet A-61005 for additional information regarding Underwriters Laboratories design number U419.
THERMAL INSULATION SEE A-61005 FOR ADDITIONAL INFORMATION FOR UL NO: U419 METAL STUD 5/8" GYPSUM BOARD 5/8" GYPSUM BOARD SEALED SHEET METAL OR FFSAM MEMBRANE FOR CONTINUOUS AIR BARRIER ACCEPTABLE EXCEPT AT RATED WALL ASSEMBLIES WHERE REQUIRED CONTINUOUS GYPSUM BOARD FORMS AIR BARRIER VAPOR BARRIER ON DATA HALL SIDE OF WALL, AS OCCURS SEE PLAN/SECT XX SEE PLAN/SECT XX (2) LAYERS OF 5/8" GYPSUM BOARD CONTINUE (2) LAYERS OF 5/8" GYPSUM BOARD THROUGH WALL INTERSECTION TO PROVIDE CONTINUOUS AIR BARRIER
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