#8 rebar equivalant to how many #4's?
#8 rebar equivalant to how many #4's?
(OP)
I am told that to match our local code of one #8 bar top and bottom of footing walls one has to use 4 x #4 bars top and bottom. [Redwood Shores CA, reclaimed marshland]We only have 2x #4's top and bottom with much sagging and cracked wall problems. Could somebody please verify this for me? Thanks.






RE: #8 rebar equivalant to how many #4's?
This sounds like pretty basic engineering and mathematics.
A #4 bar is approximately half the diameter of a #8 bar. It is therefore approximately 1/4 the area of a #8 bar.
Based on this it is fairly obvious that 4 #4 would be needed to give the same area of reinforcement as 1 #8 bar.
RE: #8 rebar equivalant to how many #4's?
As of 1 #8 bar. .79
therefore 4 #4s = 1 #8
RE: #8 rebar equivalant to how many #4's?
StephenA