Ledger

rectangular beams
Section Properties
Designation h(in.) h1/h2(in.) A(in.2) Yb(in.) I(in.4) Sb(in.3) St(in.3) wt (plf)
20LB20 20 8/12 336 8.86 10249 920 1157 350
20LB24 24 12/12 384 10.5 17568 1301 1673 505
20LB28 28 16/12 432 12.22 27883 1767 2282 568
20LB32 32 20/12 480 14 41600 2311 2971 632
20LB36 36 24/12 528 15.82 59119 2930 3737 695
20LB40 40 24/16 608 17.47 81282 3608 4653 800
20LB44 44 28/16 656 19.27 108107 4372 5610 863
20LB48 48 32/16 704 21.09 140133 5208 6645 926
20LB52 52 36/16 752 22.94 177752 6117 7749 990
Safe Superimposed Load Capacity (psf)
Desig. Strand 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 52
20LB20 8.8 6500 5080 4040 3300 2720 2260 1920 1640 1400 1200 1040              
20LB24 10.8   8000 6400 5220 4340 3650 3100 2660 2280 1980 1740 1520 1340 1180        
20LB28 12.8     9040 7400 6180 5200 4440 3820 3300 2880 2520 2230 1980 1760 1560 1400 1250  
20LB32 14.8       9640 8040 6780 5760 4980 4320 3780 3320 2920 2600 2320 2080 1860 1680 1520
20LB36 16.8           8820 7540 6480 5660 4960 4360 3880 3460 3080 2760 2500 2240 2040
20LB40 18.8             9420 8160 7080 6220 5500 4860 4340 3880 3500 3140 2840 2580
20LB44 20.8               9900 8760 7660 6800 6040 5360 4840 4340 3920 3560 3240
20LB48 22.8                   9300 8240 7300 6560 5880 5300 4800 4360 3960
20LB52 24.8                       8800 7820 7040 6400 5800 5260 4800

Notes:

Load Charts are intended for preliminary design only.
Other section available. Consult MBI Engineering Department
Max tension allowed under full loading = 850 psi, therefore, additional top reinforcement is required
Design criteria ACI 318-02
Concrete strength at 28 days (f`c) = 5000 psi
Design charts assume simple span
Safe loads shown include 50% dead load and 50% live load.
Deflections must be checked according to design criteria.