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UL Number
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Fire Rating
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Description of Assembly
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U302
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2 Hours
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Brick Veneer / Wood Stud, Loadbearing
- (2) layers ⅝ in. (15.9 mm) thick gypsum wallboard or nominal 3⁄32 in. (2.4 mm) thick gypsum veneer
plaster on Classified veneer baseboard
- (1) layer in. (12.7 mm) thick exterior gypsum sheathing
- 1 (25.4 mm) in. (51 102 mm) air space
- nominal 2 4 in. wood studs spaced at 16 in. (406 mm) o.c.
- nominal 4 in. (102 mm) clay facing brick laid in mortar with in. (19.1 mm) wide 6⅝ in. 168mm) long 20
MSG corrugated wall ties spaced at 16 in. (406 mm) o.c. each way
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U356
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1 Hour
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Brick Veneer / Wood Stud, Loadbearing
- (1) layer ⅝ in. (15.9 mm) thick gypsum board
- nominal 2 4 in. (51 102 mm) wood studs spaced at 16 in. (406 mm) o.c., with 3 in. (89 mm) thick glass fiber
batt or spray applied cellulose insulation
- 7⁄16 in. (11.1 mm) min. thick wood structural panels or min. in. (12.7 mm) thick mineral and fiber boards
- 1 in. (25.4 mm) air space
- nominal 4 in. (102 mm) brick veneer with corrugated metal wall ties spaced not more than each sixth course of brick and max. 32 in. (813 mm) o.c. horizontally
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U35
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1 Hour
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Brick Veneer / Wood Stud, Loadbearing
- (2) layer ⅝ in. (15.9 mm) thick gypsum board
- nominal 2 4 in. (51 102 mm) wood studs spaced at 16 in. (406 mm) o.c. with min. 3 in. (76 mm) mineral wool
batt insulation
- (1) layer ⅝ in. (15.9 mm) thick gypsum board
- 1 in. (25.4 mm) air space
- nominal 4 in. (102 mm) brick veneer with corrugated metal wall ties attached with screws and spaced not more than each
fourth course and a max. 24 in. (610 mm) o.c. horizontally
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