U = safe uniform load (psf)
C = safe concentrated load (psf)
D = deflection in inches
E = modulus of elasticity, 29,000,000 (psi)
F = fiber stress, 18,000 (psi)

Material: ASTM-A-1011 standard

Deflection: Spans and loads to the right of the bold line exceed 1/4″ deflection for uniform load of 100 psf which provides safe pedestrian comport. These can be exceeded for other types of loads with engineer’s approval.

Serrated Bars: For serrated grating, the depth of grating required for a specified load is 1/4″deeper than that shown in the table.

LOAD & DEFLECTION TABLE:
Loads and deflections are theoretical and based on static loading.
Bar SizeSymbol# per sfSec. Mod per ft. of width
SAFE SPAN Direction of Bearing Bar)
2′-02′-63′-03′-64′-04′-65′-0
3/4″ x 1/8″ Non-Serrated Only15W44.70.15U
D		450
0.099		288
0.155		200
0.223		147
0.304		113
0.397		89
0.503
15P4
15P2		5.1
6.1		C
D		450
0.079		360
0.124		300
0.179		257
0.243		225
0.318		200
0.402
3/4″ x 3/16″ Non-Serrated Only15W46.90.23U
D		675
0.099		432
0.155		300
0.223		220
0.304		169
0.397		133
0.503		108
0.621
15P4
15P2		7.7
9.1		C
D		675
0.079		540
0.124		450
0.179		386
0.243		338
0.318		300
0.402		270
0.497
5′-66′-0
1″ x 1/8″15W4
15W2		6.1
6.7		0.27U
D		800
0.074		512
0.116		356
0.168		261
0.228		200
0.298		158
0.377		128
0.466		106
0.563		89
0.670
15P4
15P2		6.5
7.5		C
D		800
0.060		640
0.093		533
0.134		457
0.182		400
0.238		356
0.302		320
0.372		291
0.451		267
0.536
1″ x 3/16″15W4
15W2		8.9
9.6		0.4U
D		1200
0.074		768
0.116		533
0.168		392
0.228		300
0.298		237
0.377		192
0.466		159
0.563		133
0.670
15P4
15P2		9.8
11.2		C
D		1200
0.060		960
0.093		800
0.134		686
0.182		600
0.238		533
0.302		480
0.372		436
0.451		400
0.536
6′-67′-0
1-1/4″ x 1/8″15W4
15W2		7.5
8.1		0.42U
D		1250
0.060		800
0.093		556
0.134		408
0.182		313
0.238		247
0.302		200
0.372		165
0.451		139
0.536		118
0.629		102
0.730
15P4
15P2		8.2
9.5		C
D		1250
0.048		1000
0.074		833
0.107		714
0.146		625
0.191		556
0.241		500
0.298		455
0.360		417
0.429		385
0.504		357
0.584
1-1/4″ x 3/16″15W4
15W2		11.0
11.6		0.63U
D		1875
0.060		1200
0.093		833
0.134		612
0.182		469
0.238		370
0.302		300
0.372		248
0.451		208
0.536		178
0.629		153
0.730
15P4
15P2		12.3
14.2		C
D		1875
0.048		1500
0.074		1250
0.107		1071
0.146		938
0.191		833
0.241		750
0.298		682
0.360		625
0.429		577
0.504		536
0.584
8′-09′-0
1-1/2″ x 1/8″15W4
15W2		8.9
9.4		0.6U
D		1800
0.050		1152
0.078		800
0.112		588
0.152		450
0.199		365
0.251		288
0.310		238
0.376		200
0.447		170
0.524		147
0.608		113
0.794		89
1.006
15P4
15P2		9.6
10.9		C
D		1800
0.040		1440
0.062		1200
0.089		1029
0.122		900
0.159		800
0.201		720
0.248		655
0.300		600
0.358		554
0.420		514
0.487		450
0.636		400
0.804
1-1/2″ x 3/16″15W4
15W2		13.1
13.7		0.9U
D		2700
0.050		1728
0.078		1200
0.112		882
0.152		675
0.199		533
0.251		432
0.310		357
0.376		300
0.447		256
0.524		220
0.608		169
0.794		133
1.006
15P4
15P2		14.4
16.3		C
D		2700
0.040		2160
0.062		1800
0.089		1543
0.122		1350
0.159		1200
0.201		1080
0.248		982
0.300		900
0.358		831
0.420		771
0.487		675
0.636		600
0.804
1-3/4″ x 3/16″15W4
15W2		15.2
15.8		1.23U
D		3675
0.043		2352
0.067		1633
0.096		1200
0.130		919
0.170		726
0.215		588
0.266		486
0.322		408
0.383		348
0.450		300
0.521		230
0.681		181
0.862
15P4
15P2		16.5
18.4		C
D		3675
0.034		2940
0.053		2450
0.077		2100
0.104		1838
0.136		1633
0.172		1470
0.213		1366
0.257		1225
0.306		1131
0.360		1050
0.417		919
0.545		817
0.689
2″ x 3/16″15W4
15W2		17.3
17.9		1.6U
D		4800
0.037		3072
0.058		2133
0.084		1567
0.114		1200
0.149		948
0.189		768
0.233		635
0.282		533
0.335		454
0.393		392
0.456		300
0.596		237
0.754
15P4
15P2		18.6
20.5		C
D		4800
0.030		3840
0.047		3200
0.067		2743
0.091		2400
0.119		2133
0.151		1920
0.186		1745
0.225		1600
0.268		1477
0.315		1371
0.365		1200
0.477		1067
0.603
2-1/4″ x 3/16″15W4
15W2		19.4
20.0		2.03U
D		6075
0.033		3888
0.052		2700
0.074		1984
0.101		1519
0.132		1200
0.168		972
0.207		803
0.250		675
0.298		575
0.350		496
0.406		380
0.530		300
0.670
15P4
15P2		20.7
22.6		C
D		6075
0.026		4860
0.041		4050
0.060		3471
0.081		3038
0.106		2700
0.134		2430
0.166		2209
0.200		2025
0.238		1869
0.280		1736
0.324		1519
0.424		1350
0.536
2-1/2″ x 3/16″15W4
15W2		21.4
22.0		2.5U
D		7500
0.030		4800
0.047		3333
0.067		2449
0.091		1875
0.119		1481
0.151		1200
0.186		992
0.225		833
0.268		710
0.315		612
0.365		469
0.477		370
0.603
15P4
15P2		22.7
24.7		C
D		7500
0.024		6000
0.037		500
0.054		4286
0.073		3750
0.095		3333
0.121		3000
0.149		2727
0.180		2500
0.215		2308
0.252		2143
0.292		1875
0.381		1667
0.483
15W4 & 15P4 STANDARD PANEL WIDTH (inches)
Note: P-Press-Locked cross bars typically extend 1/8″ each side. W-Welded cross rods may extend 1/8″ each side.
Panel widths do not include these extensions.
No. of Bars2345678910111213141516
1/8″ Bar1-1/16″2″2-15/16″3-7/8″4-13/16″5-3/4″6-11/16″7-5/8″8-9/16″9-1/2″10-7/16″11-3/8″12-5/16″13-1/4″14-3/16″
3/16″ Bar1-1/8″2-1/16″3″3-15/16″4-7/8″5-13/16″6-3/4″7-11/16″8-5/8″9-9/16″10-1/2″11-7/16″12-3/8″13-5/16″14-1/4″
No. of Bars171819202122232425262728293031
1/8″ Bar15-1/8″16-1/16″17″17-15/16″18-7/8″19-13/16″20-3/4″21-11/16″22-5/8″23-9/16″24-1/2″25-7/16″26-3/8″27-5/16″28-1/4″
3/16″ Bar15-3/16″16-1/8″17-1/16″18″18-15/16″19-7/8″20-13/16″21-3/4″22-11/16″23-5/8″24-9/16″25-1/2″26-7/16″27-3/8″28-5/16″
No. of Bars3233343536373839
1/8″ Bar29-3/16″30-1/8″31-1/16″32″32-15/16″33-7/8″34-13/16″35-3/4″
3/16″ Bar29-1/4″30-3/16″31-1/8″32-1/16″33″33-15/16″34-7/8″35-13/16″