A Type C steel backing plate is mounted within a metal stud wall framing assembly to support upper cabinets and wall-mounted equipment. The assembly features a continuous fourteen gauge by six-inch steel plate fastened to continuous studs with three number ten pan head self-tapping metal screws per stud, with stud flanges running continuous and four-inch minimum sixteen gauge studs extending to the structure above. A four-inch sixteen gauge deep leg runner track acts as a stiffener and is notched tight around the studs. A companion plan detail shows a three-hour UL design rated partition assembly with continuous gypsum board facing behind intersecting non-rated wall framing.
C BACKING PLATE TYPE C A (3) #10 PAN HEAD SMS PER STUD NOTES: 1. TYPE C BACKING PLATE TO BE USED FOR ALL UPPER WALL MOUNTED CABINETS (OVER 2 SHELVES) AND WALL MOUNTED EQUIPMENT WHICH WEIGH OR SUPPORT WEIGHTS OF LESS THAN 200 POUNDS PER L.F. 2. DESIGN LOAD ECCENTRICITY FROM FACE OF WALL 'e'= 8" MAX. STUD FLANGES TO BE CONTINUOUS. 3. CONFIRM LENGTH, HEIGHT AND LOCATION OF BACKING PLATE AND NUMBER REQ'D WITH ITEM TO BE MOUNTED. 1/4" MAX. PLATE TO RUNNER TRACK 1-24 4" MIN 16 GA. STUD EXTENDING TO STRUCTURE ABOVE. FOR HEIGHTS OVER 12'-0" USE PAIRED 16 GA. STUDS STIFFENER: 4" 16 GA. DEEP LEG RUNNER TRACK, NOTCHED TIGHT AROUND STUDS 14 GA. X 6" CONT. STEEL PLATE, U.O.N., 2 STUD BAYS MIN. WHERE EQUIPMENT OPERATING WEIGHT EXCEEDS 400 LBS USE PLATE CONT. OVER 3 BAYS MIN. 1" 1/8" 1/8" TYP. BACKING PLATE DETAILS 7 2 HOUR RATED PARTITION AS CONTINUOUS GYP. BD. FACING BEHIND INTERSECTING WALL FRAMING FIRE RATED WALL ASSEMBLY AS SCHED. NON-RATED WALL ASSEMBLY AS SCHED. INTERSECTING WALL FRAMING PARTITION - 3 HR UL DESIGN: U419
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