Fire Rated Systems

ClarkDietrich Shaftwall Fire-Rated Information

Shaftwall Intertek Fire-Rated Design Lisitings:

1 & 2 Hours, Non-Bearing Shaftwall - LISTING INFORMATION of ClarkDietrich Steel 'CT' Stud and Tabbed 'J' Runner fire-resistance-rated Shaftwall and Stairwall Wall Assemblies (9/7/2016)


(All infomation below is also listed in the PEI AER-12061 report)


Fire Resistive Rated Assembly Systems

Two-Hour Cavity Stairwall (Non-Load Bearing)

  1. A minimum 25 gauge, 2-1/2" deep ClarkDietrich floor and ceiling J-Tabbed Tracks.
  2. A minimum 25 gauge, 2-1/2" deep ClarkDietrich CT-Studs, spaced 24" o.c. centered between the top and bottom J-Tabbed Tracks with a minimum 1/2" clearance from the web of the J-Tabbed Tracks.
  3. Two (2) layers of 1/2" Type C or 5/8" Type X gypsum board, one layer per side. The face layers should be installed parallel to each face of the framing members with #6 x 1" Type S drywall screws 12" o.c. (Note - Use Type S-12 drywall screws for 20 gauge), 1" from board ends at joints and a minimum of 3/8" from board edges. All edge and end joints should be offset from the base layer minimally 6".
  4. 1" thick fire rated gypsum (Type X). The 1" liner panels should be cut 1" less than the opening height. At the ends the 1" liner panel may be retained by bending the J-runner tabs 90 degrees. If the J-runners are used at end walls, bend the J-Tabbed Tracks tabs 90 degrees, or the 1" liner panels need to be fastened at the ends with 1-5/8" Type S screws spaced 12" o.c.
 
Two-Hour Cavity Shaftwall (Non-Load Bearing)
  1. A minimum 25 gauge, 2-1/2" deep ClarkDietrich floor and ceiling J-Tabbed Tracks.
  2. A minimum 2-1/2" deep ClarkDietrich CT-Studs 25 gauge, centered between the top and bottom J-Tabbed Tracks with a minimum 1/2" clearance from the web of the J-Tabbed Tracks.
  3. The base layer of 1/2" Type C or 5/8" Type X gypsum board should be installed horizontally to the framing members with #6 x 1" Type S drywall screws, 24" o.c., starting 3" maximum from the top and bottom. The butt joint should be centered on a stud flange.
  4. The face layer of 1/2" Type C or 5/8" Type X gypsum board should be installed vertically to the framing members with 1-5/8" Type S drywall screws, maximum 12" o.c. starting 6" from the top and bottom. The vertical edge and butt joints should be offset to different studs from the base layer. The horizontal butt joint in the face layer should be offset 18" from the horizontal edge joint in the base layer.
  5. 1" thick fire rated (Type X) gypsum liner panel. The 1" liner panels should be cut 1" less than the opening height. At the ends of the partition the 1" liner panel may be retained by bending the J-runner tabs 90 degrees, or the 1" liner panels need to be fastened at the ends with 1-5/8" Type S screws spaced 24" o.c.
 
Two-Hour Corridor Ceilings and Stair Soffits Horizontal Assembly
  1. The Two-Hour assembly is constructed as described above in the Two-Hour Shaftwalls. See CT-Stud Horizontal Span Tables for stud size, thickness and maximum spans. See Installation procedures for assembly details and specifications.