1 1/2, 2 AND 3 HOUR UL FIRE RATED WALL SYSTEMS

Fire Resistance Ratings - ANSI/UL 263
Design No. U055

April 16, 2009

Nonbearing Wall Ratings — 1-1/2, 2 or 3 Hr (See Item 4)

1. Floor and Ceiling Runners — (Not shown) — Channel shaped, fabricated from min 22 MSG corrosion-protected steel, min width to accommodate stud size, with min 1-1/4 in. long legs, attached to floor and ceiling with fasteners 24 in. OC max.
2. Steel Studs — Channel shaped, fabricated from min 22 MSG corrosion-protected steel, min width as indicated under Item 4, min 1-1/2 in. flanges, spaced a max of 24 in. OC. Studs to be cut 3/4 in. less than assembly height.
3. Batts and Blankets* — Mineral wool batts, friction fitted between studs and runners. Min nom thickness and min density as indicated under Item 4. See Batts and Blankets (BKNV or BZJZ) Categories for names of Classified companies.
4. Building Units* — 4 ft. wide Type Dragonboard magnesium oxide panels.

1-1/2 Hr Rating — Outer surface of steel studs (Item 2) covered with gasket tape (Item 5) prior to panel installation. Panels installed vertically with vertical joints centered over studs and staggered from vertical joints on opposite side of studs. Horizontal joints staggered from horizontal joints on opposite side of studs and backed by a min 20 MSG, nom 3-1/2 in. wide steel nailer plate (not shown) centered behind the horizontal joint. Outer surface of steel nailer plate covered with gasket tape (Item 5). Plate secured to steel studs prior to panel placement. Max 1/16 in. separation at all panel joints. Joint separation completely filled with fill material (Item 6). Panels attached to studs and plates with 1-1/4 in. long bugle head screws spaced 6 in. OC max at the perimeter and in the field.

2 Hr Rating — Outer surface of steel studs (Item 2) covered with gasket tape (Item 5) prior to panel installation. Panels installed vertically with vertical joints centered over studs and staggered from vertical joints on opposite side of studs. Horizontal joints staggered from horizontal joints on opposite side of studs and backed by a min 20 MSG, nom 4 in. wide steel nailer plate (not shown) centered behind the horizontal joint. Outer surface of steel nailer plate covered with gasket tape (Item 5). Plate secured to steel studs prior to panel placement. Panel joints filled with a 3/16 in. bead of fill material (Item 6) and butted tight. Panels attached to studs and plates with 2 in. long bugle head screws spaced 6 in. OC max at the perimeter and in the field.

3 Hr Rating — A 3 in. wide strip of Type Dragonboard magnesium oxide panel is secured to the outer surface of steel studs (Item 2) prior to panel placement. Panels installed vertically with vertical joints centered over studs and staggered from vertical joints on opposite side of studs. Horizontal joints staggered from horizontal joints on opposite side of studs and backed by a min 18 MSG, nom 4 in. wide steel nailer plate (not shown) centered behind the horizontal joint. Plate secured to steel studs prior to panel placement. Panel joints filled with a 3/16 in. bead of fill material (Item 6) and butted tight. Panels attached to studs and plates with 2 in. long bugle head screws spaced 6 in. OC max at the perimeter and in the field.

The min stud depth and thickness of insulation for the 1-1/2 hr, 2 hr and 3 hr ratings are as follows:

Rating,
Hr
Min Stud
Depth, in.
(Item 2)
Min Thickness
of Insulation
(Item 3)
Min Density
of Insulation
(Item 3)
1-1/2
3-5/8
3 in.
5.7 pcf
2
3-5/8
4 in.
6.1 pcf
3
4
4 in.
6.1 pcf

DRAGONBOARD INC — Nom 9/16 in. thick Type Dragonboard.

5. Gasket Tape — Foam isolator tape with foiled backing, 1-1/4 in. wide by 1/8 in. thick, with pressure-sensitive adhesive on one side.

6. Fill, Void or Cavity Materials* — All vertical and horizontal joints of building unit panels covered with a 4 in. wide, min 1/8 in. thick layer of fill material. Screw heads covered with fill material.

PASSIVE FIRE PROTECTION PARTNERS — Type 4800DW Sealant.

*Bearing the UL Classification Mark

Last Updated on 2009-04-16

Copyright © 2009 Underwriters Laboratories Inc.®

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