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Allowable Load Tables Allowable Roof Loads (plf -1.15 Load Duration Factor Table 31 -24F-1.7E (W) Southern Pine Glued Laminated Timber 3-1/8"Width 5-1/8"Width Clear Depth(in.) Depth(in.) Opening 8-1/4 1 9-5/8 1 11 1 12-3/8113-3/4115-1/8116-1/2117-7/8 11 12-3/8113-3/4115-118116-1/2117-7/8119-114120- /8 22 233/8 11 1489 1828 2205 2626 --- --- --- --- 2890 3442 4062 4763 5564 --- --- --- --- --- 6- LL 1489 1828 2205 2626 --- --- --- --- 2890 3442 4062 4763 5564 --- --- --- --- --- BL 3.0 3.0 3.0 4.5 --- --- --- --- 3.0 3.0 4.5 4.5 6.0 --- --- --- --- --- TL 976 1254 1487 1738 2009 2303 2622 2971 1948 2277 2632 3017 3436 3894 4395 4947 5557 --- 8' LL 976 1254 1487 1738 2009 2303 2622 2971 1948 2277 2632 3017 3436 3894 4395 4947 5557 --- BL 3.0 3.0 3.0 4.5 4.5 4.5 6.0 6.0 3.0 3.0 3.0 4.5 4.5 4.5 6.0 6.0 7.5 --- TL 631 852 1104 1298 1485 1684 1895 2121 1468 1699 1945 2205 2483 2778 3093 3431 3793 4183 10' LL 533 836 1104 1298 1485 1684 1895 2121 1468 1699 1945 2205 2483 2778 3093 3431 3793 4183 BL 1.5 3.0 3.0 3.0 4.5 4.5 4.5 6.0 3.0 3.0 3.0 4.5 4.5 4.5 4.5 6.0 6.0 6.0 TI, 410 595 773 972 1177 1326 1483 1648 1176 1354 1540 1736 1941 2157 2384 2623 2876 3143 12' LL 312 491 725 972 1177 1326 1483 1648 1176 1354 1540 1736 1941 2157 2384 2623 2876 3143 BL 1.5 3.0 3.0 3.0 4.5 4.5 4.5 4.5 3.0 3.0 3.0 3.0 4.5 4.5 4.5 4.5 6.0 6.0 TL 258 409 570 719 883 1063 1217 1346 935 1125 1274 1430 1592 1761 1938 2122 2314 2515 14' LL 198 312 462 652 883 1063 1217 1346 758 1073 1274 1430 1592 1761 1938 2122 2314 2515 BL 1.5 1.5 3.0 3.0 3.0 4.5 4.5 4.5 3.0 3.0 3.0 3.0 4.5 4.5 4.5 4.5 4.5 6.0 TL 172 274 408 552 679 818 969 1133 669 905 1086 1215 1349 1487 1631 1780 1934 2094 16' LL 134 211 312 441 601 793 969 1133 512 724 987 1215 1349 1487 1631 1780 1934 2094 BL 1.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 1.5 3.0 3.0 3.0 3.0 4.5 4.5 4.5 4.5 6.0 TL 119 191 286 407 537 648 769 899 469 667 881 1055 1169 1286 1407 1532 1660 1793 18- LI, 94 149 221 312 425 563 725 899 362 512 698 924 1169 1286 1407 1532 1660 1793 BL 1.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 1.5 3.0 3.0 3.0 3.0 4.5 4.5 4.5 4.5 4.5 TL 85 137 207 296 406 525 624 730 339 485 665 854 1010 1132 1236 1343 1453 1567 20' LL 69 109 162 229 312 413 533 674 265 376 512 678 875 1109 1236 1343 1453 1567 BL 1.5 1.5 1.5 1.5 3.0 3.0 3.0 4.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 4.5 4.5 4.5 TI, --- 102 154 221 304 405 516 604 252 362 498 664 830 969 1102 1196 1292 1390 22' LL --- 82 122 173 236 312 403 510 200 284 387 512 661 837 1041 1196 1292 1390 BL --- 1.5 1.5 1.5 1.5 3.0 3.0 3.0 1.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 4.5 4.5 TL --- --- 117 168 233 311 404 506 192 276 381 509 662 810 935 1069 1162 1249 24' LL --- --- 94 134 183 242 312 395 154 219 299 397 512 648 806 987 1162 1249 BI, --- --- 1.5 1.5 1.5 3.0 3.0 3.0 1.5 1.5 1.5 3.0 3.0 3.0 3.0 4.5 4.5 4.5 TL --- --- 90 131 181 243 316 402 148 214 297 398 519 660 792 906 1026 1133 26' LL --- --- 74 105 144 191 247 312 122 173 236 313 405 512 637 780 943 1128 BL --- --- 1.5 1.5 1.5 1.5 3.0 3.0 1.5 1.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 4.5 TL --- --- --- 103 143 193 252 321 --- 169 235 316 413 526 658 777 881 990 28' LL --- --- --- 84 116 153 198 251 --- 138 189 251 325 412 512 628 759 907 BL --- --- --- 1.5 1.5 1.5 3.0 3.0 --- 1.5 1.5 1.5 3.0 3.0 3.0 3.0 4.5 4.5 TL --- --- --- 82 115 155 203 259 --- 134 188 254 332 425 533 656 763 858 30' LL --- --- --- 69 94 125 162 205 --- 113 154 205 265 336 418 512 620 741 BL --- --- --- 1.5 1.5 1.5 1.5 3.0 --- 1.5 1.5 1.5 1.5 3.0 3.0 3.0 4.5 4.5 TL --- --- --- --- 93 126 165 212 --- --- 152 206 271 347 436 538 655 750 32' LL --- --- 78 103 134 169 --- --- 127 169 219 278 346 424 512 613 BL --- --- 1.5 1.5 1.5 1.5 --- --- 1.5 1.5 1.5 1.5 3.0 3.0 3.0 4.5 TL --- --- 76 103 136 175 --- --- 124 169 223 286 361 446 543 653 34' LL --- --- --- --- 65 86 112 141 --- --- 106 141 183 232 289 354 429 512 BL --- --- --- --- 1.5 1.5 1.5 1.5 --- --- 1.5 1.5 1.5 1.5 3.0 3.0 3.0 3.0 TL --- --- --- --- --- 85 112 145 --- --- --- 139 184 238 300 373 455 547 36' LL --- --- --- --- --- 73 94 119 --- --- --- 119 154 196 244 299 362 433 BL --- --- --- --- --- 1.5 1.5 1.5 --- --- --- 1.5 1.5 1.5 1.5 3.0 3.0 3.0 TL --- --- --- --- --- --- 94 121 --- --- --- --- 154 199 252 313 383 462 38' LL --- --- --- --- --- --- 80 102 --- --- --- --- 131 167 208 255 309 369 -- --- --- 1.5 1.5 --- --- --- --- 1.5 1.5 1.5 3.0 3.0 3.0 (See Requirements for Use on page 23,Key and Example on page 29,and Notes on page 29 and this page) Notes for Table 31:Allowable Roof Loads(plf)-1.15 Load Duration Factor • For practicality,allowable roof loads are omitted from the table when they exceed 3,000 and 6,000 pounds per lineal foot(pll)for the 3-1/8"and 5-1/8"-wide beams,respectively,and when a glued laminated timber's span-to-depth ratio exceeds 30. • To determine allowable roof loads for 3-and 3-1/2"-wide glued laminated timber beams,multiply tabulated total loads(TL)and live loads(LL)for 3-1/8"-wide beams by 0.96 and 1.12,respectively.Then check the required bearing length(BL). • To determine allowable roof loads for 5-and 5-1/2"-wide glued laminated timber beams,multiply the TL and LL values for 5-1/8"wide beams by 0.976 or 1.073,respectively.Then check the required bearing length(BL). 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