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Re: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF

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0.058 x 65/40 = .09425 sq in/foot or #3@14"
----- Original Message -----
Sent: Wednesday, June 02, 2004 10:18 AM
Subject: Re: What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF


This partly depends on what you mean by "equivalent layout".  From a strength standpoint the WWF is made in accordance with ASTM A185 which kicks you over to ASTM A82 for the actual wire.  The yield strength of the wires are 65 ksi when used to make mesh.  The equivalent area of the 6x6 W2.9 mesh is 0.058 sq in/foot so the equivalent area of #3 bar would be 0.058 x 40/65 = .036 sq in/foot or about #3s at 37 inches each way.  This may not be advisable for crack control so reduce spacing to what you feel comfortable with.

Thomas Hunt, S.E.
ABS Consulting

"Dennis Wish" <dennis.wish(--nospam--at)>

06/02/2004 12:50 PM

Please respond to

What is #3 Rebar equivalent for 6x6/W2.9xW2.9 WWF

Sorry, I forgot to give you the grid spacing on the WWF – it’s 6x6/W2.9xW2.9 – this is most commonly used WWF in our area for SOG’s – no expansive soils to worry about, all silty sand – no organics.
Can someone tell me what the equivalent layout is for #3 Fs=40ksi rebar in a 6” thick concrete (f’c=2,500 psi) slab on grade to replace the normal W2.9xW2.9 Welded Wire Fabric?

Dennis S. Wish, PE
California Professional Engineer
Structural Engineering Consultant

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