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JamStud®

JamStud’s unique configuration delivers increased strength and stiffness versus standard “C” Shaped cold-formed steel studs. This allows for the reduction and/or elimination of  built-up jamb and header sections in curtain wall and loadbearing wall assemblies.

Features
  • Increases load capacity over a standard “C-shaped” stud of the same thickness
  • Reduces overall materials used (single “JAM” from double or triple “C-Shape” common)
  • Provides a flat surface for attachment of door or window frame (no additional track required)
  • No welding or fastening built-up members together
  • Lighter weight results in easier handling & shipping efficiencies
  • Simplified jamb and header design
  • Increased load capacity enables selection of optimal thickness of curtain wall studs
Nomenclature
JamStud Nomenclature
Material Composition
ASTM A1003/A1003M or ASTM A653/A653M, Grade 50 (340), 50ksi (340MPa) minimum yield strength, 65ksi (450 MPa) minimum tensile strength, G-60 (Z180) hot-dipped galvanized coating.
Catalogs

TSN’s Product Catalogs are an essential resource for the design of cold formed steel. Developed by Engineers, the catalogs contain design data for members, connectors, and fasteners. JamStud® can be found in the following Catalogs:

TSN Cold-Formed Steel Framing Curtain Wall Order Catalog

TSN Curtain Wall Technical Catalog

TSN Cold-Formed Steel Framing Curtain Wall Technical Catalog

TSN Curtain Wall Order Catalog

For a full list of our product catalogs, specification sections, inspection checklists, and research reports please click here.

JamStud
JamStud - Back
JamStud - Top
JamStud - Profile
JamStud
JamStud

JamStud Downloads

JamStud® Applications

 

JamStud - Header / Sill Application

Window Jams, Headers, & Sils

Installation Instructions

JamStud Design Information

JamStud Nomenclature JamStud Section Dimensions
JamStud® Product Profile
Section
(All 50 ksi)		 Overall Depth Flange Width Return Lip 1 Return Lip 2 Inside Bend Design Thickness Unit Weight
D B d1 d2 R t (lbs/ft)
(in) (in) (in) (in) (in) (in)
350JAM250-33 3.5 2.5 0.5892 0.5 0.105 0.0346 1.196
350JAM250-43 3.5 2.5 0.6102 0.5 0.105 0.0451 1.553
350JAM250-54 3.5 2.5 0.6332 0.5 0.105 0.0566 1.942
350JAM250-68 3.5 2.5 0.6626 0.5 0.105 0.0713 2.435
350JAM250-97 3.5 2.5 0.7234 0.5 0.105 0.1017 3.438
350JAM350-68 3.5 3.5 0.6626 0.5 0.105 0.0713 2.920
362JAM250-33 3.625 2.5 0.5892 0.5 0.105 0.0346 1.210
362JAM250-43 3.625 2.5 0.6102 0.5 0.105 0.0451 1.572
362JAM250-54 3.625 2.5 0.6332 0.5 0.105 0.0566 1.966
362JAM250-68 3.625 2.5 0.6626 0.5 0.105 0.0713 2.465
362JAM250-97 3.625 2.5 0.7234 0.5 0.105 0.1017 3.481
362JAM350-68 3.625 3.5 0.6626 0.5 0.105 0.0713 2.950
400JAM250-33 4 2.5 0.5892 0.5 0.105 0.0346 1.255
400JAM250-43 4 2.5 0.6102 0.5 0.105 0.0451 1.630
400JAM250-54 4 2.5 0.6332 0.5 0.105 0.0566 2.038
400JAM250-68 4 2.5 0.6626 0.5 0.105 0.0713 2.556
400JAM250-97 4 2.5 0.7234 0.5 0.105 0.1017 3.611
400JAM350-68 4 3.5 0.6626 0.5 0.105 0.0713 3.041
400JAM350-97 4 3.5 0.7234 0.5 0.105 0.1017 4.303
400JAM350-118 4 3.5 0.7684 0.5 0.105 0.1242 5.216
550JAM250-33 5.5 2.5 0.5892 0.5 0.105 0.0346 1.431
550JAM250-43 5.5 2.5 0.6102 0.5 0.105 0.0451 1.860
550JAM250-54 5.5 2.5 0.6332 0.5 0.105 0.0566 2.327
550JAM250-68 5.5 2.5 0.6626 0.5 0.105 0.0713 2.920
550JAM250-97 5.5 2.5 0.7234 0.5 0.105 0.1017 4.130
550JAM250-118 5.5 2.5 0.7684 0.5 0.105 0.1242 5.005
550JAM350-68 5.5 3.5 0.6626 0.5 0.105 0.0713 3.405
550JAM350-97 5.5 3.5 0.7234 0.5 0.105 0.1017 4.822
550JAM350-118 5.5 3.5 0.7684 0.5 0.105 0.1242 5.849
600JAM250-33 6 2.5 0.5892 0.5 0.105 0.0346 1.490
600JAM250-43 6 2.5 0.6102 0.5 0.105 0.0451 1.937
600JAM250-54 6 2.5 0.6332 0.5 0.105 0.0566 2.424
600JAM250-68 6 2.5 0.6626 0.5 0.105 0.0713 3.041
600JAM250-97 6 2.5 0.7234 0.5 0.105 0.1017 4.303
600JAM250-118 6 2.5 0.7684 0.5 0.105 0.1242 5.216
600JAM350-68 6 3.5 0.6626 0.5 0.105 0.0713 3.527
600JAM350-97 6 3.5 0.7234 0.5 0.105 0.1017 4.995
600JAM350-118 6 3.5 0.7684 0.5 0.105 0.1242 6.060
800JAM250-43 8 2.5 0.6102 0.5 0.105 0.0451 2.244
800JAM250-54 8 2.5 0.6332 0.5 0.105 0.0566 2.809
800JAM250-68 8 2.5 0.6626 0.5 0.105 0.0713 3.527
800JAM250-97 8 2.5 0.7234 0.5 0.105 0.1017 4.995
800JAM250-118 8 2.5 0.7684 0.5 0.105 0.1242 6.060
800JAM350-68 8 3.5 0.6626 0.5 0.105 0.0713 4.012
800JAM350-97 8 3.5 0.7234 0.5 0.105 0.1017 5.688
800JAM350-118 8 3.5 0.7684 0.5 0.105 0.1242 6.904

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI S100-16 Spec, Sec A3.3.2 (3).
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-16 Spec Procedure I for serviceability determination has been used.
JamStud® Section Properties: Gross Properties (for Un-punched Sections)
Section
(All 50 ksi)		 Area Ix Sx Rx Iy Ry Jx1000 Cw Ro m Xo ß
(in2) (in4) (in3) (in) (in4) (in) (in4) (in6) (in) (in) (in)
350JAM250-33 0.351 0.734 0.419 1.445 0.329 0.967 0.140 1.206 3.025 1.448 -2.476 0.330
350JAM250-43 0.456 0.945 0.540 1.439 0.424 0.964 0.309 1.565 3.017 1.445 -2.471 0.329
350JAM250-54 0.571 1.171 0.669 1.432 0.526 0.960 0.609 1.953 3.008 1.442 -2.465 0.329
350JAM250-68 0.715 1.450 0.829 1.424 0.653 0.955 1.212 2.443 2.996 1.439 -2.457 0.328
350JAM250-97 1.010 1.999 1.142 1.406 0.904 0.946 3.483 3.431 2.972 1.430 -2.441 0.325
350JAM350-68 0.858 1.870 1.068 1.476 1.471 1.309 1.454 5.401 3.980 1.965 -3.456 0.246
362JAM250-33 0.356 0.795 0.438 1.495 0.333 0.968 0.142 1.277 3.031 1.437 -2.453 0.345
362JAM250-43 0.462 1.024 0.565 1.489 0.430 0.964 0.313 1.656 3.023 1.435 -2.447 0.344
362JAM250-54 0.578 1.269 0.700 1.482 0.533 0.961 0.617 2.066 3.014 1.432 -2.442 0.344
362JAM250-68 0.724 1.573 0.868 1.474 0.662 0.956 1.227 2.583 3.002 1.428 -2.434 0.342
362JAM250-97 1.023 2.169 1.197 1.456 0.916 0.946 3.527 3.625 2.977 1.420 -2.418 0.340
362JAM350-68 0.867 2.023 1.116 1.528 1.491 1.311 1.469 5.715 3.977 1.954 -3.430 0.256
400JAM250-33 0.369 0.995 0.497 1.643 0.346 0.969 0.147 1.506 3.055 1.407 -2.386 0.390
400JAM250-43 0.479 1.283 0.641 1.637 0.446 0.965 0.325 1.951 3.046 1.404 -2.381 0.389
400JAM250-54 0.599 1.591 0.796 1.630 0.554 0.962 0.640 2.432 3.037 1.401 -2.375 0.388
400JAM250-68 0.751 1.975 0.987 1.622 0.688 0.957 1.273 3.038 3.025 1.398 -2.368 0.387
400JAM250-97 1.061 2.730 1.365 1.604 0.953 0.948 3.658 4.255 3.000 1.390 -2.352 0.386
400JAM350-68 0.894 2.525 1.263 1.681 1.547 1.316 1.514 6.736 3.976 1.922 -3.354 0.288
400JAM350-97 1.265 3.503 1.751 1.664 2.158 1.306 4.360 9.488 3.953 1.915 -3.339 0.286
400JAM350-118 1.533 4.184 2.092 1.652 2.587 1.299 7.855 11.458 3.936 1.909 -3.328 0.285
550JAM250-33 0.421 2.063 0.750 2.215 0.390 0.962 0.168 2.703 3.239 1.300 -2.158 0.556
550JAM250-43 0.547 2.667 0.970 2.209 0.503 0.959 0.371 3.497 3.230 1.297 -2.153 0.556
550JAM250-54 0.684 3.317 1.206 2.202 0.625 0.956 0.730 4.352 3.221 1.294 -2.147 0.556
550JAM250-68 0.858 4.129 1.501 2.194 0.776 0.951 1.454 5.423 3.208 1.290 -2.139 0.555
550JAM250-97 1.214 5.747 2.090 2.176 1.077 0.942 4.184 7.559 3.183 1.282 -2.123 0.555
550JAM250-118 1.471 6.881 2.502 2.163 1.285 0.935 7.538 9.058 3.163 1.275 -2.111 0.555
550JAM350-68 1.001 5.180 1.883 2.275 1.743 1.320 1.696 12.048 4.054 1.806 -3.084 0.421
550JAM350-97 1.417 7.228 2.629 2.259 2.434 1.311 4.886 16.898 4.029 1.798 -3.069 0.420
550JAM350-118 1.719 8.673 3.154 2.246 2.921 1.304 8.809 20.344 4.012 1.792 -3.057 0.419
600JAM250-33 0.438 2.522 0.841 2.400 0.402 0.958 0.175 3.209 3.326 1.269 -2.094 0.604
600JAM250-43 0.569 3.261 1.087 2.394 0.519 0.955 0.386 4.150 3.317 1.266 -2.088 0.604
600JAM250-54 0.712 4.058 1.353 2.387 0.644 0.951 0.760 5.163 3.307 1.263 -2.082 0.604
600JAM250-68 0.894 5.055 1.685 2.378 0.801 0.947 1.514 6.431 3.295 1.259 -2.074 0.604
600JAM250-97 1.265 7.047 2.349 2.361 1.111 0.937 4.360 8.956 3.269 1.250 -2.058 0.604
600JAM250-118 1.533 8.447 2.816 2.348 1.327 0.930 7.855 10.726 3.250 1.244 -2.045 0.604
600JAM350-68 1.036 6.309 2.103 2.467 1.799 1.318 1.756 14.285 4.106 1.771 -3.006 0.464
600JAM350-97 1.468 8.816 2.939 2.451 2.513 1.308 5.061 20.020 4.081 1.763 -2.990 0.463
600JAM350-118 1.781 10.588 3.529 2.438 3.017 1.302 9.127 24.090 4.063 1.757 -2.978 0.463
800JAM250-43 0.659 6.378 1.595 3.110 0.572 0.931 0.447 7.513 3.746 1.159 -1.869 0.751
800JAM250-54 0.825 7.949 1.987 3.103 0.710 0.927 0.881 9.340 3.736 1.156 -1.862 0.752
800JAM250-68 1.036 9.923 2.481 3.095 0.883 0.923 1.756 11.624 3.724 1.151 -1.854 0.752
800JAM250-97 1.468 13.893 3.473 3.076 1.225 0.914 5.061 16.161 3.698 1.142 -1.838 0.753
800JAM250-118 1.781 16.707 4.177 3.063 1.464 0.907 9.127 19.330 3.679 1.136 -1.825 0.754
800JAM350-68 1.179 12.165 3.041 3.212 1.990 1.299 1.998 25.787 4.413 1.648 -2.733 0.616
800JAM350-97 1.671 17.065 4.266 3.195 2.782 1.290 5.762 36.082 4.388 1.640 -2.717 0.617
800JAM350-118 2.029 20.553 5.138 3.183 3.341 1.283 10.398 43.367 4.370 1.633 -2.705 0.617

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI S100-16 Spec, Sec. A3.3.2 (3).
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-16 Procedure I for Serviceability Determination has been used.
JamStud® Section Properties
Section
(All 50 ksi)		 Effective Properties 50 ksi (“net” = Punched Sections) Effective Properties if limited to 33 ksi Strength
Ixe Sxe Sxe (net) Mal Mal (net) Mad Mad (net) Va Va (net) Iye1 Myal1 Myad1 Iye2 Myal2 Ixe Mal Mal (net) Mad Mad (net)
(in4) (in3) (in3) (in-k) (in-k) (in-k) (in-k) (lb) (lb) (in4) (in-k) (in-k) (in4) (in-k) (in4) (in-k) (in-k) (in-k) (in-k)
350JAM250-33 0.693 0.331 0.300 9.904 8.995 9.106 8.870 1,144 527 0.329 6.761 6.643 0.273 5.897 0.714 7.010 6.548 6.973 6.809
350JAM250-43 0.933 0.447 0.418 13.371 12.505 13.045 12.687 2,141 747 0.424 8.738 8.738 0.383 8.097 0.945 9.764 9.389 9.864 9.628
350JAM250-54 1.171 0.571 0.545 17.099 16.324 17.616 17.120 3,371 925 0.526 10.864 10.864 0.508 10.390 1.171 12.370 12.069 13.136 12.804
350JAM250-68 1.450 0.748 0.728 22.400 21.809 23.676 23.014 4,208 900 0.653 13.522 13.522 0.653 13.302 1.450 17.765 17.494 18.039 17.735
350JAM250-97 1.999 1.125 1.107 37.597 37.006 38.177 37.438 5,886 850 0.904 18.806 18.806 0.904 18.806 1.999 25.603 25.240 25.603 25.237
350JAM350-68 1.812 0.804 0.774 24.073 23.179 26.651 25.932 4,208 900 1.471 22.321 22.321 1.471 21.873 1.866 17.681 17.250 20.057 19.595
362JAM250-33 0.751 0.347 0.313 10.387 9.375 9.461 9.217 1,102 544 0.333 6.795 6.573 0.273 5.910 0.774 7.345 6.827 7.249 7.080
362JAM250-43 1.011 0.468 0.435 14.012 13.038 13.565 13.194 2,141 802 0.430 8.783 8.783 0.384 8.106 1.024 10.223 9.796 10.265 10.021
362JAM250-54 1.269 0.598 0.569 17.908 17.031 18.335 17.821 3,372 994 0.533 10.921 10.921 0.511 10.406 1.269 12.944 12.598 13.687 13.369
362JAM250-68 1.573 0.783 0.761 23.449 22.775 24.670 23.982 4,375 1,007 0.662 13.593 13.593 0.662 13.332 1.573 18.596 18.333 18.889 18.574
362JAM250-97 2.169 1.178 1.161 39.389 38.814 40.011 39.252 6,124 954 0.916 18.908 18.908 0.916 18.908 2.169 26.833 26.483 26.833 26.480
362JAM350-68 1.961 0.841 0.808 25.186 24.190 27.689 26.946 4,375 1,007 1.491 22.444 22.444 1.491 21.921 2.019 18.481 18.050 20.857 20.377
400JAM250-33 0.944 0.397 0.351 11.873 10.514 10.530 10.264 991 589 0.346 6.891 6.331 0.275 5.944 0.971 8.375 7.661 8.083 7.897
400JAM250-43 1.268 0.534 0.489 15.981 14.635 15.133 14.726 2,141 967 0.446 8.908 8.908 0.389 8.130 1.283 11.631 11.014 11.479 11.208
400JAM250-54 1.591 0.681 0.640 20.397 19.150 20.506 19.938 3,372 1,201 0.554 11.077 11.077 0.520 10.449 1.591 14.708 14.190 15.351 14.995
400JAM250-68 1.975 0.891 0.858 26.669 25.675 27.679 26.913 4,876 1,360 0.688 13.790 13.790 0.686 13.411 1.975 21.143 19.215 21.490 19.313
400JAM250-97 2.730 1.343 1.351 44.884 40.448 45.635 40.443 6,839 1,299 0.953 19.189 19.189 0.953 19.189 2.730 30.605 30.288 30.605 30.284
400JAM350-68 2.447 0.955 0.909 28.602 27.223 30.818 30.002 4,876 1,360 1.547 22.789 22.789 1.530 22.043 2.519 20.930 20.378 23.268 22.736
400JAM350-97 3.483 1.502 1.473 44.961 44.092 49.104 47.809 6,839 1,299 2.158 31.903 31.903 2.158 31.903 3.503 36.019 35.587 37.965 37.478
400JAM350-118 4.184 1.980 1.955 59.268 58.533 62.640 61.275 8,235 1,256 2.587 38.361 38.361 2.587 38.361 4.184 44.732 44.265 46.055 45.671
550JAM250-33 1.978 0.572 0.572 17.118 17.118 14.859 14.508 706 703 0.390 7.183 5.159 0.280 6.030 2.022 12.848 12.848 11.473 11.223
550JAM250-43 2.650 0.820 0.820 24.561 24.561 21.511 20.968 1,570 1,192 0.503 9.288 7.645 0.400 8.190 2.667 17.716 17.716 16.435 16.062
550JAM250-54 3.317 1.043 1.043 31.227 31.227 29.377 28.604 3,117 1,875 0.625 11.554 10.621 0.542 10.559 3.317 22.334 22.334 22.187 21.682
550JAM250-68 4.129 1.357 1.357 40.642 40.642 40.041 38.971 5,352 2,535 0.776 14.391 14.391 0.728 13.608 4.129 32.111 32.111 31.984 31.245
550JAM250-97 5.747 2.051 2.051 68.578 68.578 68.487 66.650 9,700 3,167 1.077 20.045 20.045 1.077 19.791 5.747 46.849 46.849 46.849 46.616
550JAM250-118 6.881 2.502 2.502 85.210 85.210 85.210 84.778 11,723 3,100 1.285 24.010 24.010 1.285 24.010 6.881 57.274 57.274 57.274 56.984
550JAM350-68 4.957 1.450 1.450 43.421 43.421 43.539 42.448 5,352 2,535 1.743 23.876 23.876 1.613 22.354 5.144 31.469 31.469 33.109 32.375
550JAM350-97 7.160 2.262 2.262 67.718 67.718 70.434 68.637 9,700 3,167 2.434 33.453 33.453 2.434 32.810 7.228 53.935 53.935 56.053 54.824
550JAM350-118 8.673 2.976 2.976 89.112 89.112 91.138 88.891 11,723 3,100 2.921 40.250 40.250 2.921 40.250 8.673 67.271 67.271 69.422 69.143
600JAM250-33 2.424 0.626 0.626 18.750 18.750 16.312 15.936 644 644 0.402 7.257 4.783 0.281 6.049 2.477 14.179 14.179 12.615 12.346
600JAM250-43 3.245 0.919 0.919 27.502 27.502 23.662 23.076 1,432 1,235 0.519 9.385 7.166 0.403 8.203 3.261 19.902 19.902 18.114 17.709
600JAM250-54 4.058 1.174 1.174 35.140 35.140 32.383 31.545 2,842 1,942 0.644 11.676 10.070 0.546 10.582 4.058 25.073 25.073 24.516 23.962
600JAM250-68 5.055 1.526 1.526 45.679 45.679 44.254 43.085 5,352 2,882 0.801 14.544 14.059 0.737 13.650 5.055 36.037 36.037 35.425 34.610
600JAM250-97 7.047 2.305 2.305 77.070 77.070 76.026 73.996 10,653 3,964 1.111 20.261 20.261 1.111 19.891 7.047 52.663 52.663 52.663 52.449
600JAM250-118 8.447 2.816 2.816 95.893 95.893 95.893 95.389 12,885 3,889 1.327 24.274 24.274 1.327 24.264 8.447 64.455 64.455 64.455 64.189
600JAM350-68 6.055 1.628 1.628 48.757 48.757 47.851 46.671 5,352 2,882 1.799 24.160 23.707 1.631 22.421 6.263 35.238 35.238 36.455 35.655
600JAM350-97 8.730 2.534 2.534 75.856 75.856 77.711 75.750 10,653 3,964 2.513 33.858 33.858 2.512 32.975 8.816 60.297 60.297 61.964 60.610
600JAM350-118 10.588 3.331 3.331 99.720 99.720 100.837 98.366 12,885 3,889 3.017 40.744 40.744 3.017 40.527 10.588 75.265 75.265 77.692 77.436
800JAM250-43 6.378 1.225 1.225 36.664 36.664 32.254 31.517 1,060 1,060 0.572 9.679 5.562 0.409 8.238 6.378 29.006 29.006 24.861 24.339
800JAM250-54 7.949 1.700 1.700 50.893 50.893 44.463 43.391 2,102 2,102 0.710 12.044 8.089 0.560 10.645 7.949 36.991 36.991 33.939 33.207
800JAM250-68 9.923 2.260 2.260 67.676 67.676 61.309 59.780 4,218 3,367 0.883 15.007 11.756 0.763 13.763 9.923 53.065 53.065 49.444 48.338
800JAM250-97 13.893 3.409 3.409 113.945 113.945 106.907 104.140 10,888 6,034 1.225 20.919 20.245 1.187 20.155 13.893 77.866 77.866 77.866 77.706
800JAM250-118 16.707 4.177 4.177 142.242 142.242 140.356 136.857 16,187 7,303 1.464 25.073 25.073 1.464 24.681 16.707 95.609 95.609 95.609 95.410
800JAM350-68 11.805 2.406 2.406 72.028 72.028 65.370 63.855 4,218 3,367 1.990 25.049 19.995 1.681 22.600 12.120 51.562 51.562 50.106 49.055
800JAM350-97 16.974 3.711 3.711 111.105 111.105 107.517 104.925 10,888 6,034 2.782 35.121 34.452 2.645 33.415 17.065 87.651 87.651 86.268 84.422
800JAM350-118 20.553 4.855 4.855 145.369 145.369 140.775 137.426 16,187 7,303 3.341 42.281 42.281 3.337 41.240 20.553 109.593 109.593 112.929 110.637

1 Iye, Myal, and Myad are based on the web element in tension
2 Iye, Myal, and Myad are based on the web element in compression

Notes:

  1. Effective properties incorporate the strength increase from the cold-work of forming as applicable per AISI S100-16 Spec, Sec. A3.3.2 (3).
  2. Tabulated gross properties are based on the full-unreduced cross section of the studs, away from punchouts.
  3. Allowable moment is the lesser of Mal and Mad. Stud distortional buckling is based on an assumed kΦ = 0.
  4. For deflection calculations, use the effective moment of inertia.
  5. The effective moment of inertia for deflection is calculated at a stress which results in a section modulus such that the stress times the section modulus at that stress is equal to the allowable moment. AISI S100-16 Procedure I for Serviceability Determination has been used.

JamStud Design Example

1. Basis for Tables:

The JamStud® allowable heights tables on this site cover the following basic load combination for strength determination using the Allowable Stress Design (ASD) Method (IBC 2009/2012 and ASCE 7-05/10):

  • D + WC&C  (ASCE 7-05)
  • D + 0.6WC&C  (ASCE 7-10)

WC&C is the component & cladding wind load. The Dead Load (D) acting on the stud is assumed minimum and therefore neglected in the tables.

For deflection determination IBC 2009 and IBC 2012-Sec. 1604.3 and AISI-S211-07 Wall Stud Design Standard Sec. A3.1 allow for a reduction factor of 0.7 on the component & cladding wind load (0.7WC&C).

The “JamStud® – Allowable Heights” tables are based on the following assumptions:

  • 4-Way distribution of lateral wind pressure acting on the opening
  • Opening height extends from floor level to the bottom surface of the header
  • Jamb member supports wind pressure from opening, wind pressure from half distance to adjacent stud, and header reaction

The input for the tables include: the JamStud section, the opening width (ft.), the opening height (ft.), the design wind pressure (WC&C, psf), and the specified deflection limit. The output from the tables reflects the allowable JamStud height (ft.-in.) and the controlling design factor, whether it is strength or deflection (“f” denotes strength, “d” denotes deflection). An “*” denotes critical web crippling at support of jamb. The use of stiffening clips at supports typically eliminates the web crippling condition.

2. Design Example:

Given:

Wind Pressure (WC&C)(ASCE 7-05)       
or (0.6WC&C)(ASCE 7-10)                      = 30 psf
Wall Width                                                  = 6.0 in.
Wall Height                                                 = 14.0 ft.
Opening Width                                           = 8.0 ft.
Opening Height                                          = 10.0 ft.
Stud Spacing                                               = 16 in. o.c.
Specified Deflection Limit                       = L/360
Typical Stud                                                600S162-43

Bridging (Lateral Bracing) is recommended at a vertical spacing of 60” o.c. with both JamStud flanges connected to the sheathing.

Design Jamb:

Go to the “JamStud – Allowable Heights” table with 6” stud member, 30 psf wind load, L/360 deflection limit, 8.0 ft. opening width, and 10.0 ft. opening height. Possible JamStud selections from table for 14.0 ft. height are 600JAM250-97 (allowable height = 15’ 0”) and 600JAM350-68 (allowable height = 14’ 6”). The alternative with typical 43mil “cee” studs result in a built-up section comprised of (3) 600S162-43 capped by (2) 600T162-43.

Conclusion:

The second option, 600JAM350-68, is a lighter section with a lesser thickness. Use 600JAM350-68 (50ksi) (with design thickness = 0.0713” and Fy = 50 ksi). Allow 2 rows of bridging for the wall (including jamb stud) arranged so that the maximum spacing does not exceed 60 in. (5 ft.).

3. Extra Design Considerations:

Strength determination in the “JamStud – Allowable Heights” tables includes checks for bending and shear capacity values of the stud and a check for lateral end reaction of the stud for web crippling. If tables indicate critical web crippling (denoted with an “*”), you may use a clip at the top and bottom ends of stud to eliminate the web crippling condition.

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