1. Floor and Ceiling Runners: (Not Shown) Channel shaped, fabricated from minimum 25 MSG corrosion protected steel, minimum width to accomodate stud size, with minimum 1" long legs, attached to floor and ceiling with fasteners 24" o.c. maximum

2. Steel Studs: Channel shaped, fabricated from minimum 25 MSG corrosion-protected steel, minimum width as indicated under Item 4, minimum 1-1/4" flanges ands 1/4" return, spaced a maximum of 24" o.c. Studs to be cut 3/8 to 3/4 in. less than assembly height.

3. Batts and Blankets: (Required as indicated under Item 4) - Mineral wood batts, friction fitted between studs and runners. Minimum nom thickness as indicated under Item 4. See Batts and Blankets (BKNV or BZJZ) Categories for names of Classified companies.

3a. Batts and Blankets: (Optional) - Placed in stud cavities, any glass fiber or mineral wood insulation bearing the UL Classification Marking as to Surface Burning Characteristics and/or Fire Resistance. See Batts and Blankets (BKNV or BZJZ) Categories for names of Classified companies.

4. Gypsum Board: Gypsum panels with beveled, square or tapered edges. For single layer systems gypsum panels applied vertically with joint centered over studs. For single layer systems (constructed with 1/2" thick board) gypsum panels applied vertically or horizontally with vertical joints centered over studs. For two layer systems gypsum panels to be applied vertically with joints centered over studs and staggered one stud cavity on opposite sides of studs. Outer layer of gypsum panels may be applied vertically or horizontally for systems with 1/2" thick board. Vertical joints in adjacent layers staggered one stud cavity. For three and four layer systems iiner layers to be applied vertically with joints centered over studs and staggered one stud cavity on opposite sides of studs. Vertical joints in adjacent layers staggered one stud cavity. Outer layer may be applied vertically or horizontally. The thickness and number of layers for the 1, 2, 3 and 4 hour ratings are as follows:

(check back with Kenneth)

5. Fasteners: (Not shown) - Types S or S-12 steel screws used to attach panels to studs (Item 2).

Single layer systems: 1" long for 1/2" and 5/8" thick panels, spaced 8" o.c. along edges of board and 12" o.c. in the field of board.

Two layer systems: First layer - 1" long for 1/2" and 5/8" thick panels, spaced to 16" o.c. with screws offset 8" from first layer.

Three-layer systems: First layer - 1" long for 1/2", 5/8" thick panels, spaced 24" o.c. Second layer - 1-5/8" long for 1/2", 5/8" thick panels, spaced 24" o.c. Third layer - 2-1/4" long for 1/2" thick panels or 2-5/8" long for 5/8" thick panels, spaced 12" o.c. Screws offset minimum 6" form layer below.

Four-layer systems: First layer - 1" long for 1/2", 5/8" thick panels, spaced 24" o.c. Second layer - 1-5/8" long for 1/2", 5/8" thick panels spaced 24" o.c. Third layer - 2-1/4" long for 1/2" thick panels or 2-5/8" long for 5/8" thick panels, spaced 24" o.c. Fourth layer - 2-5/8" long for 1/2" thick panels or 3" long for 5/8" thick panels, spaced 12" o.c. Screws offset minimum 6" from layer below.

6. Joint Tape and Compund: (not shown) Vinyl or casein, dry or premixed joint compound applied in two coats to joints and screw heads of outer layers. Paper tape, nom 2" wide, embedded in first layer of compound over all joints of outer panels.

7. Furring Channels: (Optional, not shown, for single or double layer system) - Resilient furring channels fabricated from minimum 25 MSG corrosion-protected steel, spaced a max of 24" o.c. Flange portion attached to each intersecting stud with 1/2" long Type S-12 steel screws.

8. Siding, Brick or Stucco: (Optional, not shown) - Aluminum, vinyl or steel siding, brick veneer or stucco, meeting the requirments of local code agencies, installed over gypsum panels. Brick veneer attached to studs with corrugated metal wall ties attached to each stud with steel screws, not more than each sixth course of brick.