TABLE F- 2
FLOOR JOISTS WITH L/360 DEFLECTION LIMITS
DESIGN CRITERIA:
Deflection - For 40 psf live load.
Limited to span in inches divided by 360.
Strength - Live load of 40 psf plus dead load
of 10 psf determines the required bending design value.
Joist
Size Spacing
(in) (in) Modulus of Elasticity, E, in 1,000,000 psi
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4
12.0 8- 6 8-10 9- 2 9- 6 9- 9 10- 0 10- 3 10- 6 10- 9 10-11 11- 2 11- 4 11- 7 11- 9 11-11 12- 1 12- 3
16.0 7- 9 8- 0 8- 4 8- 7 8-10 9- 1 9- 4 9- 6 9- 9 9-11 10- 2 10- 4 10- 6 10- 8 10-10 11- 0 11- 2
2x 6 19.2 7- 3 7- 7 7-10 8- 1 8- 4 8- 7 8- 9 9- 0 9- 2 9- 4 9- 6 9- 8 9-10 10- 0 10- 2 10- 4 10- 6
24.0 6- 9 7- 0 7- 3 7- 6 7- 9 7-11 8- 2 8- 4 8- 6 8- 8 8-10 9- 0 9- 2 9- 4 9- 6 9- 7 9- 9
12.0 11- 3 11- 8 12- 1 12- 6 12-10 13- 2 13- 6 13-10 14- 2 14- 5 14- 8 15- 0 15- 3 15- 6 15- 9 15-11 16- 2
16.0 10- 2 10- 7 11- 0 11- 4 11- 8 12- 0 12- 3 12- 7 12-10 13- 1 13- 4 13- 7 13-10 14- 1 14- 3 14- 6 14- 8
2x 8 19.2 9- 7 10- 0 10- 4 10- 8 11- 0 11- 3 11- 7 11-10 12- 1 12- 4 12- 7 12-10 13- 0 13- 3 13- 5 13- 8 13-10
24.0 8-11 9- 3 9- 7 9-11 10- 2 10- 6 10- 9 11- 0 11- 3 11- 5 11- 8 11-11 12- 1 12- 3 12- 6 12- 8 12-10
12.0 14- 4 14-11 15- 5 15-11 16- 5 16-10 17- 3 17- 8 18- 0 18- 5 18- 9 19- 1 19- 5 19- 9 20- 1 20- 4 20- 8
16.0 13- 0 13- 6 14- 0 14- 6 14-11 15- 3 15- 8 16- 0 16- 5 16- 9 17- 0 17- 4 17- 8 17-11 18- 3 18- 6 18- 9
2x10 19.2 12- 3 12- 9 13- 2 13- 7 14- 0 14- 5 14- 9 15- 1 15- 5 15- 9 16- 0 16- 4 16- 7 16-11 17- 2 17- 5 17- 8
24.0 11- 4 11-10 12- 3 12- 8 13- 0 13- 4 13- 8 14- 0 14- 4 14- 7 14-11 15- 2 15- 5 15- 8 15-11 16- 2 16- 5
12.0 17- 5 18- 1 18- 9 19- 4 19-11 20- 6 21- 0 21- 6 21-11 22- 5 22-10 23- 3 23- 7 24- 0 24- 5 24- 9 25- 1
16.0 15-10 16- 5 17- 0 17- 7 18- 1 18- 7 19- 1 19- 6 19-11 20- 4 20- 9 21- 1 21- 6 21-10 22- 2 22- 6 22-10
2x12 19.2 14-11 15- 6 16- 0 16- 7 17- 0 17- 6 17-11 18- 4 18- 9 19- 2 19- 6 19-10 20- 2 20- 6 20-10 21- 2 21- 6
24.0 13-10 14- 4 14-11 15- 4 15-10 16- 3 16- 8 17- 0 17- 5 17- 9 18- 1 18- 5 18- 9 19- 1 19- 4 19- 8 19-11
Fb 12.0 718 777 833 888 941 993 1043 1092 1140 1187 1233 1278 1323
1367 1410 1452 1494
Fb 16.0 790 855 917 977 1036
1093 1148 1202 1255 1306 1357 1407 1456 1504
1551 1598 1644
Fb 19.2 840 909 975 1039 1101
1161 1220 1277 1333 1388 1442 1495 1547 1598
1649 1698 1747
Fb 24.0 905 979 1050 1119 1186
1251 1314 1376 1436 1496 1554 1611 1667 1722
1776 1829 1882
Note: The required bending design value, Fb, in pounds per square inch is shown at the bottom of each table and is applicable to all lumber sizes shown. Spans are shown in feet-inches and are limited to 26‵ and less. Check sources of supply for availability of lumber in lengths greater than 20‵.
TABLE C-1
CEILING JOISTS WITH L/240 DEFLECTION LIMITS
DESIGN CRITERIA:
Deflection - For 10 psf live load.
Limited to span in inches divided by 240.
Strength - Live Load of 10 psf plus
dead load of 5 psf determines the required fiber stress value.
Joist
Size Spacing
(in) (in) Modulus of Elasticity, E, in 1,000,000 psi
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4
12.0 9-10 10- 3 10- 7 10-11 11- 3 11- 7 11-10 12- 2 12- 5 12- 8 12-11 13- 2 13- 4 13- 7 13- 9 14- 0 14- 2
16.0 8-11 9- 4 9- 8 9-11 10- 3 10- 6 10- 9 11- 0 11- 3 11- 6 11- 9 11-11 12- 2 12- 4 12- 6 12- 9 12-11
2x 4 19.2 8- 5 8- 9 9- 1 9- 4 9- 8 9-11 10- 2 10- 4 10- 7 10-10 11- 0 11- 3 11- 5 11- 7 11- 9 12- 0 12- 2
24.0 7-10 8- 1 8- 5 8- 8 8-11 9- 2 9- 5 9- 8 9-10 10- 0 10- 3 10- 5 10- 7 10- 9 10-11 11- 1 11- 3
12.0 15- 6 16- 1 16- 8 17- 2 17- 8 18- 2 18- 8 19- 1 19- 6 19-11 20- 3 20- 8 21- 0 21- 4 21- 8 22- 0 22- 4
16.0 14- 1 14- 7 15- 2 15- 7 16- 1 16- 6 16-11 17- 4 17- 8 18- 1 18- 5 18- 9 19- 1 19- 5 19- 8 20- 0 20- 3
2x 6 19.2 13- 3 13- 9 14- 3 14- 8 15- 2 15- 7 15-11 16- 4 16- 8 17- 0 17- 4 17- 8 17-11 18- 3 18- 6 18-10 19- 1
24.0 12- 3 12- 9 13- 3 13- 8 14- 1 14- 5 14- 9 15- 2 15- 6 15- 9 16- 1 16- 4 16- 8 16-11 17- 2 17- 5 17- 8
12.0 20- 5 21- 2 21-11 22- 8 23- 4 24- 0 24- 7 25- 2 25- 8
16.0 18- 6 19- 3 19-11 20- 7 21- 2 21- 9 22- 4 22-10 23- 4 23-10 24- 3 24- 8 25- 2 25- 7 25-11
2x 8 19.2 17- 5 18- 1 18- 9 19- 5 19-11 20- 6 21- 0 21- 6 21-11 22- 5 22-10 23- 3 23- 8 24- 0 24- 5 24- 9 25- 2
24.0 16- 2 16-10 17- 5 18- 0 18- 6 19- 0 19- 6 19-11 20- 5 20-10 21- 2 21- 7 21-11 22- 4 22- 8 23- 0 23- 4
12.0 26- 0
16.0 23- 8 24- 7 25- 5
2x10 19.2 22- 3 23- 1 23-11 24- 9 25- 5
24.0 20- 8 21- 6 22- 3 22-11 23- 8 24- 3 24-10 25- 5 26- 0
Fb 12.0 711 769 825 880 932 983 1033 1082 1129 1176 1221 1266 1310
1354 1396 1438 1480
Fb 16.0 783 847 909 968 1026
1082 1137 1191 1243 1294 1344 1394 1442 1490
1537 1583 1629
Fb 19.2 832 900 965 1029 1090
1150 1208 1265 1321 1375 1429 1481 1533 1583
1633 1682 1731
Fb 24.0 896 969 1040 1108 1174
1239 1302 1363 1423 1481 1539 1595 1651 1706
1759 1812 1864
Note: The required bending design value, Fb, in pounds per square inch is shown at the bottom of each table and is applicable to all lumber sizes shown. Spans are shown in feet-inches and are limited to 26‵ and less. Check sources of supply for availability of lumber in lengths greater than 20‵.
TABLE C-2
CEILING JOISTS WITH L/240 DEFLECTION LIMITS
DESIGN CRITERIA:
Deflection - For 20 psf live load.
Limited to span in inches divided by 240.
Strength - Live Load of 20 psf plus
dead load of 10 psf determines the required bending design value.
Size Spacing
(in) (in) Joist Modulus of Elasticity, E, in 1,000,000 psi
0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4
12.0 7-10 8- 1 8- 5 8- 8 8-11 9- 2 9- 5 9- 8 9-10 10- 0 10- 3 10- 5 10- 7 10- 9 10-11 11- 1 11- 3
16.0 7- 1 7- 5 7- 8 7-11 8- 1 8- 4 8- 7 8- 9 8-11 9- 1 9- 4 9- 6 9- 8 9- 9 9-11 10- 1 10- 3
2x 4 19.2 6- 8 6-11 7- 2 7- 5 7- 8 7-10 8- 1 8- 3 8- 5 8- 7 8- 9 8-11 9- 1 9- 3 9- 4 9- 6 9- 8
24.0 6- 2 6- 5 6- 8 6-11 7- 1 7- 3 7- 6 7- 8 7-10 8- 0 8- 1 8- 3 8- 5 8- 7 8- 8 8-10 8-11
12.0 12- 3 12- 9 13- 3 13- 8 14- 1 14- 5 14- 9 15- 2 15- 6 15- 9 16- 1 16- 4 16- 8 16-11 17- 2 17- 5 17- 8
16.0 11- 2 11- 7 12- 0 12- 5 12- 9 13- 1 13- 5 13- 9 14- 1 14- 4 14- 7 14-11 15- 2 15- 5 15- 7 15-10 16- 1
2x 6 19.2 10- 6 10-11 11- 4 11- 8 12- 0 12- 4 12- 8 12-11 13- 3 13- 6 13- 9 14- 0 14- 3 14- 6 14- 8 14-11 15- 2
24.0 9- 9 10- 2 10- 6 10-10 11- 2 11- 5 11- 9 12- 0 12- 3 12- 6 12- 9 13- 0 13- 3 13- 5 13- 8 13-10 14- 1
12.0 16- 2 16-10 17- 5 18- 0 18- 6 19- 0 19- 6 19-11 20- 5 20-10 21- 2 21- 7 21-11 22- 4 22- 8 23- 0 23- 4
16.0 14- 8 15- 3 15-10 16- 4 16-10 17- 3 17- 9 18- 1 18- 6 18-11 19- 3 19- 7 19-11 20- 3 20- 7 20-11 21- 2
2x 8 19.2 13-10 14- 5 14-11 15- 5 15-10 16- 3 16- 8 17- 1 17- 5 17- 9 18- 1 18- 5 18- 9 19- 1 19- 5 19- 8 19-11
24.0 12-10 13- 4 13-10 14- 3 14- 8 15- 1 15- 6 15-10 16- 2 16- 6 16-10 17- 2 17- 5 17- 9 18- 0 18- 3 18- 6