## International Residential Code 2009 (IRC 2009)

#### Appendix Q Discontinuous Footing Detail for Garage or Porch Walls Foundation Wall Extension Detail

Heads up: There are no amended sections in this chapter.

# Appendix N Basic Load Estimating

AMENDMENT
This section has been amended at the state or city level.
For SI: 1 inch = 25.4, 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
ASSUMPTIONS (sleeping area live load; roof or stick frame rafters with no interior bearing):

 Loads in Section A - A as follows: Total Loads (in pounds/linear foot) 2nd floor load = = Interior wall load = wall weight per square foot x wall height = LOAD/linear foot 8 pounds/sq. ft. x 8ft. = 64 pounds/linear foot (Wall weight can vary. Verify actual weight of materials used.) Attic load = = Roof load: No roof load is transmitted to the beam in the family room. Roof load = 0
Total Load on Beam in Family Room = 834 pounds/1 foot.

Beam span in family room is 9 feet and total estimated load is 834 pounds/linear foot:
By using Table No. N-1, the required beam is 4 @ 2 x 12 SPF
OR
By using Table No. N-2, the required minimum flitch beam is 2 @ 2 x 8 with 5/8" x 7" steel plate bolted with 1/2" bolts spaced at 2' o.c.

EXAMPLE OF LOAD ESTIMATING ON BEAM IN NOOK AREA
 Loads in Section B-B as follows: Total Loads (in pounds/linear foot) 2nd floor load = = Exterior wall load = wall weight per square foot x wall height = LOAD/linear foot = 8 pounds/sq. ft. × 8ft. = 64 pounds/linear foot (Wall weight can vary. Verify actual weight of materials used.) Attic load = = Roof load = = Nook ceiling load = = Nook roof load = =
Total Load on Beam in Nook = 884 pounds/1 ft.
Beam span in nook is 8 feet and total estimated load is 884 pounds/linear foot.
By using Table No. N-1, the required beam is 4 @ 2 x 12 x Southern pine, or 4 @ 2 x 12 Spruce-pine-fir
OR

 2 x 8 (11/2 x 71/4) SPAN L6(feet) SPRUCE-PINE-FIR5 SOUTHERN PINE 2 ply 3 ply 4 ply 2 ply 3 ply 4 ply 3 1305 1956 2610 1692 2538 3383 4 979 1468 1958 1013 1519 2026 5 736 1104 1472 648 972 1296 6 511 767 1022 450 675 900 7 375 563 751 331 496 661 8 287 431 575 253 380 506 9 227 341 545 200 300 400 10 184 276 368 162 243 324 12 114 172 228 113 169 225 14 72 108 144 72 108 144 2 x 10 (11/2 x 91/4) SPAN L6(feet) SPRUCE-PINE-FIR5 SOUTHERN PINE 2 ply 3 ply 4 ply 2 ply 3 ply 4 ply 3 1665 2498 3330 2158 3238 4317 4 1249 1873 2498 1426 2139 2852 5 999 1499 1998 913 1369 1825 6 763 1144 1525 634 951 1268 7 560 840 1120 466 698 931 8 429 643 858 357 535 713 9 339 508 678 282 423 563 10 275 412 549 228 342 456 12 191 286 381 158 238 317 14 140 210 280 116 175 233 2 x 12 (11/2 x 111/4) SPAN L6(feet) SPRUCE-PINE-FIR5 SOUTHERN PINE 2 ply 3 ply 4 ply 2 ply 3 ply 4 ply 3 2025 3038 4050 2625 3938 5250 4 1519 2278 3038 1969 2953 3938 5 1215 1823 2430 1266 1898 2531 6 1013 1519 2025 879 1318 1756 7 753 1130 1507 646 969 1291 8 577 856 1154 494 742 989 9 456 684 911 391 586 781 10 369 554 738 316 475 633 12 256 385 513 220 330 439 14 188 283 377 161 242 323
For SI: 1 foot = 304.8 mm.
1. Lumber grade is #2 intended for an in-service moisture content of 19 percent or less.
2. Deflection is limited to L/360.
3. Load duration factor used in calculations is 1.0.
4. Bearing and lateral support for the member shall be provided. Support for the member ends shall provide a continuous load path from the bearing to the foundation.
5. Values tabulated are for Spruce-Pine-Fir, not Spruce-Pine-Fir (South). Values tabulated for Southern Pine are based on design values published by the American Wood Council in an addendum to NDS dated March 2013.
6. Span L is clear span. Effective span for bending and deflection is clear span plus 3 inches.

 (2) 2 x 6 with Plate Indicated SPAN L6(feet) PLATE SIZE / (Beam Weight per Foot) 1/4" x 5" Plate (8 lb./ft.) 3/8" x 5" Plate (10 lb./ft.) 1/2" x 5" Plate (13 lb./ft.) 5/8" x 5" Plate (15 lb./ft.) 3/4" x 5" Plate (17 lb./ft.) 6'-0" 643 825 1006 1188 1370 7'-0" 473 606 739 873 1006 8'-0" 362 464 566 668 771 9'-0" 272 348 425 502 579 10'-0" 198 254 310 366 422 11'-0" 149 191 233 275 317 12'-0" 115 147 179 212 244 (2) 2 x 8 with Plate Indicated SPAN L6(feet) PLATE SIZE / (Beam Weight per Foot) 1/4" x 7" Plate (11 lb./ft.) 3/8" x 7" Plate (14 lb./ft.) 1/2" x 7" Plate (17 lb./ft.) 5/8" x 7" Plate (20 lb./ft.) 3/4" x 7" Plate (23 lb./ft.) 6'-0" 1150 1499 1849 2199 2549 7'-0" 845 1102 1359 1615 1872 8'-0" 647 843 1040 1237 1434 9'-0" 511 666 822 977 1133 10'-0" 414 540 666 792 917 11'-0" 342 446 550 654 758 12'-0" 287 375 462 550 637 13'-0" 230 300 369 439 509 14'-0" 184 240 296 352 408 15'-0" 150 195 240 286 331 16'-0" 123 161 198 236 273

 (2) 2 x 10 with Plate Indicated SPAN L6(feet) PLATE SIZE / (Beam Weight per Foot) 1/4" x 9" Plate (14 lb./ft.) 3/8" x 9" Plate (18 lb./ft.) 1/2" x 9" Plate (22 lb./ft.) 5/8" x 9" Plate (26 lb./ft.) 3/4" x 9" Plate (30 lb./ft.) 6'-0" 1642 2145 2649 3153 3657 7'-0" 1206 1576 1946 2317 2687 8'-0" 923 1207 1490 1774 2057 9'-0" 730 954 1177 1401 1625 10'-0" 591 772 954 1135 1317 11'-0" 488 638 788 938 1088 12'-0" 410 536 662 788 914 13'-0" 350 457 564 672 779 14'-0" 302 394 487 579 672 15'-0" 263 343 424 504 585 16'-0" 231 302 373 443 514 17'-0" 204 267 330 393 456 18'-0" 182 238 294 350 406 19'-0" 155 203 250 298 345 20'-0" 133 174 214 255 296

(continued)

 (2) 2 x 12 with Plate Indicated SPAN L6(feet) Plate Size / (Beam Weight per Foot) 1/4" x 11" Plate (18 lb./ft.) 3/8" x 11" Plate (22 lb./ft.) 1/2" x 11" Plate (27 lb./ft.) 5/8" x 11" Plate (32 lb./ft.) 3/4" x 11" Plate (36 lb./ft.) 6'-0" 2297 3006 3715 4425 5134 7'-0" 1688 2209 2730 3251 3772 8'-0" 1292 1691 2090 2489 2888 9'-0" 1021 1336 1651 1966 2282 10'-0" 827 1082 1338 1593 1848 11'-0" 683 894 1105 1316 1527 12'-0" 574 752 929 1106 1283 13'-0" 489 640 791 943 1094 14'-0" 422 552 682 813 943 15'-0" 367 481 594 708 821 16'-0" 323 423 522 622 722 17'-0" 286 374 463 551 639 18'-0" 255 334 413 492 570 19'-0" 229 300 371 441 512 20'-0" 207 271 334 398 462 21'-0" 188 245 303 361 419 22'-0" 171 224 276 329 382 23'-0" 156 205 253 301 349 24'-0" 140 183 226 269 312
For SI: 1 foot = 304.8 mm.
1. Lumber species and grade is #2 Southern Pine intended for an in-service moisture content of 19 percent or less. Design values used were published by the American Wood Council in an addendum to NDS dated March 2013. For Spruce-Pine-Fir lumber using the tabulated flitch plate allowable loads will be slightly conservative.
2. Tabulated values are based on ASTM A36 structural steel plate.
3. Deflection is limited to L/360.
4. Load duration factor used in calculations is 1.0.
5. Bearing and lateral support for the member shall be provided. Support for the member ends shall provide a continuous load path from the bearing to the foundation.
6. Span L is center to center of supports. Wood side plates and steel flitch plates shall be continuous throughout the span.