Floor Truss Span Tables - Southern Components, Inc.

1 Floor Truss span Tables17 Alpine Engineered ProductsThese allowable spans are based on NDS 91. Maximumdeflection is limited by L/360 or L/480 under live load. BasicLumber Design Values are F =2000 psi F =1100 psiF =2000 psi E=1,800,000 psi Duration Of Load = of trusses are center to center (in inches). Top ChordDead Load = 10 psf. Bottom Chord Dead Load = 5 Line Chase = 24" max. Trusses must be designed forany special loading, such as concentrated loads. Other floorand roof loading conditions, a variety of species and otherlumber grades are (b)(t)(c)CenterDeflectionTruss DepthTruss DepthSpacingLimitL/36022'2"24'11" 26'10"28'8"30'4"31'11"19'0"20'9"22'4"23' 10"25'3"26'7"L/48020'2"22'7"24'11"27'2"2 9'4"31'5"18'0"20'2"22"4'23'10"25'3"26'7" L/36020'9"22'8"24'4"26'0"27'6"29'0"17'3" 18'9"20'3"21'7"22'10" 24'1"L/48018'11"21'3"23'6"25'7"27'6"29'0 "16'11"18'9"20'3"21'7"22'10" 24'1"L/36018'5"20'1"21'7"23'1"24'5"25'9" 15'2"16'7"17'10"19'1"20'2"21'3"L/48017'7 "19'9"21'7"23'1"24'5"25'9"15'2"16'7"17'1 0"19'1"20'2"21'3"L/36019'4"21'4"23'0"24' 6"26'0"27'4"16'3"17'9"19'2"20'5"21'8"22' 9"L/48017'7"19'9"21'10"23'9"25'8"27'4"15 '9"17'8"19'2"20'5"21'8"22'9"L/36017'9"19 '4"20'10"22'3"23'7"24'10"14'9"16'1"17'4" 18'6"19'7"20'7"L/48016'7"18'7"20'6"22'3" 23'7"24'10"14'9"16'1"17'4"18'6"19'7"20'7 "L/36015'9"17'2"18'6"19'9"20'11"22'0"13' 0"14'2"15'3"16'4"17'3"18'2"L/48015'4"17' 2"18'6"19'9"20'11"22'0"13'0"14'2"15'3"16 '4"17'3"18'2"L/36016'11"18'6"19'11"21'3" 22'6"23'8"14'1"15'5"16'7"17'8"18'9"19'9" L/48015'8"17'7"19'5"21'2"22'6"23'8"14'0" 15'5"16'7"17'8"18'9"19'9"L/36015'4"16'9" 18'1"19'3"20'5"21'6"12'9"13'11"15'0"16'0 "16'11" 17'10"L/48014'9"16'6"18'1"19'3"20'5"21'6 "12'9"13'11"15'0"16'0"16'11"

2 17'10"L/36013'8"14'10"16'0"17'1"18'1"19' 1"11'3"12'3"13'3"14'1"14'11"15'9"L/48013 '8"14'10"16'0"17'1"18'1"19'1"11'3"12'3"1 3'3"14'1"14'11"15'9"12"14"16"18"20"22"12 "14"16"18"20"22"16" " " "14"16"18"20"22"12"14"16"18"20"22"16" " " "14"16"18"20"22"12"14"16"18"20"22"16" " " (1) Vibration Control -- Research by Virginia Tech indicates thatL/480 live load deflection criteria provides a high degree ofresistance to Floor vibration (bounce). The building designerdesiring this benefit may choose to specify an L/480 live loaddeflection criteria to be used for the Floor PSF Live Load55 PSF Total Load85 PSF Live Load100 PSF Total Load60 PSF Live Load75 PSF Total Load40 PSF Live Load55 PSF Total Load85 PSF Live Load100 PSF Total Load60 PSF Live Load75 PSF Total Load4x2 Lumber3x2 Lumber3/"122/"121/"121/"12 Framing With Trusses: Floors18 Encyclopedia Of TrussesMaximum duct dimensions are based on a Truss plate width of 4 inches. Larger plate widthscause a reduction in duct sizes.

3 Chase sizes are maximum possible for centered Openings For Fan Style Floor Trusses With 4x2 or 3x2 Chords & WebsAll Dimensions In InchesDepthPanelSizeABCDEFG106041/241/41 141/21647116051/451/41251/21558117/86073 /463/41061/41451/283/4126061/461/4146205 9136071/471/4127181/2610146081/481/41772 2611156091/481/2158256121660101/491/2149 276131860121/4101/2141/2101/226715206014 111/2141/21226817226016121/2151330819246 018131/2161432821266019141/2181534823306 022162017321024366025171/222191/2361024 DepthPanelSizeABCDEFG91/23651/241/2831/2 10361/2117/86073/463/41061/41451/283/411 7/85473/461/21061/41451/283/4125473/463/ 41061/21453/49135483/471/212716610145493 /481371/41663/4111554101/281/21473/41771 /4121654111/291/41581/41873/413185413101 /41691/22081/4152054141/2111/417101/2228 1/217225416121811249192454171/2132012269 1/221 Panel SizeABCDEFGD epthTypical Duct Opening Sizes For 4x2 Fan Style Floor TrussesAll Dimensions In InchesTypical Duct Opening Sizes For 3x2 Fan Style Floor Trusses