Dhla Roof adfasdfRafter

DAVID H. LAU AND ASSOCIATES, INC. 12467 West Washington Boulevard Los Angeles, CA 90066-5511 email: [email protected] JOB_________________ SHEET NO._______OF______ CALCULATED BY____________ DATE____________ Fb= 875 psi Dead Load = 14 psf Fv= 95 psi Live Load = 20 psf E= 1.6E+6 psi Duration Factor = 1.25 2x10 @ 24" ROOF RAFTER/JOIST DHL/SM/NRG Revised 02-05-08 Dead Load Live Load plf plf At 12 " o.c. 14.00 20.00 At 16 " o.c. 18.67 26.67 At 24 " o.c. 28.00 40.00 At 48 " o.c. 56.00 80.00 Joist Spacing S Joist in3 12" o.c. 16" o.c. 24" o.c. 48" o.c. 2x4 5.36 12.33 10.68 8.72 6.16 2x6 7.56 14.64 12.68 10.35 7.32 2x8 13.14 18.00 15.59 12.73 9.00 2x10 21.39 22.97 19.89 16.24 11.48 2x12 31.64 27.93 24.19 19.75 13.97 Allowable Bending Sress Fb=1450 psi x 1.15 Max. Span Deflection = L / 240 For w = Dead Load / 2 + Live Load Joist I in4 12" o.c. 16" o.c. 24" o.c. 48" o.c. 2x4 5.36 8.88 8.07 7.05 5.60 2x6 20.8 13.95 12.68 11.08 8.80 2x8 47.6 18.38 16.71 14.60 11.59 2x10 99 23 46 21 32 18 63 14 79 Max. Span 2x10 99 23.46 21.32 18.63 14.79 2x12 178 28.52 25.92 22.64 17.98 Deflection = L / 360 For w = Live Load I Joist in4 12" o.c. 16" o.c. 24" o.c. 48" o.c. 2x4 5.36 8.58 7.79 6.81 2x6 20.8 13.47 12.24 10.70 8.49 Max. Span 2x6 20.8 13.47 12.24 10.70 8.49 2x8 47.6 17.75 16.13 14.09 11.19 2x10 99 22.65 20.58 17.98 14.28 2x12 178 27.54 25.02 21.86 17.36 Roof Joist/Rafter Max. Span = 15.00 ft Use 2x10 @ 24.00 M All bl S 16 24 ft Max. Allowable Span = 16.24 ft DHL/SM/NRG Revised 02-05-08

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Transcript of Dhla Roof adfasdfRafter

DAVID H. LAU AND ASSOCIATES, INC.12467 West Washington BoulevardLos Angeles, CA 90066-5511email: [email protected]

JOB_________________SHEET NO._______OF______

CALCULATED BY____________DATE____________

Fb= 875 psi Dead Load = 14 psfFv= 95 psi Live Load = 20 psfE= 1.6E+6 psi Duration Factor = 1.25

2x10 @ 24" ROOF RAFTER/JOIST

DHL/SM/NRG Revised 02-05-08

Dead Load Live Loadplf plf

At 12 " o.c. 14.00 20.00At 16 " o.c. 18.67 26.67At 24 " o.c. 28.00 40.00At 48 " o.c. 56.00 80.00

Joist Spacing

SJoist in3 12" o.c. 16" o.c. 24" o.c. 48" o.c.2x4 5.36 12.33 10.68 8.72 6.162x6 7.56 14.64 12.68 10.35 7.322x8 13.14 18.00 15.59 12.73 9.002x10 21.39 22.97 19.89 16.24 11.482x12 31.64 27.93 24.19 19.75 13.97

Allowable Bending Sress Fb=1450 psi x 1.15 Max. Span

Deflection = L / 240 For w = Dead Load / 2 + Live LoadJoist I

in4 12" o.c. 16" o.c. 24" o.c. 48" o.c.2x4 5.36 8.88 8.07 7.05 5.602x6 20.8 13.95 12.68 11.08 8.802x8 47.6 18.38 16.71 14.60 11.592x10 99 23 46 21 32 18 63 14 79

Max. Span

2x10 99 23.46 21.32 18.63 14.792x12 178 28.52 25.92 22.64 17.98

Deflection = L / 360 For w = Live LoadI

Joist in4 12" o.c. 16" o.c. 24" o.c. 48" o.c.2x4 5.36 8.58 7.79 6.812x6 20.8 13.47 12.24 10.70 8.49

Max. Span

2x6 20.8 13.47 12.24 10.70 8.492x8 47.6 17.75 16.13 14.09 11.192x10 99 22.65 20.58 17.98 14.282x12 178 27.54 25.02 21.86 17.36

Roof Joist/RafterMax. Span = 15.00 ftUse 2x10 @ 24.00

M All bl S 16 24 ftMax. Allowable Span = 16.24 ft

DHL/SM/NRG Revised 02-05-08