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<br />Design No. U419 (November 14, 2007)
<br />Nonbearing Wall Ratings — 1, 2, 3 or 4 Hr (See Items 4 & 5)
<br />1. Floor and Ceiling Runners — (Not shown) — For use with Item 2 - Channel shaped, fabricated from min
<br />25 MSG corrosion -protected steel, min width to accommodate stud size, with min 1 in. long legs, attached to
<br />floor and ceiling with fasteners 24 in. OC max.
<br />IA. Floor and Ceiling Runners* — Not shown - In lieu of Item 1 — For use with Item 2A, proprietary
<br />channel shaped, min. 3-5/8 in. wide with 1 in. long legs, fabricated from min. 0.0150 in. (0.0146 in., min bare
<br />metal thickness) galvanized steel, attached to floor and ceiling with fasteners 24 in. OC max. - Dietrich
<br />Industries Inc — U1traSTEELO.
<br />1B. Floor and Ceiling Runners — (Not shown - In lieu of Item 1) — For use with Item 2A, proprietary
<br />channel shaped, min. 2-9/16 in. wide with 1-3/16 in. wide flanges, fabricated from min. 0.0150 in. galvanized
<br />steel, attached to floor and ceiling fasteners 24 in. OC. max. - Dietrich Industries Inc — U1traSTEELO.
<br />2. Steel Studs — Channel shaped, fabricated from min 25 MSG corrosion -protected steel, min width as
<br />indicated under Item 5, min 1-1/4 in. flanges and 1/4 in. return, spaced a max of 24 in. OC. Studs to be cut 3/8
<br />to 3/4 in. less than assembly height.
<br />2A. Steel Studs* — In lieu of Item 2 - Proprietary channel shaped studs, min. width as indicated under Item 5,
<br />min. 1-1/4 in. long legs and 1/4 in. long folded back return flange legs, fabricated from min. 0.0155 in.
<br />(0.0149 in., min bare metal thickness) galvanized steel, spaced a max of 24 in. OC. Studs to be cut 3/8 to 3/4
<br />in. less than assembly height. Allowable use of studs is shown in the table below. For direct attachment of
<br />gypsum board only. - Dietrich Industries Inc — UltraSTEELO.
<br />2B. Steel Studs — (As an alternate to Item 2, For use with Item 513) Channel shaped, fabricated from min 20
<br />MSG (0.0327 in. thick) corrosion -protected or galv steel, 3-1/2 in. min width, min 1-1/2 in. flanges and 1/4 in.
<br />return, spaced a max of 16 in. OC. Studs friction -fit into floor and ceiling runners. Studs to be cut 5/8 to 3/4
<br />in. less than assembly height.
<br />3. Wood Structural Panel Sheathing — (Optional, For use with Item 5 Only.)- (Not Shown) - 4 ft wide, 7/16
<br />in. thick oriented strand board (OSB) or 15/32 in. thick structural 1 sheathing (plywood) complying with DOC
<br />PSI or PS2, or APA Standard PRP-108, manufactured with exterior glue, applied horizontally or vertically to
<br />the steel studs. Vertical joints centered on studs, and staggered one stud space from wallboard joints. Attached
<br />to studs with flat -head self -drilling tapping screws with a min. head diam. of 0.292 in. at maximum 6 in. OC.
<br />in the perimeter and 12 in. OC. in the field.
<br />4. Batts and Blankets* — (Required as indicated under Item 5) — Mineral wool batts, friction fitted between
<br />studs and runners. Min nom thickness as indicated under Item 5. See Batts and Blankets (BKNV or BZJZ)
<br />Categories for names of Classified companies.
<br />4A. Batts and Blankets* — (Optional) — Placed in stud cavities, any glass fiber or mineral wool insulation
<br />bearing the UL Classification Marking as to Surface Burning Characteristics and/or Fire Resistance. See Batts
<br />and Blankets (BKNV or BZJZ) Categories for names of Classified companies.
<br />5. Gypsum Board* — Gypsum panels with beveled, square or tapered edges, applied vertically or horizontally.
<br />Vertical joints centered over studs and staggered one stud cavity on opposite sides of studs. Vertical joints in
<br />adjacent layers (multilayer systems) staggered one stud cavity. Horizontal joints need not be backed by steel
<br />framing. Horizontal edge joints and horizontal butt joints on opposite sides of studs need not be staggered.
<br />Horizontal edge joints and horizontal butt joints in adjacent layers (multilayer systems) staggered a min of 12
<br />in. The thickness and number of layers for the 1 hr, 2 hr, 3 hr and 4 hr ratings are as follows:
<br />Wallboard Protection on Each Side of Wall
<br />Min
<br />Min
<br />No. of
<br />Min
<br />Stud
<br />Stud
<br />Layers
<br />Thkns of
<br />Depth,
<br />Depth,
<br />& Thkns
<br />Insulation
<br />Rating
<br />Item 2
<br />Item 2A
<br />of Panel
<br />(Item 4)
<br />1
<br />3-1/2
<br />3-5/8
<br />1 layer, 5/8 in. thick
<br />Optional
<br />1
<br />2-1/2:
<br />3-5/8::
<br />1 layer, 1/2 in. thick
<br />1-1 /2 in.
<br />1
<br />1 5/8
<br />3-5/8
<br />1 layer, 3/4 in. thick
<br />Optional
<br />2
<br />1 5/8
<br />2-1/2
<br />2 layers, 1/2 in. thick
<br />Optional
<br />2
<br />1 5/8
<br />2-1/2
<br />2 layers, 5/8 in. thick
<br />Optional
<br />2
<br />3-1/2
<br />3-5/8
<br />1 layer, 3/4 in. thick
<br />3 in.
<br />3
<br />1-5/8
<br />2-1/2
<br />3 layers, 1/2 in. thick
<br />Optional
<br />3
<br />1-5/8
<br />2-1/2
<br />2 layers, 3/4 in. thick
<br />Optional
<br />3
<br />1 5/8
<br />2-1/2 :
<br />3 layers, 5/8 in. thick :
<br />Optional
<br />4
<br />1 5/8
<br />2-1/2
<br />4 layers, 5/8 in. thick
<br />Optional
<br />4
<br />1-5/8
<br />2-1/2
<br />4 layers, 1/2 in. thick
<br />Optional
<br />4
<br />2 1/2
<br />2-1/2
<br />2 layers, 3/4 in. thick :
<br />2 in.
<br />CANADIAN GYPSUM COMPANY —1/2 in. thick Type C, IP-X2 or IPC-AR; WRC, 5/8 in. thick Type AR,
<br />C, IP-AR, IP-X1, IP-X2, IPC-AR, SCX, SHX, WRX or WRC; 3/4 in. thick Types IP-X3 or ULTRACODE
<br />United States Gypsum CO — 1/2 in. thick Type C, IP-X2, IPC-AR or WRC; 5/8 in. thick Type SCX, SHX,
<br />WRX, IP-X1, AR, C, WRC, FRX-G, IP-AR, IP-X2, IPC-AR ; 3/4 in. thick Types IP-X3 or ULTRACODE
<br />USG MEXICO S A DE C V — 1/2 in. thick Type C, IP-X2, IPC-AR or WRC; 5/8 in. thick Type AR, C, IP-
<br />AR, IP-X1, IP-X2, IPC-AR, SCX, SHX, WRX, WRC or; 3/4 in. thick Types IP-X3 or ULTRACODE
<br />When Item 713, Steel Framing Members*, is used, Nonbearing Wall Rating is limited to 1 Hr. Min. stud depth is
<br />3-1/2 in., min. thickness of insulation (Item 4) is 3 in., and two layers of gypsum board panels (1/2 in. or 5/8
<br />UL Details
<br />SCALE: NTS
<br />in. thick) shall be attached to furring channels as described in Item 6. One layer of gypsum board panels (1/2 in.
<br />or 5/8 in. thick) attached to opposite side of stud without furring channels as described in Item 6.
<br />5A. Gypsum Board* — (As an alternate to Item 5) — 5/8 in. thick, 24 to 54 in. wide, applied horizontally as
<br />the outer layer to one side of the assembly. Secured as described in Item 6. - Canadian Gypsum Co — Type
<br />SHX.; US Gypsum Co — Type FRX-G, SHX.; USG Mexico S A DE C V — Type SHX.
<br />5B. Gypsum Board* — (As an alternate to Item 5 when used as the base layer on one or both sides of wall, For
<br />direct attachment only, not to be used with Item 3) - Nom 5/8 in. thick lead backed gypsum panels with
<br />beveled, square or tapered edges, applied vertically. Vertical joints centered over studs and staggered min 1
<br />stud cavity on opposite sides of studs. Wallboard secured to studs with 1-1/4 in. long Type S-12 steel screws
<br />spaced 8 in. OC at perimeter and 12 in. OC in the field. - Ray -Bar Engineering Corp — Type RB-LBG
<br />6. Fasteners — (Not shown) — For use with Item 2 - Type S or S- 12 steel screws used to attach panels to studs
<br />(Item 2) or furring channels (Item 7). Single layer systems: 1 in. long for 1/2 and 5/8 in. thick panels or 1-1/4
<br />in. long for 3/4 in. thick panels, spaced 8 in. OC when panels are applied horizontally, or 8 in. OC along
<br />vertical and bottom edges and 12 in. OC in the field when panels are applied vertically. Two layer systems:
<br />First layer- 1 in. long for 1/2 and 5/8 in. thick panels or 1-1/4 in. long for 3/4 in. thick panels, spaced 16 in.
<br />OC. Second layer- 1-5/8 in. long for 1/2 in., 5/8 in. thick panels or 2-1/4 in. long for 3/4 in. thick panels,
<br />spaced 16 in. OC with screws offset 8 in. from first layer. Three -layer systems: First layer- 1 in. long for 1/2
<br />in., 5/8 in. thick panels, spaced 24 in. OC. Second layer- 1-5/8 in. long for 1/2 in., 5/8 in. thick panels, spaced
<br />24 in. OC. Third layer- 2-1/4 in. long for 1/2 in., 5/8 in. thick panels or 2-5/8 in. long for 5/8 in. thick panels,
<br />spaced 12 in. OC. Screws offset min 6 in. from layer below. Four -layer systems: First layer- 1 in. long for
<br />1/2 in., 5/8 in. thick panels, spaced 24 in. OC. Second layer- 1-5/8 in. long for 1/2 in., 5/8 in. thick panels,
<br />spaced 24 in. OC. Third layer- 2-1/4 in. long for 1/2 in. thick panels or 2-5/8 in. long for 5/8 in. thick panels,
<br />spaced 24 in. OC. Fourth layer- 2-5/8 in. long for 1/2 in. thick panels or 3 in. long for 5/8 in. thick panels,
<br />spaced 12 in. OC. Screws offset min 6 in. from layer below.
<br />6A. Fasteners — (Not shown) —For use with Item 2A - Type S or S-12 steel screws used to attach panels to
<br />studs (Item 2). Single layer systems: 1 in. long for 1/2 and 5/8 in. thick panels or 1-1/4 in. long for 3/4 in.
<br />thick panels, spaced 8-1/2 in. OC with additional screws 1 in. and 2-1/2 in. from edges of the board when
<br />panels are horizontally. or 8 in. OC along vertical and bottom edges and 12 in. OC in the field when panels
<br />are applied vertically. Two layer systems applied vertically: First layer- 1 in, long for 1/2 and 5/8 in. thick
<br />panels or 1-1/4 in. long for 3/4 in. thick panels, spaced 16 in. OC. Second layer- 1-5/8 in. long for 1/2 in., 5/8
<br />in. thick panels or 2-1/4 in. long for 3/4 in. thick panels, spaced 16 in. OC with screws offset 8 in. from first
<br />layer. Two layer systems applied horizontally: First layer- 1 in. long for 1/2 and 5/8 in. thick panels or 1-1/4
<br />in. long for 3/4 in. thick panels, spaced 16 in. OC starting 8 in. from each edge of the board with an additional
<br />screw placed 1-1/4 in. from each edge of the board. Second layer- 1-5/8 in. long for 1/2 in., 5/8 in. thick
<br />panels or 2-1/4 in. long for 3/4 in. thick panels, spaced 16 in. OC starting 8 in. from each edge of the board
<br />with an additional screw placed 1-1/4 in. from each edge of the board with screws offset 8 in. from first layer.
<br />Three -layer systems: First layer- 1 in. long for 1/2 in., 5/8 in. thick panels, spaced 24 in. OC. Second layer-
<br />1-5/8 in. long for 1/2 in., 5/8 in. thick panels, spaced 24 in. OC. Third layer- 2-1/4 in. long for 1/2 in., 5/8 in.
<br />thick panels or 2-5/8 in. long for 5/8 in. thick panels, spaced 12 in. OC. Screws offset min 6 in. from layer
<br />below. For all layers, an additional screw shall be placed 1-1/4 in. from each edge of the board. Four -layer
<br />systems: First layer- I in. long for 1/2 in., 5/8 in. thick panels, spaced 24 in. OC. Second layer- 1-5/8 in. long
<br />for 1/2 in., 5/8 in. thick panels, spaced 24 in. OC. Third layer- 2-1/4 in. long for 1/2 in. thick panels or 2-5/8
<br />in. long for 5/8 in. thick panels, spaced 24 in. OC. Fourth layer- 2-5/8 in. long for 1/2 in. thick panels or 3 in.
<br />long for 5/8 in. thick panels, spaced 12 in. OC. Screws offset min 6 in. from layer below. For all layers, an
<br />additional screw shall be placed 1-1/4 in. from each edge of the board.
<br />7. Furring Channels — (Optional, not shown, for single or double layer systems) — Resilient furring channels
<br />fabricated from min 25 MSG corrosion -protected steel, spaced vertically a max of 24 in. OC. Flange portion
<br />attached to each intersecting stud with 1/2 in. long Type S-12 steel screws. Not for use with Item 5A.
<br />7A. Steel Framing Members (Not Shown)* — (Optional on one or both sides, not shown, for single or double
<br />layer systems) — As an alternate to Item 7, furring channels and Steel Framing Members as described below:
<br />a. Furring Channels — Formed of No. 25 MSG galv steel. 2-3/8 in. wide by 7/8 in. deep, spaced max. 24
<br />in. OC perpendicular to studs. Channels secured to studs as described in Item b. Gypsum board attached to
<br />furring channels as described in Item 6. Not for use with Item 5A.
<br />b. Steel Framing Members* — Used to attach furring channels (Item 7Aa) to studs (Item 2). Clips spaced
<br />max. 48 in. OC. RSIC-1 clips secured to studs with No. 8 x 1-1/2 in. minimum self -drilling, S-12 steel
<br />screw through the center grommet. RSIC-V clips secured to studs with No. 8 x 9/16 in. minimum self -
<br />drilling, S-12 steel screw through the center hole. Furring channels are friction fitted into clips. - PAC
<br />International Inc — Types RSIC-1, RSIC-V.
<br />7B. Steel Framing Members (Optional, Not Shown)* — As an alternate to Item 7, furring channels and Steel
<br />Framing Members on only one side of studs as described below:
<br />a. FurringChannels — Formed of No. 25 MSG galv steel, spaced 24 in. OC perpendicular to studs.
<br />g P P rP
<br />Channels secured to studs as described in Item b. Batts and Blankets placed in stud cavity as described in
<br />Item 5. Two layers of gypsum board attached to furring channels
<br />as described in Item 5. Not for use with
<br />Item 5A.
<br />b. Steel Framing Members* — Used to attach furring channels (Item 713a) to one side of studs (Item 2)
<br />only. Clips spaced 48 in. OC. and secure t with -
<br />Y P P
<br />d to studs t two No. 8 x 2 1/2 in. coarse drywall screws, one
<br />through the hole at each end of the clip. Furring channels are friction fitted into clips. - Kinetics Noise
<br />Control Inc — Type Isomax
<br />8. Joint Tape and Compound — Vinyl or casein, dry or remixed joint
<br />compound applied in two coats to
<br />joints and screw heads of outer layers. Paper tape, nom 2 in. wide, embedded in first layer of compound over
<br />all Joints of outer layer panels. Paper tape and joint compound may be omitted when gypsum panels are
<br />supplied with a square edge.
<br />9. Siding, Brick or Stucco — (Optional, not shown) — Aluminum, vinyl or steel siding, brick veneer or
<br />stucco, meeting the requirements of local code agencies, installed over gypsum panels. Brick veneer attached
<br />to studs with corrugated metal wall ties attached to each stud with steel screws, not more than each sixth
<br />course of brick.
<br />10. Caulking and Sealants* — (Optional, not shown) — A bead of acoustical sealant applied around the
<br />partition perimeter for sound control. - US Gypsum Co — Type AS
<br />11. Lead Batten Strips — (Not Shown, For Use With Item 513) - Lead batten strips, min 1-1/2 in. wide, max 10
<br />ft long with a max thickness of 0.125 in. Strips placed on the interior face of studs and attached from the
<br />exterior face of the stud with two 1 in. long Type S- 12 pan head steel screws, one at the top of the strip and
<br />one at the bottom of the strip. Lead batten strips to have a purity of 99.9% meeting the Federal specification
<br />QQ-L-201f, Grade "C". Lead batten strips required behind vertical joints of lead backed gypsum wallboard
<br />(Item 513) and optional at remaining stud locations. Required behind vertical joints.
<br />12. Lead Discs or Tabs — (Not Shown, For Use With Item 513) - Used in lieu of or in addition to the lead
<br />batten strips (Item 11) or optional at other locations - Max 3/4 in. diam by max 0.125 in. thick lead discs
<br />compression fitted or adhered over steel screw heads or max 1/2 in. by 1-1A in. by max 0.125 in. thick lead
<br />tabs placed on gypsum boards (Item 513) underneath screw locations prior to the installation of the screws.
<br />Lead discs or tabs to have a purity of 99.9% meeting the Federal specification QQ-L-201f, Grade "C".
<br />*Bearing the UL Classification Mark
<br />System No. W-L-1001 (June 15, 2005)
<br />F Ratings —1, 2, 3 and 4 Hr (See Items 2 and 3) T Ratings — 0, 1, 2, 3, and 4 Hr (See Item 3)
<br />L Rating At Ambient — less than 1 CFM/sq ft L Rating At 400 F — less than 1 CFM/sq ft
<br />AA
<br />3 3
<br />I Y
<br />T.
<br />C16)
<br />SECTION A -A
<br />1. Wall Assembly — The 1, 2, 3 or 4 hr fire -rated gypsum wallboard/stud wall assembly shall be constructed
<br />of the materials and in the manner described in the individual U300 or U400 Series Wall or Partition
<br />Designs in the UL Fire Resistance Directory and shall include the following construction features:
<br />A. Studs — Wall framing may consist of either wood studs (max 2 h fire rated assemblies) or steel channel
<br />studs. Wood studs to consist of nom 2 by 4 in. (51 by 102 mm) lumber spaced 16 in. (406 mm) OC with
<br />nom 2 by 4 in. (51 by 102 mm) lumber end plates and cross braces. Steel studs to be min 3-5/8 in. (92
<br />mm) wide by 1-3/8 in. (35 mm) deep channels spaced max 24 in. (6 10 mm) OC.
<br />B. Gypsum Board* — Nom 1/2 or 5/8 in. (13 or 16 mm) thick, 4 ft. (122 cm) wide with square or tapered
<br />edges. The gypsum wallboard type, thickness, number of layers, fastener type and sheet orientation shall
<br />be as specified in the individual U300 or U400 Series Design in the UL Fire Resistance Directory. Max
<br />diam of opening is 26 in. (660 mm).
<br />2. Through -Penetrant — One metallic pipe, conduit or tubing installed either concentrically or eccentrically
<br />within the firestop system. The annular space between pipe, conduit or tubing and periphery of opening
<br />shall be min of 0 in / (0 mm). (point contact) to max 2 in. (51 mm) Pipe, conduit or tubing to be rigidly
<br />supported on both sides of wall assembly. The following types and sizes of metallic pipes, conduits or
<br />tubing may be used:
<br />A. Steel Pipe — Nom 24 in. (610 mm) diam (or smaller) Schedule 10 (or heavier) steel pipe.
<br />B. Iron Pipe — Nom 24 in. (610 mm) diam (or smaller) service weight (or heavier) cast iron soil pipe, nom
<br />12 in (305 mm) diam (or smaller) or Class 50 (or heavier) ductile iron pressure pipe.
<br />C. Conduit — Nom 6 in. (152 mm) diam (or smaller) steel conduit or nom 4 in (102 mm) diam (or smaller)
<br />steel electrical metallic tubing
<br />D. Copper Tubing — Nom 6 in. (152 mm) diam (or smaller) Type L (or heavier) copper tubing
<br />E. Copper Pipe — Nom 6 in. (152 mm) diam (or smaller) Regular (or heavier) copper pipe.
<br />F. Through Penetrating Product* — Flexible Metal Piping The following types of steel flexible metal gas
<br />piping may be used:
<br />1. Nom 2 in. (51 mm) diam (or smaller) steel flexible metal gas piping. Plastic covering on piping may
<br />or may not be removed on both sides of floor or wall assembly. OMEGA FLEX INC
<br />2. Nom 1 in. (25 mm) diam (or smaller) steel flexible metal gas piping. Plastic covering on piping may
<br />or may not be removed on both sides of floor or wall assembly. GASTITE, DIV OF TITEFLEX
<br />3. Nom 1 in. (25 mm) diam (or smaller) steel flexible metal gas piping. Plastic covering on piping may
<br />or may not be removed on both sides of floor or wall assembly. WARD MFG INC
<br />3. Fill, Void or Cavity Material* — Caulk or Sealant — Min 5/8., 1-1 /4,1-7/8 and 2-1/2 in. (16, 32, 48 and
<br />64 mm) thickness of caulk for 1, 2, 3 and 4 hr rated assemblies, respectively, applied within annulus, flush
<br />with both surfaces of wall. Min 1/4 in. (6 mm) diam bead of caulk applied to gypsum board/penetrant
<br />interface at point contact location on both sides of wall. The hourly F Rating of the firestop system is
<br />dependent upon the hourly fire rating of the wall assembly in which it is installed, as shown in the following
<br />table. The hourly T Rating of the firestop system is dependent upon the type or size of the pipe or conduit
<br />and the hourly fire rating of the wall assembly in which it is installed, as tabulated below:
<br />Max Pipe F T
<br />or Conduit Rating Rating
<br />Diam In (mm) Hr Hr
<br />1(25) 1or2 0+,1or2
<br />1 (25) 3 or 4 3 or 4
<br />4 (102) 1 or 2 0
<br />6(152) 3or40'
<br />12 (305) 1 or 2 0
<br />+When copper pipe is used, T Rating is 0 h.
<br />3M COMPANY — CP 25WB+ or FB-3000 WT.
<br />*Bearing the UL Classification Mark
<br />System No. HW-S-0001 (December 01,1999)
<br />Assembly Ratings — I & 2 Hr (See Item 3B)
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<br />1. Floor Assembly — The fire -rated fluted steel deck/concrete floor assembly shall be constructed of the
<br />materials and in the manner described in the individual Floor -Ceiling Design in the UL Fire Resistance
<br />Directory and shall include the following construction features:
<br />A. Steel Floor and Form Units* — Max 3 in. deep galv steel fluted floor units.
<br />B. Concrete — Min 2-1/2 in. thick reinforced concrete, as measured from the top plane of the floor units.
<br />IA. Roof Assembly — As an alternate to Item 1, Floor Assembly, the fire -rated roof assembly shall be
<br />constructed of the materials and in the manner described in the individual P700, P800 or P900 series Roof -
<br />Ceiling Designs in the UL Fire Resistance Directory and shall contain max 1-1/2 in. deep galv steel fluted
<br />roof units. The hourly fire rating of the roof assembly shall be equal to or greater than the hourly fire rating
<br />of the wall assembly. In the case of spray -applied protection materials on the steel roof units, the joint
<br />system shall be installed prior to the spray -applied protection material.
<br />2. Wall Assembly — The 1 or 2 hr fire -rated gypsum wallboard/steel stud wall assembly shall be constructed
<br />of the materials and in the manner described in the individual U400-Series Wall and Partition Designs in the
<br />UL Fire Resistance Directory and shall include the following construction features:
<br />A. Steel Floor And Ceiling Runners — Floor and ceiling runners of wall assembly shall consist of min 25
<br />ga galv steel channels sized to accommodate steel studs (Item 213). Ceiling runner to be provided with 1-
<br />1 /2 in. flanges. Ceiling runner secured to valleys of steel floor units (Item 1 A) with steel fasteners or by
<br />welds spaced max 12 in. OC.
<br />B. Studs — Steel studs to be min 2-1/2 in. wide. Stud spacing not to exceed 24 in. OC.
<br />C. Gypsum Board* — Wallboard sheets installed to a min total thickness of 1/2 or 1 in. on each side of
<br />wall for 1 or 2 ratings, respectively. Wall to be constructed as specified in the individual Wall and
<br />Partition Design in the UL Fire Resistance Directory. Wallboard to be butted tight to the bottom of the
<br />steel floor units.
<br />3. Joint System — The joint system consists of a forming material and a fill material in the flutes of the steel
<br />floor units, as follows:
<br />A. Forming Materials* — Min 2-1/2 in. thickness of min 4 pcf density mineral wool batt insulation firmly
<br />packed into flutes of steel floor units above ceiling runner as a permanent form. Forming material to be
<br />recessed from edges of ceiling runner on each side of wall as required to accommodate the required
<br />thickness of fill material. - Thermafiber Inc — Type SAF
<br />B. Fill, Void or Cavity Material* — Dry mix material mixed with water at a rate of 2.1 parts dry mix to 1
<br />part water, by weight, in accordance with accompanying installation instructions. A min 1/2 in.
<br />thickness of fill material installed on each side of the wall in the flutes of the steel floor units, flush with
<br />each surface of the wallboard for the 1 hr Assembly Rating. A min 1 in. thickness of fill material is
<br />required on each side of the wall for the 2 hr Assembly Rating. - US Gypsum Co — Type FC
<br />B 1. Fill, Void or Cavity Material* (Not Shown) — 2 component fill material used as an alternate to Item
<br />3B. Ready -mixed component mixed with accelerator component at a rate of 66:1 (ready -mixed
<br />component to accelerator component by weight) in accordance with the accompanying installation
<br />instructions. Applied as described in Item 3B to a min thickness of 1/2 in. for the 1 hr Assembly Rating,
<br />and to a min thickness of 1 in. for the 2 hr Assembly Rating. — US Gypsum Co — Type RFC
<br />*Bearing the UL Classification Mark
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