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Fire Rated System Design - ULC W423 or UL U425
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ULC W423 or UL U425

Interior Partitions - Steel Stud (Non-loadbearing)

Fire Rating

1 hour

STC

49 USG-810940

Assembly thickness

203 mm (8")

Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
Steel Studs - 152.4 mm (6 in.) 0.8 mm (20) gauge steel stud spaced @ max 610 mm (24 in.) o.c.
Batts and Blankets - 50.8 mm (2 in.) mineral wool batt insulation
Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
  • Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
  • Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
  • Steel Studs - 152.4 mm (6 in.) 0.8 mm (20) gauge steel stud spaced @ max 610 mm (24 in.) o.c. - 600S125-30
  • Batts and Blankets - 50.8 mm (2 in.) mineral wool batt insulation
  • Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally
  • Gypsum Board - 12.7 mm (1/2 in.) thick gypsum board applied vertically or horizontally

For more information visit   U425 · ULC W423 ·