T e c h n i c a l n o T e Sprinkler Pipe Installation for APA Performance Rated I-Joists Number J745 June 2009 APA Performance Rated wood I-joists (PRI) are often used in conjunction with both steel and chlorinated polyvinyl chloride (CPVC) sprinkler systems. The purpose of this technical note is to provide some basic guidance on appro- priate methods of attachment of steel and CPVC sprinkler systems to PRI joists. All designs should be checked by a design professional to assure the adequacy of not only the hangers and fasteners used but the capacity of the I-joists themselves. When CPVC sprinkler systems are used, it is the responsibility of the designer to ensure the pipe and fittings are listed by a listing agency for I-joist systems in accordance with NFPA 13. Design examples in this technical note are based on the assumptions outlined below. Permitted Fasteners Chapter 9 of the National Fire Protection Association (NFPA) 13, Standard for the Installation of Sprinkler Systems, lists the approved fasteners for use in wood and other materials. NFPA 13R, Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and Including Four Stories in Height, requires pipe hanging and bracing methods complying with NFPA 13. NFPA 13D, Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, requires only that pipes supported by structural members be supported by methods comparable to those required by local plumbing codes. Check local code. Design Load Assumptions The design information in Tables A-F is provided for the selection and sizing of structural members and connections for the support of the sprinkler system. The capacity information given in the figures, unless otherwise specified, is based on the 2009 Automatic Sprinkler Systems Handbook, NFPA 13, and is based on an assumed maximum span between pipe supports as shown in Table A for Schedule 40 steel pipe or Table B for Schedule 80 CPVC pipe perma- nently filled with water. An additional allowance is made for a short-term additional load of 250 pound attachments. See NFPA 13 for spans with other types and diameters of piping. A duration-of-load factor of 0.9 is used for perma- nent loads, and 1.6 is used for the short-term loads and for seismic loads in the bracing designs. For seismic loads Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 2 on bracing, spacing of braces depends on pipe size and length of pipe runs and the seismic design category. I-joist flanges are assumed to be 1-1/2 inches thick. All filler blocking attached to webs is assumed to be nominal 2x No. 2 Spruce-Pine-Fir (SPF) or better. Design Fastener Capacities For installations in lumber or into I-joist flanges, lag screw, wood screw and bolt design assumptions are based on the use of AF&PA National Design Specification (NDS-2005) design methods and design capacities for Spruce-Pine-Fir No. 2 with a specific gravity (SG) of 0.42. Sheet metal screws are assumed to have the same bearing strength and with- drawal capacity per threaded inch as wood screws. Oriented strand board (OSB) webs are assumed to be 3/8 inch thick with a design specific gravity of 0.50 per Table 11.3.2B of NDS or APA Panel Design Specification, Form D510, available at www.apawood.org/publications. All filler blocking attached to webs is assumed to be nominal 2x SPF lumber. Joist Design Most wood I-joist design tables are based on an assumed uniform load. Joists and other supporting systems must be designed to carry the added weight of the sprinkler system. This may necessitate the use of deeper I-joists, joists with shorter spans, closer spacing and/or a different I-joist series with higher moment and stiffness capacities or a flange. Coach Screw Rods and Lag Screws NFPA 13 limits the use of coach screws. This precludes the direct attachment of coach screw rods to the flanges of most wood I-joists. Lag screws are permitted; however, the designer must remain aware that only the threaded por- tion is used for design and that the full length of the lag screw is not threaded (see NDS Table L2 for dimensions). While fastener penetration into the edges of the I-joist webs is permissible (through the flange face), it is recom- mended that web-edge penetration not be added to the withdrawal-from-flange-face value. Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI)  FIGURE 1 FIGURE 2 APA PERFORMANCE RATED I-JOIST – APA PERFORMANCE RATED I-JOIST – CEILING FLANGE HANGER COACH SCREW HANGER Ceiling flange minimum No. 2 SPF or better filler block bearing on flange required 2 screws Fastener when supporting steel pipe. Orient horizontal or vertical. centerline Minimum 6" length 2x4 from web face 1/2" maximum Coach Screw Rod 3/8" maximum diameter 3" min. Sheet metal screw: Two - #10 x 1-1/2" Nail option: Two - clinched Install per NFPA 13. 8d (0.113" x 2-1/2") Install per NFPA 13 and manufacturer’s instructions. Steel sprinkler system pipe Steel sprinkler system pipe 4" maximum diameter or 4" maximum diameter or 500 pounds maximum point load 500 pounds maximum point load FIGURE 3 FIGURE 4 APA PERFORMANCE RATED I-JOIST – APA PERFORMANCE RATED I-JOIST – JOIST CLAMP HANGER ANGLE BRACKET HANGER Joist clamp hanger per No. 2 SPF or better filler block bearing on flange required manufacturer’s specifications when supporting steel pipe. Orient horizontal or vertical. re: dimension and capacity Minimum 6" length 2x4 Eye rod Sheet metal screw: Two - #10 x 1-1/2" Nail option: Install per NFPA 13. Two - clinched 8d Install per NFPA 13 and manufacturer’s instructions. Steel sprinkler system pipe (0.113" x 2-1/2") Steel sprinkler system pipe 4" maximum diameter or 4" maximum diameter or 500 pounds maximum point load 500 pounds maximum point load Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 4 FIGURE 5 FIGURE 6 APA PERFORMANCE RATED I-JOIST – APA PERFORMANCE RATED I-JOIST – OFFSET EYE-SOCKET HANGER EYE ROD HANGER No. 2 SPF or better filler block bearing on flange required No. 2 SPF or better filler block bearing on flange required when supporting steel pipe. Orient horizontal or vertical. when supporting steel pipe. Orient horizontal or vertical. Minimum 6" length 2x4 Minimum 6" length 2x4 Sheet metal Sheet metal screw: Two - #10 x 1-1/2" screw: Two - #10 x 1-1/2" Nail option: Two - clinched Nail option: Two - clinched 8d (0.113" x 2-1/2") 8d (0.113" x 2-1/2") Install per NFPA 13 and manufacturer’s instructions. Install per NFPA 13. Steel sprinkler system pipe 4" maximum diameter or Steel sprinkler system pipe 4" maximum diameter or 500 pounds maximum point load 500 pounds maximum point load FIGURE 7 APA PERFORMANCE RATED I-JOIST – LOAD CARRIED BY FLANGES Sheet metal screw: Two - #10 x 1-1/2" Nail option: Two - 8d (0.113" x 2-1/2") Center fastener vertically on hanger block No. 2 SPF or better hanger block bearing on flange required when supporting steel pipe. Install - 48" maximum length 2x4 for 3" maximum diameter = 475 pounds maximum point load Install - 48" maximum length 2x6 for 5" maximum Install per NFPA 13 and manufacturer’s instructions. diameter = 600 pounds maximum point load Steel sprinkler system pipe. See note to left. Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 5 FIGURE 8 APA PERFORMANCE RATED I-JOIST – NFPA 13 STEEL ANGLE TRAPEZE WITH HANGER Slave piece orient horizontal Option 1 Option 2 12" min. length 2x4 Install per NFPA 13. Install per NFPA 13. Sheet metal screws: CPVC sprinkler system pipe Steel sprinkler system pipe Two - #14 x 2" 2-1/2" maximum diameter = 4" maximum diameter = 290 pounds maximum point 500 pounds maximum point load (145 pounds per joist) load (250 pounds per joist) Center hanger location not required Install 48" maximum Lag Screw: One - 1/4 x 3" Sheet metal screw length NFPA 13 angle iron Sheet metal screw option: One - #14 x 3" option: One - #14 x 3" Centerline from web Centerline from web face 1/2" maximum face 3/4" maximum Slave piece orient horizontal. 12" minimum length 2x4. Sheet metal screws: Two - #14 x 3" FIGURE 9 FIGURE 10 APA PERFORMANCE RATED I-JOIST – APA PERFORMANCE RATED I-JOIST – CPVC HANGER - SURFACE MOUNT CPVC HANGER - OFFSET Option 1 Option 2 Option 1 Option 2 Backing nuts Sheet metal screw: Backing nuts Sheet metal screw: Four - #10 x 1-1/2" Four - #10 x 1-1/2" Nail option: Nail option: Four - clinched 8d Four - clinched 8d (0.113" x 2-1/2") (0.113" x 2-1/2") Install per NFPA 13 and No. 2 SPF or Install per NFPA 13 and No. 2 SPF or manufacturer’s instructions. better filler block manufacturer’s instructions. better filler block CPVC sprinkler system pipe bearing on flange CPVC sprinkler system pipe bearing on flange 3" maximum diameter or 310 ok, but not required. 3" maximum diameter or 310 ok, but not required. pounds maximum point load Minimum 6" length 2x4 pounds maximum point load Minimum 6" length 2x4 Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI)  FIGURE 11 FIGURE 12 APA PERFORMANCE RATED I-JOIST – APA PERFORMANCE RATED I-JOIST – CPVC HANGER - SURFACE MOUNT CPVC HANGER - DOUBLE OFFSET No. 2 SPF or No. 2 SPF or better filler block better filler block bearing on flange bearing on flange ok, but not required. ok, but not required. Minimum 6" Minimum 6" length 2x4 length 2x4 Sheet metal screw: Sheet metal screw: Four - #10 x 1-1/2" Four - #10 x 1-1/2" Nail option: Four - clinched Nail option: Four - clinched 8d (0.113" x 2-1/2") 8d (0.113" x 2-1/2") Install per NFPA 13 and manufacturer’s instructions. Install per NFPA 13 and manufacturer’s instructions. CPVC sprinkler system pipe 3" maximum diameter or CPVC sprinkler system pipe 3" maximum diameter or 310 pounds maximum point load 310 pounds maximum point load FIGURE 13 APA PERFORMANCE RATED I-JOIST – CPVC HANGER - FACE MOUNT Option 1 Option 2 No. 2 SPF or 2x4 hanger block better filler block bearing on flange bearing on flange or bearing on secured ok, but not required 4" minimum length 2x4 48" maximum block bearing on flange length 2x6 Sheet metal screw each Sheet metal screw: end: Two - #10 x 1-1/2" Four - #10 x 2" Nail option each end: Center hanger Nail option each end 1/2" stagger: Two - 8d (0.113" x 2-1/2" location not required Six - 10d (0.148" x 3") Install per NFPA 13 and manufacturer’s instructions. CPVC sprinkler system pipe 3" maximum diameter or 0.500 310 pounds maximum point load (155 pounds per joist) Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 7 FIGURE 14 APA PERFORMANCE RATED I-JOIST – SWAY BRACE BLOCKING FOR SEISMIC LOADS PARALLEL TO THE JOIST Option 1 Blocking Option 2 Blocking on one side on both 4D 4D of web sides of web 4D 7D 4D No. 2 SPF or better filler and slave block No. 2 SPF or better filler and slave block 4D bearing on flange ok, but not required. bearing on flange ok, but not required. Install both sides minimum 12" long 2x6 Install both sides minimum 12" long 2x6 Sheet metal screw through web into block: Eight - #10 x 1-1/2" Sheet metal screw each side: Eight - #14 x 3" Lag option though web into block: Eight - 1/4" x 1-1/2" Lag option each side: Eight - 1/4" x 3" Nail option through web into block: Ten - clinched 10d Nail option each side: Ten - clinched 12d (0.128" x 3-1/4") To find horizontal capacity (0.128" x 3") 30°–44° from vertical – divide by 2 45°–59° from vertical – divide by 1.414 Install per NFPA 13 and manufacturer’s instructions. Install per NFPA 13 and manufacturer’s instructions. 60°–89° from vertical – divide by 1.155 Maximum horizontal load = 650 pounds includes a Maximum horizontal load = 1000 pounds includes a 90° from vertical – divide by 1 1.33 duration of load adjustment 1.33 duration of load adjustment Example: blocking mounted to web with 4-3/8" bolts plus one 3/8" bolt for mounting bracket, angle = 30°, 635�1.414 = 449 lb *D = Nominal bolt diameter (in.) FIGURE 15 APA PERFORMANCE RATED I-JOIST – SWAY BRACE BLOCKING FOR SEISMIC LOADS PERPENDICULAR TO THE JOIST Lag screw: Three - 1/4" x 2" Allowable load: lb/brace Angle to Vertical* Lag screw through side: Three - 1/4" x 3" 30° 45° 60° 90° 230 325 395 460 Loads are based on the controlling connection to Install sway brace bolt at joists and sheathing. minimum 4D from any edge Install per NFPA 13 and manufacturer’s instructions. The capacity of the brace No. 2 SPF or better brace blocking Install one - 48" Maximum load = 585 pounds fastener to the wood block maximum length 4x6 against webs and under upper flanges includes a 1.33 duration of may limit the capacity of load adjustment (243 pounds per joist) the detail. (See NFPA 13.) Loads include a 1.33 duration of load (DOL) adjustment. FIGURE 16 APA PERFORMANCE RATED I-JOIST – SWAY BRACE BLOCKING FOR SEISMIC LOADS PERPENDICULAR TO THE JOIST Cross member lag screws: Allowable load: lb/brace Four - 1/4" x 3" each end Sheet metal screw: Angle to Vertical* Web blocking lag screws: Four - #14 x 3" each end 30° 45° 60° 90° Four - 1/4" x 2" each end Nail option: Six - 12d Sheet metal screws: 230 325 395 460 (0.128" x 3-1/4") each end Four - #14 x 1-1/2" each end Loads are based on the Install sway brace bolt at controlling connection to minimum 4D from any edge joists and sheathing. The capacity of the brace No. 2 SPF or better brace blocking Install per NFPA 13 and fastener to the wood block Install one - full length vertical 2x4 flat on manufacturer’s instructions. may limit the capacity of each web between top and bottom flanges Maximum load = 515 pounds the detail. (See NFPA 13.) Install one - 48" maximum length horizontal includes a 1.33 duration of load 2x6 against webs and under upper flanges adjustment (258 pounds per joist) Loads include a 1.33 duration of load (DOL) adjustment. Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI)  FIGURE 17 APA PERFORMANCE RATED I-JOIST – SWAY BRACE BLOCKING FOR SEISMIC LOADS PERPENDICULAR TO THE JOIST Sheet metal screw: Four - #14 x 2" 3/8" minimum 24/0 Span Allowable load: lb/brace Nail option: Five - clinched 8d (0.113” x 2-1/2”) Rating wood structure panel Angle to Vertical* Nail option: 8d common Panel nail pattern 30° 45° 60° 90° (0.131" x 2 1/2") spaced 3" 3" on center typical on center into web blocking 230 325 395 460 8d common (0.131" x 2-1/2") Sheet metal screw: Loads are based on the controlling connection to Two - #14 x 3" joists and sheathing. The capacity of the brace Install sway brace bolt at fastener to the wood block minimum 4D from any edge may limit the capacity of the detail. (See NFPA 13.) No. 2 SPF or better brace blocking Install one - full length vertical 2x4 flat on Install per NFPA 13 and Loads include a 1.33 each web between top and bottom flanges manufacturer’s instructions. duration of load (DOL) Install one - 24" maximum length horizontal 2x6 Maximum load = 515 pounds includes adjustment. against webs and above or on lower flanges a 1.33 duration of load adjustment (258 pounds per joist) FIGURE 18 FIGURE 19 APA PERFORMANCE RATED I-JOIST – END AND EDGE DISTANCES, LOADED AND UNLOADED CPVC HANGER IN WEB BORE Loaded edge distance Allowable load: lb/brace End Spacing distance Angle to Vertical* between 30° 45° 60° 90° bolts in Install per NFPA 13 and 230 325 395 460 a row manufacturer’s instructions. Loads are based on the CPVC Sprinkler system pipe controlling connection to 3" maximum diameter or Unloaded joists and sheathing. 310 pounds maximum point load Spacing between edge distance rows of bolts The capacity of the brace fastener to the wood block may limit the capacity of the detail. (See NFPA 13.) Loads include a 1.33 duration of load (DOL) adjustment. FIGURE 20 MAIN AND SIDE MEMBERS Main member – the last member/members penetrated by the fastener. Side member – the first member penetrated by the fastener Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 9 TABLE A stEEL schEduLE 40 PiPE sizEs, sPans and wEights for structuraL dEsign hanger Load at Max. conc. Load Max. dist. spacing: 1x (Pipe(b) requirement per short-term nominal size Between hangers(a) Plus water) x 1.15 hanger for design(c) design Load(c) (in.) (ft) (lb/hanger) (lb) (lb per hanger) 1 12 27 250 277 1-1/4 12 49 250 299 1-1/2 15 0 250 10 2 15 5 250 5 2-1/2 15 12 250 2  15 10 250 40 -1/2 15 21 250 41 4 15 21 250 51 5 15 402 250 52  15 544 250 794 (d) 15  250 111 (a) Maximum distance between hangers: NFPA 1. (b) Pipe weights: NFPA 1 per Automatic Sprinkler System Handbook, (c) For design-capacity requirements: NFPA 1, (1 x weight of water-filled pipe PLUS 250 lb). (d) Schedule 0 pipe. TABLE B cPVc schEduLE 80 PiPE sizEs, sPans and wEights for structuraL dEsign Max. dist. hanger Load conc. Load Between at Max. spacing: requirement per short-term design hangers(a) 1x (Pipe Plus water) hanger for design(b) Load(b), nominal size (in.) (ft) (lb/hanger) (lb) (lb per hanger) /4 5-1/2 15 250 25 1  2 250 27 1-1/4 -1/2 44 250 294 1-1/2 7 250 11 2  10 250 5 2-1/2 9 17 250 42  10 25 250 55 (a) Maximum distance between hangers: NFPA 1. (b) For design-capacity requirements: NFPA 1 (1 x weight of water-filled pipe PLUS 250 lb). TABLE C MiniMuM EdgE distancE: Lag scrEws and BoLts in 1-1/2" LuMBEr(a) Lag screw and Minimum End distance Minimum End distance Minimum Edge distance Minimum Edge distance Bolt diameter(a) Parallel to grain Parallel to grain: Perpendicular to grain: Perpendicular to grain: (in.) unloaded Edge (in.) 4d Loaded Edge (in.) 7d Loaded Edge (in.) 4d unloaded Edge (in.) 1.5d / 1-1/2 2-5/ 1-1/2 5/ 1/2 2 -1/2 2 /4 (a) NDS, Section 11.5. (b) Reducing distance to ends and edges is permissable provided that the geometry factor, C , is applied to calculated design capacity (NDS 11.5).  Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org Sprinkler Pipe Installation for APA Performance Rated I-Joists (PRI) 10 TABLE D TABLE E Load caPacity: fastEnErs with 3/8" osB sidE MEMBErs(a) Load caPacity: fastEnErs with Penetration into side grain 1/8" stEEL sidE MEMBEr(a) of Main Member Main Member Lag screw withdrawal thickness Lateral Load capacity(b) (lb) diameter(a),(c) capacity(d) Lateral Load (in.) Main 1-1/2", side 3/8" (lb) Lag screw capacity(b) (lb) 1/4 x 2 75 211 diameter(c) (in.) 1-1/2" (2" Lag) 5/1 x 2 91 24 1/4 112 / x 2 77 271 / 97 Main Member thickness Bolt Bolt diameter(a) single shear double shear(e) diameter(a) (in.) 1-1/2" (in.) 1-1/2" Main 3/8", side 1-1/2" 1/4 124 1/4  109 5/1 140 5/1 109 1 / 155 / 127 1 1/2 1 1/2 149 21 5/ 207 wood screw sheet Metal withdrawal screw wood screw(c) screw(c) Lateral Load capacity (lb) capacity(d) withdrawal size no. 1-1/2" size no. Main 1-1/2", side 7/8" (lb) capacity  x 2 9 (1")  x 2"  0 124 10 x 2 11 (1") 10 x 2" 7 9 14 12 x 2 142 12 x 2" 97 79 9 14 x 2 154 14 x 2" 10  109 (a) NDS Section 11..1. (a) NDS Section 11..1. See Figure 20. (b) Side Member 1/" ASTM 4 Steel; SG Main Member = 0.42; DOL = 1.0; Load (b) Side Member /" OSB (SG = 0.50); Main Member 1-1/2" SPF lumber Perpendicular to Grain; Single Shear. (SG = 0.42); DOL = 1.0; Load Perpendicular to Grain; Single Shear. (c) Multiply tabulated capacity by C = 0.7, (c) Multiply tabulated capacity by C = 0.7, when fastener is in end grain. eg eg when fastener is in end grain. (d) Full length of lag screws and wood screws is not threaded. Minimum penetration required for lag (e) OSB main member in double shear. screws is 4 times bolt diameter. Form No. J745 ■ © 2009 APA – The Engineered Wood Association ■ www.apawood.org