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18 SPACE (1-1/8") RIVETED STEEL GRATING LOAD TABLE
<br />Use this table when evaluating spans and loads of the following types of steel grating: 18-R-7, 18-R-3.5
<br />Bearing
<br />Bar Size(inches)
<br />Approx. Weight psf *
<br />Maximum
<br />Pedestrian Span**
<br />Unsupported Span
<br />2'-0 2'-6 3'-0 3'-6 4'-0 4'-6 5'-0 5'-6 6'-0 6'-6 7'-0 8'-0
<br />3/4 x 3/16 7.8 4'-0"
<br />U 613 392 272 200 153 121 98
<br />D 0.099 0.155 0.223 0.304 0.397 0.503 0.621
<br />C 613 490 409 350 306 272 245
<br />D 0.079 0.124 0.179 0.243 0.318 0.402 0.497
<br />1 x 1/8 7.6 4'-5"
<br />U 726 465 323 237 182 144 116
<br />D 0.074 0.116 0.168 0.228 0.298 0.377 0.466
<br />C 726 581 484 415 363 323 291
<br />D 0.060 0.093 0.134 0.182 0.238 0.302 0.372
<br />1 x 3/16 9.4 4'-11"
<br />U 1,090 697 484 356 272 215 174 144
<br />D 0.074 0.116 0.168 0.228 0.298 0.377 0.466 0.563
<br />C 1,090 872 726 623 545 484 436 396
<br />D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451
<br />1-1/4 x 1/8 8.7 5'-3"
<br />U 1,135 726 504 371 284 224 182 150 126
<br />D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451 0.536
<br />C 1,135 908 757 649 567 504 454 413 378
<br />D 0.048 0.074 0.107 0.146 0.191 0.241 0.298 0.360 0.429
<br />1-1/4 x 3/16 11.0 5'-10"
<br />U 1,702 1,090 757 556 426 336 272 225 189 161
<br />D 0.060 0.093 0.134 0.182 0.238 0.302 0.372 0.451 0.536 0.629
<br />C 1,702 1,362 1,135 973 851 757 681 619 567 524
<br />D 0.048 0.074 0.107 0.146 0.191 0.241 0.298 0.360 0.429 0.504
<br />1-1/2 x 1/8 9.9 6'-0"
<br />U 1,634 1,046 726 534 409 323 262 216 182 155 133 102
<br />D 0.050 0.078 0.112 0.152 0.199 0.251 0.310 0.376 0.447 0.524 0.608 0.794
<br />C 1,634 1,307 1,090 934 817 726 654 594 545 503 467 409
<br />D 0.040 0.062 0.089 0.122 0.159 0.201 0.248 0.300 0.358 0.420 0.487 0.636
<br />1-1/2 x 3/16 12.5 6'-8"
<br />U 2,451 1,569 1,090 800 613 484 392 324 272 232 200 153
<br />D 0.050 0.078 0.112 0.152 0.199 0.251 0.310 0.376 0.447 0.524 0.608 0.794
<br />C 2,451 1,961 1,634 1,401 1,226 1,090 981 891 817 754 700 613
<br />D 0.040 0.062 0.089 0.122 0.159 0.201 0.248 0.300 0.358 0.420 0.487 0.636
<br />1-3/4 x 3/16 14.2 7'-6"
<br />U 3,337 2,135 1,483 1,090 834 659 534 441 371 316 272 209
<br />D 0.043 0.067 0.096 0.130 0.170 0.215 0.266 0.322 0.383 0.450 0.521 0.681
<br />C 3,337 2,669 2,224 1,907 1,668 1,483 1,335 1,213 1,112 1,027 953 834
<br />D 0.034 0.053 0.077 0.104 0.136 0.172 0.213 0.257 0.306 0.360 0.417 0.545
<br />2 x 3/16 16.8 8'-3"
<br />U 4,358 2,789 1,937 1,423 1,090 861 697 576 484 413 356 272
<br />D 0.037 0.058 0.084 0.114 0.149 0.189 0.233 0.282 0.335 0.393 0.456 0.596
<br />C 4,358 3,486 2,905 2,490 2,179 1,937 1,743 1,585 1,453 1,341 1,245 1,090
<br />D 0.030 0.047 0.067 0.091 0.119 0.151 0.186 0.225 0.268 0.315 0.365 0.477
<br />2-1/4 x 3/16 18.3 9'-0"
<br />U 5,515 3,530 2,451 1,801 1,379 1,090 883 729 613 522 450 345
<br />D 0.033 0.052 0.074 0.101 0.132 0.168 0.207 0.250 0.298 0.350 0.406 0.530
<br />C 5,515 4,412 3,677 3,152 2,758 2,451 2,206 2,006 1,839 1,697 1,576 1,379
<br />D 0.026 0.041 0.060 0.081 0.106 0.134 0.166 0.200 0.238 0.280 0.324 0.424
<br />2-1/2 x 3/16 19.9 9'-9"
<br />U 6,809 4,358 3,026 2,223 1,702 1,345 1,090 900 757 645 556 426
<br />D 0.030 0.047 0.067 0.091 0.119 0.151 0.186 0.225 0.268 0.315 0.365 0.477
<br />C 6,809 5,447 4,540 3,891 3,405 3,026 2,724 2,476 2,270 2,095 1,946 1,702
<br />D 0.024 0.037 0.054 0.073 0.095 0.121 0.149 0.180 0.215 0.252 0.292 0.381
<br />* Weight per square foot based upon rivets spaced at 7" on center. Add .40 psf for 3-1/2" rivet centers.
<br />** Maximum pedestrian load is defined as a 100# uniform load with deflection ≤ 1/4 inch. The 1/4" maximum deflection criteria is considered consistent with pedestrian
<br /> comfort, but may be exceeded for other loading conditions at the discretion of the specifying authority.
<br />All loads and deflections are theoretical and based upon
<br />the gross sections of the bearing bars, using a fiber
<br />stress of 18,000 psi.
<br />The values are not intended to be absolute since the
<br />actual load capacity will be affected by the slight
<br />variations in mill and manufacturing tolerances.
<br />Grating for spans to the left of the heavy line have a
<br />deflection ≤ 1/4" for uniform loads of 100 psf.
<br />U = uniform load in pounds/sq. ft.C = concentrated load in pounds/ft. of grating widthD = deflection in inches
<br />Page 17 of 44
<br />3201 S Halladay St
<br />5/5/2025
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