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UL Number
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Fire Rating
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Description of Assembly
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U418
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45 min
to
2 hrs
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Brick Veneer / Steel Stud, Loadbearing
- (45 min): (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- (1 hr): (2) layers in. (12.7 mm) thick gypsum wallboard
- (2 hr): (3) layers in. (12.7 mm) thick gypsum wallboard
- 3 or 5 in., (89 or 140 mm) 18 gage, steel studs, spaced at 24 in. (610 mm) o.c., with 3 in.(89 mm)
thick glass fiber batt insulation
- (1) layer in. (12.7 mm) thick exterior gypsum sheathing
- 1 in. (25.4 mm) air space
- 4 in. (102 mm) nominal clay facing brick laid in mortar with metal ties at 24 in. (610 mm) o.c.
horizontally and 16 in. (406 mm) o.c. vertically
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U424
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45 min.
to
2 hrs
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Brick Veneer / Steel Stud, Loadbearing
- (45 min): (1) layer
⅝ in. (15.9 mm) thick gypsum wallboard
- (1 hr): (2)
layers in. (12.7 mm) thick gypsum wallboard
- (1 1/2 hr): (2) layers
⅝ in. (15.9 mm) thick gypsum wallboard
- (2 hr): (3)
layers in. (12.7 mm) or (2) layers in. (19.1 mm) thick gypsum wallboard
- 3 in. (89 mm), 20 gage steel studs, spaced up to 24 in. (610 mm) o.c., with 3 in. (89 mm) thick glass fiber or mineral
wool batt or blanket insulation
- (1) layer or ⅝ in. (12.7 or 15.9 mm) thick exterior gypsum sheathing
- Air space thickness not specified
- 3 in. (95 mm) min. brick veneer with corrugated metal wall ties attached to each stud with steel screws, not more than
each sixth course of brick
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U425
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45 min.
to
2 hrs
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Brick Veneer / Steel Stud, Loadbearing
- (45 min): (1) layer
⅝ in. (15.9 mm) thick gypsum wallboard
- (1 hr): (2)
layers in. (12.7 mm) thick gypsum wallboard
- (1 1/2 hr): (2) layers
⅝ in. (15.9 mm) thick gypsum wallboard
- (2 hr): (3) layers in. (12.7 mm) or (2) layers in. (19.1 mm) thick gypsum wallboard
- 3 in. (89 mm), 20 gage steel studs, spaced up to 24 in. (610 mm) o.c., with 3 in. (89 mm) thick glass fiber or mineral
wool batt or blanket insulation
- (1) layer or ⅝ in. (12.7 or 15.9 mm) thick exterior gypsum sheathing
- Air space thickness not specified
- 3 in. (95 mm) brick veneer with corrugated metal wall ties attached to each stud with steel screws, not more than each
sixth course of brick
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V434
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1 hr
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Brick Veneer / Steel Stud, Loadbearing
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- 3 in. (89 mm), 20 gage, steel studs with max. spacing at 24 in. (610 mm) o.c., with 3 in.(89 mm) thick glass fiber
batt insulation
- 2 in. (51 mm) max. thick foamed plastic
- 1 in. (25.4 mm) min. air space
- 4 in. (102 mm) nominal brick veneer with wall anchor ties attached to studs at max. 24 in.(610 mm) o.c.
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V454
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1 hr
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Brick Veneer / Steel Stud, Loadbearing
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- 3 in. (89 mm), 20 gage, steel studs at max. spacing of 24 in. (610 mm) o.c.
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- 4 in. (102 mm) max. thick rigid polystyrene insulation
- 1 in. (25.4 mm) min. air space
- 4 in. (102 mm) nominal brick veneer with wall anchor ties attached to studs at max. 24 in.(610 mm) o.c.
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V458
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45 min
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Brick Veneer / Steel Stud, Loadbearing
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard bearing UL Classification Mark
- 3⅝ in. (92 mm) 18 gage steel studs at max. spacing of 24 in. (610 mm) o.c. with nominal 3.5 pcf mineral wool batt
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- 1 in. (25.4 mm) min. air space
- 3 in. (95 mm) min. thick brick veneer with corrugated metal wall ties attached to each stud with steel screws, not
more than each sixth course of brick
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V414
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3hr interior
1hr exterior
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Brick Veneer / Steel Stud,
NON-Loadbearing
- (1) layer ⅝ in. (15.9 mm) thick gypsum wallboard
- 3⅝ in. (92 mm) wide, 1⅝ in. (41 mm) legs, 20 gage steel studs, spaced 16 in. (406 mm) o.c., studs
cut in. (19.1 mm) less than assembly height
- 2 in. (51 mm) thick foamed plastic (rigid insulation)
- 2 in. (51 mm) air space
- 4 in. (102 mm) nominal clay facing brick laid in mortar with metal ties at 16 in. (406 mm) o.c. max. each way
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