WIXLIB

Wood I Beam Joists GPI Series (LVL Flanges)WI Series (Lumber Flanges)All Wood I Beam joists have an enhanced OSB web.Referenced dimensions are nominal and used fordesign purposes. Not all products are available atall distribution centers; contact Georgia-Pacific forproduct availability.4Engineered Lumber Residential GuideGeorgia-Pacific Wood Products, January 2012

Greater load-carrying capacity, firmer-feeling floorsLightweight and cost effective, WIand GPI Series Wood I Beam joistsare the builder’s choice for residentialfloor and roof systems. A wideselection of sizes and flange choicesmake it easy to specify the materialsthat are right for the homes you build,whether you’re building productionhomes or custom plans.Each joist features an enhancedOSB web with high-grade solidsawn lumber or GP Lam LVLflanges. The wider flanges offeredby the 40, 60, 65, 80, and 90 seriesjoists provide broader gluing andnailing surfaces for sheathing,helping to save time and moneyfor builders. Occupants enjoy thebenefits of firm, level floors andsmooth, flat ceilings.More stable floorsWhen used as part of a flooringsystem, Wood I Beam joists canhelp floors stay quiet over time,reducing bothersome and costlycallbacks. Conventional lumber canshrink, twist and warp as the moisturefound naturally in the wood evaporates.Floors can bow, nails pull away fromthe joists, and the floor decking slidesup and down against the nails,creating annoying squeaks.In contrast, Wood I Beam joistsare more stable by design. The wideflange helps reduce vibration, creatinga firmer feeling floor. Wood I Beamjoists are produced at a lower moisture content, thereby minimizing theeffects of shrinking, twisting, andwarping.System performanceThe ultimate goal in the design of afloor or roof system is the end user’ssafety and satisfaction. Althoughjoists used at spans indicated in thisguide meet or exceed minimum codecriteria and will safely support theloads imposed on them, judgementmust be used to adequately meetuser expectation levels. Theseexpectations may vary from oneuser to another.UÊ Ê/ iÊëiV wiÀÊÃ Õ ÊV à iÀÊÌ iÊmeaning of a given deflection limitin terms of allowable deflectionand the effects this could have onthe system. For example, L/360(span/360) for a 30! span is 1" ofdeflection. L/240 would be 11 2 ,"and L/180 would be 2" of deflection.Consideration might also be givento cases in which a joist with a longspan parallels a short span or afoundation end wall. For example,a 30! span with up to 1" of allowable live load deflection could beadjacent to an end wall with nodeflection, causing a noticeabledifference in floor levels under fulldesign load.UÊ ÊA stiffer floor will result fromusing a live load deflection limitof L/480 versus the code minimumL/360. A roof system with lesstotal load deflection than the coderequired L/180 may be achievedby using an L/240 criterion.UÊ Ê Ê Ì ÊÌ Ê ÀiÊÃÌÀ }i ÌÊdeflection limits, several otherfactors may improve overall floorperformance. Reducing joist spacingand/or increasing the subfloor thickness will lessen deflection betweenadjacent joists and increase loadsharing. For increased floor stiffness,gluing the subfloor to the joists isrecommended before nailing orscrewing rather than nailing only.UÊ Ê ÃÊÜ Ì Ê ÞÊV ÃÌÀÕVÌ ]Ê ÌÊ ÃÊessential to follow proper installationprocedures. Joists must be plumband anchored securely to supportsGeorgia-Pacific Wood Products, January 2012Available depths and lengthsUÊ Ê- iÊÃiÀ iÃÊ ÀiÊ Û L iÊ Ê ii«iÀÊdepths by special order.UÊ Ê Ê ÃÌÃÊ ÀiÊ Û L iÊ ÊÛ ÕiÊlengths of 24!, 28!, 32!, 36!, 40!,44!, and 48!.UÊ Ê i }Ì ÃÊÕ«ÊÌ ÊÈä! may be specialordered.UÊ viÌ iÊ Ìi Ê7 ÀÀ ÌÞ I* See manufacturer’s warranty for terms, conditions and limitations,available at www.gp.com/build or by calling 800-284-5347.before system sheathing is attached.Supports for multiple span joistsmust be level. To minimize settlement when using hangers, joistsshould be firmly seated in thehanger bottoms. Leave a 1 16" gapbetween joist end and header.UÊ ÊVibrations may occur in floorsystems with very little dead load,as in large empty rooms. A gypsumwallboard ceiling attached to thebottom of the joists will generallydampen vibration as will interiorpartition walls running perpendicularto the joists. If a ceiling will notbe attached to the bottom of thejoists, vibration can be minimizedby nailing a continuous 2x4perpendicular to the bottom of thejoists at midspan running from endwall to end wall. Where futurefinishing of the ceiling is likely,x-bridging or Wood I Beamblocking panels may be usedin place of the 2x4.Engineered Lumber Residential Guide5

Floor Joist Maximum SpansSpanIllustrationsSimple Span(see note 4)40 PSF Live Load 10 PSF Dead LoadJoistSeriesGPI 20GPI 40GPI 65GPI 90WI 40WI 60WI 80JoistDepth91 2"117 8"14"91 2"117 8"14"117 8"14"16"117 8"14"16"91 2"117 8"14"117 8"14"16"117 8"14"16"12" "40 PSF Live Load 20 PSF Dead LoadJoistSeriesGPI 20GPI 40GPI 65GPI 90WI 40WI 60WI 80Multiple SpansJoistDepth91 2"117 8"14"91 2"117 8"14"117 8"14"16"117 8"14"16"91 2"117 8"14"117 8"14"16"117 8"14"16"12" -06"24!-11"28!-03"31!-04"Improved Performance (L/480)Spacing (Simple Span)16" o.c.19.2" gineered Lumber Residential Guide12" "Spacing (Multiple Span)16" o.c.19.2" " "Spacing (Multiple Span)16" o.c.19.2" -07"24!-08"22!-09"28!-00"24!-11"30!-00"24!-11"24" -05"18!-02"19!-11"19!-11"Improved Performance (L/480)Spacing (Simple Span)16" o.c.19.2" S:1. These span tables are based on uniform loads, as noted above; live load deflection is limitedto L/480 for better performance. Floor performance is greatly influenced by the stiffness ofthe floor joists. Experience has shown that joists designed to the code minimum live loaddeflection (L/360) will result in a floor which may not meet the expectations of some end users.Floor spans for Wood I Beam joists in accordance with those given above are stronglyrecommended, which are based on L/480 live load deflection. (One-third stiffer thanrequired by code.)2. Spans are clear distances between supports, and are based on composite action withglued-nailed APA Rated sheathing or Sturd-I-Floor panels of minimum thickness 19 32"(40/20 or 20 o.c.) for joist spacing of 19.2" or less, or 23 32" (48/24 or 24 o.c.) for a joist spacingof 24".624" "24" -10"19!-10"21!-02"21!-02"12" -00"27!-01"30!-10"34!-02"Adhesive must meet APA AFG-01 or ASTM D 3498. Apply a continuous line of adhesive(about 1 4" diameter) to top flange of joists. All surfaces must be clean and dry. If sheathingis nailed only (not recommended), reduce spans by 12".3. Minimum end bearing length is 1 3 4 ". Minimum intermediate bearing length is 31 2".4. For multiple-span joists: End spans must be at least 40% of the adjacent span. Spansshown above cover a broad range of applications. It may be possible to exceed thesespans by analyzing a specific application with FASTBeam selection software.5. For loading other than that shown above, refer to Uniform Load Tables, use FASTBeamsoftware, or contact Georgia-Pacific Engineered Lumber Technical Services.Georgia-Pacific Wood Products, January 2012

Bonus Room Floor Joist Selection !5!6!4!5!6!7!4!5!6!7!12" o.c.60-11 7 8"60-11 7 8"60-11 7 80-16"80-16"80-16"WI Joists (Series –Depth)1Spacing16" o.c.19.2" 6"60-16"80-16"60-16"80-16"80-16"80-16" 280-16"Dbl 60-16"80-16"Dbl 60-16"80-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"24" o.c.80-16" 280-16" 280-16"80-16" 3, 480-16" 380-16" 2Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 60-16"Dbl 80-16"Dbl 80-16"Dbl 80-16"Dbl 80-16"12" o.c.65-11 7 8"65-11 7 8"65-11 7 65-16"65-16"65-16"GPI Joists (Series – Depth)1Spacing16" o.c.19.2" 90-14"90-16"90-14"90-16"90-16"Dbl 65-16"90-16"Dbl 65-16"90-16"Dbl 65-16"90-16"Dbl 65-16"24" o.c.65-16" 365-16"65-16"90-16" 390-16" 290-16" 2Dbl 65-16"Dbl 65-16"Dbl 65-16"Dbl 65-16"Dbl 90-14"Dbl 90-16"Dbl 90-16"Dbl 90-16"1. Double joist (2-ply) is denoted by “Dbl”. Both joists must be glued and nailed as required for floor sheathing. No filler blocking required when top-loaded only.2. A 2 1 2 # minimum bearing length must be provided by support wall or hanger seat.3. A 3 # minimum bearing length must be provided by support wall or hanger seat.4. To be used in this application, the joist requires bearing stiffeners at both ends per detail F18.2X roof andwall framingBonus Room20 LL/10 DL20 LL /10 DL40 LL/10 DLWood I Beam Floor JoistDODOChecklocalcode forblockingrequiredat rafters.Straps for uplift and/or thrust may be required.Georgia-Pacific Wood Products, January 2012DESIGN PARAMETERS:1. Glued and nailed floor sheathing.2. Deflection limits: L/240 total load, L/480 live load,unless noted otherwise.3. Roof loads of 30 PSF live load at 115% (snow load).4. Roof dead load of 12 PSF (asphalt shingles).5. Roof rafter slope between 8/12 and 12/12.6. Kneewall weight of 40 PLF.7. Attic storage load of 20 PSF live load (outside thekneewalls).8. Floor live load of 40 PSF (between the kneewalls).9. Attic and floor dead load of 10 PSF.10. Straight gable roof framing. No hip framing ispermitted.11. For other conditions, including holes, useFASTBeam software or call Georgia-Pacificat 800-284-5347.DO NOTDo not bevel cut joistbeyond inside face of wall.Engineered Lumber Residential Guide7

Roof Joist Maximum SpansNotes:1. Roof joists to be sloped min. 1 4" in 12".No camber provided.2. Maximum deflection is limited to L/180at total load, L/240 at live load.3. Maximum slope is limited to 12" in 12"for use of these tables.4. Tables are based on the more restrictiveof simple or multiple spans.5. End spans of multiple-span joists must beat least 40% of the adjacent span.6. For other loading conditions or on-centerspacings, refer to Uniform Load Tables oruse FASTBeam selection software.7. Minimum end bearing length is 13 4".Minimum intermediate bearing lengthis 31 2".8. Spans shown below cover a broad rangeof applications. It may be possible toexceed these spans by analyzing a specificapplication using FASTBeam software.9. Tables apply to gravity loads only.10. Dead load is calculated along thejoist length.11. 20 psf non-snow live loads have beenreduced per code for slopes of over 8 /12through 12 /12.Roof Joist Maximum Spans – 115% (Snow)Refer to Notes above.Load(PSF)JoistSeriesGPI 20GPI 40GPI 65Snow115%GPI 90Live 25Dead 15WI 40WI 60WI 80GPI 20GPI 40GPI 65Snow115%GPI 90Live 30Dead 15WI 40WI 60WI 80JoistDepth91 2 "117 8"14"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"117 8"14"16"117 8"14"16"16" ope of 4/12 or less19.2" o.c.24" 26!-11"24!-11"30!-07"28!-04"34!-00"30!-08"Slope of over 4/12 through 8/1216" o.c.19.2" o.c.24" "28!-11"26!-09"34!-02"32!-01"29!-08"Slope of over 8/12 through 12/1216" o.c.19.2" o.c.24" "26!-10"24!-11"31!-09"29!-10"27!-07"Table continues on next page.8Engineered Lumber Residential GuideGeorgia-Pacific Wood Products, January 2012

Roof Joist Maximum Spans – 115% (Snow)continuedRefer to Notes on page 8.Load(PSF)JoistSeriesGPI 20GPI 40GPI 65Snow115%GPI 90Live 40Dead 15WI 40WI 60WI 80GPI 20GPI 40GPI 65Snow115%GPI 90Live 50Dead 15WI 40WI 60WI 80JoistDepth91 2 "117 8"14"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"91 2 "117 8"14"117 8"14"16"117 8"14"16"91 2 "117 8"14"117 8"14"16"117 8"14"16"16" ope of 4/12 or less19.2" o.c.24" Pacific Wood Products, January 2012Slope of over 4/12 through 8/1216" o.c.19.2" o.c.24" "25!-08"21!-06"30!-04"26!-11"21!-06"Slope of over 8/12 through 12/1216" o.c.19.2" o.c.24" "24!-00"20!-06"28!-04"25!-08"20!-06"Engineered Lumber Residential Guide9