Fire-Resistant Assemblies - USG Corporation

E
Structural Fireproofing
Beam
2 Hour Fire-Rated Construction Reference
Construction Detail Description Test Number Comments Index
3 Hour Fire-Rated Construction
3 7 ⁄8"
4"
2 3 ⁄4"
2 3 ⁄4"
4"
4 1 ⁄8"
4 Hour Fire-Rated Construction
1 7 ⁄8" 1 7 ⁄8"
• 5/8" Sheetrock Firecode Core gypsum UL Des N501, Structural member tested: E-25
panels N502 W8 x 24 (beam only)
– 1-5/8" steel run channel brackets 24" o.c.
– 1-3/8" x 7/8" corner angles attached to channel
brackets
– joints finished
– 2-1/2" concrete deck on fluted steel floor
• optional veneer plaster
– 1-5/8" steel run channel brackets 24" o.c. UL Des N505 Structural member tested: E-26
– 7/8" x 1-3/8" corner angles attached to brackets W8 x 24 (beam only)
• 5/8" Sheetrock Firecode Core gypsum Fire rating for restrained assembly; 2 hour
panels rating for unrestrained assembly
– 1" 20 gauge hex mesh on bottom over middle
layer
– joints finished
– 2-1/2" concrete deck on fluted steel floor
– 1-5/8" steel run channel brackets 24" o.c. UL Des N505 Structural member tested: E-27
– 1/8" x 1-3/8" corner angles attached to W8 x 24 (beam only)
channel brackets
• 5/8" imperial Firecode Core gypsum
Base
– 1" 20 gauge hex mesh on bottom
over middle layer
– metal beads on corners
– joints taped
• 1/16" veneer plaster finish
– 2-1/2" concrete deck on fluted steel floor
– 3.4 lb self-furring diamond mesh metal lath UL Des D403 Structural member tested: E-28
enclosing beam W12 x 58
• 1-1/2" 100:2 gypsum-perlite plaster Suitable for protection of beams and girders
56 USG Fire-Resistant Assemblies