DAVID H. LAU AND ASSOCIATES, INC.12467 West Washington BoulevardLos Angeles, CA 90066-5511email: DHLAssoc@aol.com

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