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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 U1traSTEEL8.
<br />1 B. 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 UltraSTEEL8.
<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 — U1traSTEEL0.
<br />2B. Steel Studs — (As an alternate to Item 2, For use with Item 5B) 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 />PS 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 />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., 518 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- 1 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 />4A. Batts and Blankets* — (Optional) —Placed in stud cavities, any glass fiber or mineral wool insulation —
<br />7. Furring Channels (Optional, not shown, for single r 1 1
<br />bearing the UL Classification Marking as to Surface Burning Characteristics and/or Fire Resistance, See Batts g ( p � �, g e o double layer systems) Resilient furring channels
<br />and Blankets (BKNV or BZJZ) Categories for names of Classified companies. fabricated from min 25 MSG corrosion -protected steel, spaced vertically a max of 24 in. OC. Flange portion
<br />5. Gypsum Board* — Gypsum panels with beveled, square or tapered edges, applied vertically or horizontally. attached to each intersecting stud with 1/2 in. long Type S-12 steel screws. Not for use with Item 5A.
<br />Vertical joints centered over studs and staggered one stud cavity on opposite sides of studs. Vertical joints in 7A. Steel Framing Members (Not Shown)* — (Optional on one or both sides, not shown, for single or double
<br />adjacent layers (multilayer systems) staggered one stud cavity. Horizontal joints need not be backed by steel layer systems) As an alternate to Item 7, furring channels and Steel Framing Members as described below:
<br />framing. Horizontal edge joints and horizontal butt joints on opposite sides of studs need not be staggered. a. Furring Channels — Formed of No. 25 MSG galv steel. 2-3/8 in. wide by 7/8 in. deep, spaced max. 24
<br />Horizontal edge joints and horizontal butt joints in adjacent layers (multilayer systems) staggered a min of 12 in. OC perpendicular to studs. Channels secured to studs as described in Item b. Gypsum board attached to
<br />in. The thickness and number of layers for the 1 hr, 2 hr, 3 hr and 4 hr ratings are as follows: 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 />Wallboard Protection on Each Side of Wall 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 />""
<br />drilling, S-12 steel screw through the center hole. Furring channels are friction fitted into clips. - PAC
<br />Min
<br />Min
<br />No. of
<br />Min
<br />International Inc — Types RSIC-1, RSIC-V.
<br />Stud
<br />Stud a
<br />Layers
<br />Thkns of
<br />7B. Steel Framing Members (Optional, Not Shown)* — As an alternate to Item 7, furring channels and Steel
<br />Depth,
<br />Depth, a
<br />& Thkns
<br />Insulation
<br />Framing Members on only one side of studs as described below:
<br />Rating
<br />Item 2
<br />Item 2A
<br />of Panel
<br />(Item 4)
<br />a. Furring Channels — Formed of No. 25 MSG gale steel, spaced 24 in. OC perpendicular to studs.
<br />1
<br />3-1/2
<br />3-5/8 '
<br />1 layer, 5/8 in. thick
<br />Optional
<br />Channels secured to studs as described in Item b. Batts and Blankets placed in stud cavity as described in
<br />u,,, ".......
<br />....... ... --- ;....... "....
<br />.... ...... « ........ w _,_....
<br />Item 5. Two layers of gypsum board attached to furring channelsas described in Item 5. Not for use with
<br />2-1/2
<br />3-5/8
<br />1 layer, 1/2 in. thick
<br />1-1/2 in
<br />Item 5A.
<br />.....�..
<br />.., ,
<br />....,... ......,,
<br />,:..,.,
<br />b. Steel Framing Members — Used to attach furring channels (Item 713a) to one side of studs (Item 2)
<br />1i
<br />1 5/8 ;
<br />3 5/8
<br />1 layer, 3/4 m thick
<br />Optional
<br />p
<br />only. Clips spaced 48 in. OC., and secured to studs with two No. 8 x 2-1/2 in. coarse drywall screws one
<br />2
<br />1-5/8
<br />2-1/2
<br />2 layers, 1/2 in. thick
<br />Optional
<br />through the hole at each end of the clip. Furring channels are friction fitted into clips. - Kinetics Noise
<br />........
<br />�::.:,
<br />"<�.... �,.�... �;........
<br />....:.........::
<br />Control Inc Type Isomax
<br />2
<br />1-5/8
<br />2-1/2 ,
<br />2 layers, 5/8 in. thick =
<br />Optional
<br />8. Joint Tape and Compound — Vinyl or casein, dry or premixed joint compound applied in two coats to
<br />w.
<br />r
<br />" "" "" "
<br />""' "
<br />joints and screw heads of outer layers. Paper tape, nom 2 in, wide, embedded in first layer of compound over
<br />2
<br />3 1 /2
<br />3 5/8
<br />:,;;;;;, :::::::, ,;;;_,; ;-;:.:::,
<br />1 layer, /4 in thick
<br />ae 3 z
<br />Y
<br />:;;,::::. ,,,:::::: :::::,;: ,;,,.,
<br />3 in .
<br />..:.,.... :_�::::.
<br />all joints of outer layer panels. Paper tape and joint compound m ou d a be omitted when sum panels are
<br />J Y p P P J p Y gypsum
<br />3
<br />1 5/8
<br />2 1/2
<br />3 layers, 1/2 in thick
<br />O tional ;
<br />p
<br />supplied with a square edge.
<br />9. Siding, Brick or Stucco — (Optional, not shown) Aluminum, vinyl or steel siding, brick veneer or
<br />3
<br />1-5/8 '
<br />2-1/2 '
<br />2layers, 3/4 in. thick
<br />Optional
<br />stucco, meeting the requirements of local code agencies, installed over gypsum panels. Brick veneer attached
<br />3
<br />1 5/8
<br />........
<br />2-1/2,
<br />3 layers, 5/8 m thick
<br />Optional
<br />to studs with corrugated metal wall ties attached to each stud with steel screws, not more than each sixth
<br />; :._:
<br />::,...,, <,: .... ,
<br />course of brick.
<br />4
<br />1-5/8
<br />2-1/2
<br />4 layers, 5/8 in. thick
<br />Optional
<br />10. Caulking and Sealants* — (Optional, not shown) A bead of acoustical sealant applied around the
<br />w -....
<br />"..... LLu.
<br />"... ...............,...
<br />-- "..--___ ....
<br />.....::.:
<br />partition perimeter for sound control. - US Gypsum Co Type AS
<br />4
<br />1 5/8
<br />2 1 /2
<br />4layers, 1 2 m thi k
<br />/ c
<br />ti n
<br />Optional al
<br />P
<br />11. Lead Batten Stri s — of Shown, For With Item
<br />p (No Use e SB) -Lead batten strips, min 1-1/2 in. wide, max 10
<br />4
<br />2-1/2
<br />2-1/2
<br />2 layers. 3/4 in. thick
<br />? in.
<br />ft longwith a max thickness of 0.125 m. Strips lac on interior
<br />ps placed o e error face of studs and attached from the
<br />excro face of the sd with two 1 �.�. long , ype12,pan head ;feel screws, sine at the top fthe strip a:d
<br />one at the bottom of the strip. Lead batten strips to have a purity of 99.9% meeting the Federal specification
<br />CANADIAN GYPSUM COMPANY 1/2 in. thick Type C, IP-X2 or IPC-AR; WRC, 5/8 in. thick Type AR, QQ-L-201f, Grade "C". Lead batten strips required behind vertical joints of lead backed gypsum wallboard
<br />C, IP-AR, IP-XI, IP-X2, IPC-AR, SCX, SHX, WRX or WRC; 3/4 in. thick Types IP-X3 or ULTRACODE (Item 5B) and optional at remaining stud locations. Required behind vertical joints.
<br />United States Gypsum CO 1/2 in. thick Type C, IP-X2, IPC-AR or WRC; 5/8 in. thick Type SCX, SHX, 12. Lead Discs or Tabs — (Not Shown, For Use With Item 513) - Used in lieu of or in addition to the lead
<br />WRX, IP-X1, AR, C, WRC, FRX-G, IP-AR, IP-X2, IPC-AR ; 3/4 in. thick Types IP-X3 or ULTRACODE batten strips (Item 11) or optional at other locations - Max 3/4 in. diam by max 0.125 in. thick lead discs
<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- compression fitted or adhered over steel screw heads or max 1/2 in. by 1-1/4 in. by max 0.125 in. thick lead
<br />AR, IP-X1, IP-X2, IPC-AR, SCX, SHX, WRX, WRC or; 3/4 in. thick Types IP-X3 or ULTRACODE 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-201 f, Grade "C".
<br />When Item 7B, 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 *Bearing the UL Classification Mark
<br />UL Details
<br />SCALE: NTS
<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 />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. (610 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 />an the hourly fire rating of the wall assembly in which it i installed,t d y g y c s as tabulated below:
<br />Max Pipe
<br />F
<br />T
<br />or Conduit
<br />Rating
<br />Rating
<br />Diam In (mm)
<br />Hr 1
<br />Hr
<br />25
<br />1( )
<br />i
<br />l 02r °
<br />0,lor 2
<br />1 (25)
<br />3 or 4=
<br />3 or 4
<br />...
<br />4 (102)
<br />„
<br />...
<br />1 or 2 1
<br />0
<br />6(152)
<br />3or4 1
<br />0
<br />12 (305)
<br />1 or 2
<br />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 —1 & 2 Hr (See Item 3B)
<br />6113')
<br />f r...r._......:- rij,}f% 1..i rf � f' r r r t
<br />.titer
<br />t
<br />5 r
<br />q, R
<br />.:..:..... � t
<br />oil
<br />..r1, '.
<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 gals 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 IA) 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 withaccompanying installation
<br />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 />B1. 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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