Combining Multiple WWR 1

[FiniteElement2012]

Question:
Is there a code limitation on how many Welded Wire Meshes can be combined together to attain required Moment Strength in a wall in single layer?

Example Discussion
If moment strength of a welded mesh required is 0.15 sq. in
Combing 3 layers of welded wire meshes 12x12 W5/W5 will = 3 * .05 sq. in = 0.15 sq. in of required strength in given direction. But is it permitted to combine 3 meshes together in a single layer?

 

[JedClampett]

Since most welded wire fabric gets mashed in the bottom of the pour, I would consider three layers to do as little as one layer. Plus, if the fabric gets moved around horizontally, it might act like a sieve, hang up the aggregate and give you a bad pour.
Is there a reason you don't want to use standard deformed reinforcing bars? I would use #4's at 12" to get your required steel. It might even be cheaper.

 

[FiniteElement2012]

What does experience say as related to combinng two mesh together?

 

[FiniteElement2012]

I do agree with you on three layers condition.
Notice that this will be a vertical wall application. For such application, what other problems can you possibly think of?

 

[JAE]

I'd worry that lighter WWF would have various waves to it - uneven locations along the height of the wall. WWF, unless tied adequately, will be quite flexible and I could see the placement of concrete pushing it all over the place.