Economical extruded concrete members used for floors and roofs.
Particularly efficient when spans are short, loads are light, or minimal structural depth is desired.

Safe Superimposed Load Capacity (psf)
Desig. Strand 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50
4CF8 5.8 620 530 460 330 250 190 140 100 40 45                  
4CF8 7.8       405 355 280 205 165 125 95 65 45              
4CF10 6.8           325 265 215 165 130 100 75 50            
4CF10 8.8           405 355 290 235 190 150 120 95 70 50        
4CF12 8.8               370 310 260 215 180 145 120 95 75 55    
4CF12 9.8               395 340 290 240 200 165 135 110 85 65 50  
4CF12 10.8                 355* 310 260 215 180 150 120 100 80 60  
4CF12 10.8                   320* 280 325 190 165 135 110 90 70 55

* Requires additional concrete strength at Transfer.

Notes:

Based on allowable final tension of 7.5 (fc) or allowable design strength, whichever governs.
Loading is based on 3 in., 4000 psi composite topping
Deflections must be checked according to design criteria

8" CF

8 hollow core
Section Properties
Designation Ag(in.2) I (in.4) Yb(in.) Zb(in.3) Zt(in.3) wt (plf)
4CF8 214 1666 4.00 417 417 224

10" CF

10 hollow core
Section Properties
Designation Ag(in.2) I (in.4) Yb(in.) Zb(in.3) Zt(in.3) wt (plf)
4CF10 259 3223 5.00 645 645 270

12" CF

12 hollow core
Section Properties
Designation Ag(in.2) I (in.4) Yb(in.) Zb(in.3) Zt(in.3) wt (plf)
4CF12 289 5272 6.00 879 879 300