medeek said:

Link to Xingtai Steel

1.) Best placement of the mesh in the slab, centered, 2 in. from top, or stomped on by construction workers until it is in the bottom.

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If it's a residential, 4" slab I put the mesh at mid-depth. If you're going to dodge the saw-cuts and get a modicum of cover, putting it in the upper third as some recommend is pretty tough. As I see it, the placement comes down to two issues as far as cracking goes. Firstly, the reinforcement helps with axial strains and cracking across the slab. For this purpose, position isn't all that important and mid-depth makes sense. Secondly, the reinforcement helps with flexural strain and cracking at the top of the slab where local hard spots may result in hogging moments. I say to heck with latter. In a 4" slab with saw-cuts, I doubt you'll ever get the reinforcing high enough in the section to be effective flexural reinforcement.

medeek said:

2.) Should the mesh size extend to the perimeter of the slab? Ground clearance from edge and from bottom? If its a 4" slab isn't the 3" rule for reinforcement violated?

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I'd extend it to the perimeter or at least the last saw-cut joint if there is one near the perimeter. Cover is routinely violated in thin slabs on grade, both on the ground side and below the saw-cut joints. That's what's done and, at least for common interior applications, reinforcement rusting doesn't seem to come to pass or cause any problems. Slab on grade is, technically, not structural concrete.

medeek said:

3.) Most typical mesh size I've seen is 6x6-W2.9xW2.9 but I've also seen 6x6-W1.4xW1.4, any thoughts on what mesh size is best for a typical 4" and 6" slab (residential work).

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I've been using W1.4 for thing residential slabs. Frankly, I consider the reinforcing in these slabs to pretty much just be nominal rather than seriously purposeful. Where I'm doing non-calculated token detailing, I lean towards light.

medeek said:

4.) I've seen dobie blocks and wire chairs used to keep up slab bars, what should be used for mesh? Won't the workers step on the mesh and bend it out of shape or push it to the bottom?

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medeek said:

5.) #3 Bar, Mesh, or Fiber? What do you use and why?

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I like bars, fibers, or nothing from a performance/QC perspective as long as jointing is done properly. In my area it's almost always wire mesh because that's what contractors continue to prefer and expect.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

My opinion, presently:If it's a residential, 4" slab I put the mesh at mid-depth. If you're going to dodge the saw-cuts and get a modicum of cover, putting it in the upper third as some recommend is pretty tough. As I see it, the placement comes down to two issues as far as cracking goes. Firstly, the reinforcement helps with axial strains and cracking across the slab. For this purpose, position isn't all that important and mid-depth makes sense. Secondly, the reinforcement helps with flexural strain and cracking at the top of the slab where local hard spots may result in hogging moments. I say to heck with latter. In a 4" slab with saw-cuts, I doubt you'll ever get the reinforcing high enough in the section to be effective flexural reinforcement.I'd extend it to the perimeter or at least the last saw-cut joint if there is one near the perimeter. Cover is routinely violated in thin slabs on grade, both on the ground side and below the saw-cut joints. That's what's done and, at least for common interior applications, reinforcement rusting doesn't seem to come to pass or cause any problems. Slab on grade is, technically, not structural concrete.I've been using W1.4 for thing residential slabs. Frankly, I consider the reinforcing in these slabs to pretty much just be nominal rather than seriously purposeful. Where I'm doing non-calculated token detailing, I lean towards light. This . And yeah, it's a perpetual QC problem that routinely causes engineers to doubt the use of WWF for anything important.I like bars, fibers, or nothing from a performance/QC perspective as long as jointing is done properly. In my area it's almost always wire mesh because that's what contractors continue to prefer and expect.I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

What Size Reinforcing Mesh In Concrete?

Isabel Edwards | October 5,

Concrete is a popular material for everything from building a structure to adding a driveway outside your home. While it is strong and can withstand the worst of the weather, it sometimes can become brittle when there&#;s tension.

That&#;s why it is common to reinforce concrete with something. In the past, this has been steel bars known as re-bars. But now, with developments in manufacturing, concrete reinforcing mesh is the go-to option. So what size do you need for what project?

What is concrete reinforcing mesh?

As the name suggests, concrete reinforcing mesh is a type of strong mesh that can work with rebars or on its own to reinforce concrete. It is made from wires that are melded together to create flat sheets. These are usually in a grid pattern and there are different thicknesses as well as sizes available.

The company is the world’s best concrete slab mesh supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Once the mesh is inside the concrete, it remains there for a long time. There&#;s no worry about rusting because this requires oxygen &#; and buried in concrete, there is none. The mesh works with rebars if the stronger supports are also required. Sometimes they work just as well on their own, depending on the project.

Main types of reinforcing mesh

There are two main options when it comes to this kind of product &#; A142 reinforcing mesh and A393 reinforcing mesh. Each is used a little differently.

Using the A142 mesh

The A142 mesh is made with high-quality steel and has square ends to make it easier and safer to handle (in the 2.42 x 1.22 metre size) . It is perfect for residential use in floor slabs and foundations up to 100mm.
6mm wires are spaced to create 200mm x 200mm squares.

It is popular for use in concrete floors and other structures to increase the overall strength but is also highly durable. It should be manufactured to BS : or BS .

Using the A393 mesh

A393 mesh is made using 10mm thick wires. It is perfect for agricultural, industrial and transport industries as the thick wire increases the strength.

The A393 mesh size is also used for reinforcing concrete in floors and other parts of buildings to increase the strength. It is also used to help control cracks in concrete in areas where this is a common problem. The 10mm wires are spaced to create 200x200mm Squares.

A393 mesh reinforcement should exceed BS &#; or BS Standards

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Getting the right sheet size                 

Once you have decided which product you require, then you can look at the sheet size. It is tempting to go for a larger sheet with the industry-standard being 4.8 x 2.4 metres or 3.6 x 2.0  metres.

However, we generally stock a smaller size than this &#; 2.42 x 1.22 metres.  These sheets are easier to handle and will fit into the back of a transit van rather than needing a lorry to transport them. 

Smaller sheets are also easier to handle when adding them to concrete and because they are smaller, these are more rigid.  They still have the same finished edges so there are no sharp edges and require less cutting so there&#;s less waste.

Reinforcing your concrete         

There are lots of reasons to reinforce concrete and different methods to do it. Sheets of reinforcing mesh are easy to work with, highly effective and will last a long time, holding the concrete together and making it even tougher.

 

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