4 Advice to Choose a concrete slab mesh

Steel reinforcement mesh, also known as rebar mesh or reinforcing mesh, is commonly used in construction projects to provide structural support and reinforcement for concrete structures such as slabs, walls, and foundations. Proper installation and handling of steel reinforcement mesh are essential to ensure the structural integrity and durability of the concrete. Here are some tips for using steel reinforcement mesh effectively:

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1. Choose the Right Type and Size

Before purchasing steel reinforcement mesh, determine the appropriate type and size based on the specific requirements of your project. Consider factors such as the thickness of the concrete slab, the spacing of support beams, and the load-bearing capacity needed. Choose mesh with the correct bar diameter, spacing, and configuration to meet the structural design requirements.

2. Handle with Care

Steel reinforcement mesh can be heavy and unwieldy, so handle it with care to prevent injuries and damage. Use proper lifting techniques and equipment, such as forklifts or cranes, to transport and position the mesh safely. Avoid dropping or dragging the mesh, as this can cause bending or deformation of the bars, compromising their structural integrity.

Concrete Reinforcement Mesh

3. Ensure Proper Placement and Alignment

When installing steel reinforcement mesh, ensure that it is placed at the correct depth and aligned according to the design specifications. Position the mesh in the center of the concrete slab or wall to provide uniform reinforcement throughout the structure. Use spacers or supports to maintain the desired clearance between the mesh and the formwork or ground surface.

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4. Overlap Joints and Secure Connections

Overlap joints in the steel reinforcement mesh to ensure continuity and strength in the reinforced concrete structure. Follow the design requirements for the length of overlap and the method of securing the connections, such as tying the bars together with wire or using mechanical connectors. Properly secured connections prevent displacement of the mesh during concrete placement and curing.

5. Check for Compliance with Building Codes

Before installing steel reinforcement mesh, familiarize yourself with local building codes and regulations governing the use of reinforcing materials in concrete construction. Ensure that the mesh meets the required standards for material quality, dimensions, and installation practices. Compliance with building codes helps ensure the structural integrity and safety of the finished concrete structure.

6. Coordinate with Other Trades

Coordinate the installation of steel reinforcement mesh with other trades involved in the construction process, such as concrete contractors, formwork installers, and structural engineers. Communicate effectively to ensure that the mesh is installed correctly and integrated seamlessly with other building components. Address any conflicts or discrepancies in the construction plans promptly to avoid delays and rework.

7. Perform Quality Control Inspections

Conduct regular quality control inspections during the installation of steel reinforcement mesh to verify compliance with design specifications and construction standards. Inspect the mesh for proper placement, alignment, and connection integrity. Address any issues or deficiencies promptly to prevent potential problems in the finished concrete structure.

By following these tips, you can effectively use steel reinforcement mesh to enhance the strength, durability, and performance of concrete structures in your construction projects.

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I know we've beaten this topic to death but I thought I might revisit it one more time. The questions that are still nagging are:

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

For reference the image below shows a typical or proposed SOG with mesh reinforcement.



A confused student is a good student.
Nathaniel P. Wilkerson, PE
My opinion, presently:

medeek said: 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.

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?

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).

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?

This. And yeah, it's a perpetual QC problem that routinely causes engineers to doubt the use of WWF for anything important.

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

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. If you are looking to get flexural reinforcement ratios for a 4" S.O.G., then good luck - especially with wire mesh. All we ever use mesh for in the South is for typical T&S steel. If you truly need flexural capacity, then use bars. If you do though, move up to a 6"-thick slab: its more practical, more workable, and more forgiving of slight reinforcement depth displacement. Space the bars at 16" o.c., so workmen can walk without stepping on the bars. And never, ever, let the workmen "hook and lift" ANY reinforcing - ever. As KootK suggested, if you want to keep the 4" slab thickness, opt for fiber reinforcing instead - it more than pays for itself in saved labor, and headaches about big shrinkage cracks forming because the wire was lying on the ground at the bottom of the slab, and working to exacerbate the cracking. The old joke around here is to use a "standard #6 slab": 6"-thick, #6 wire mesh, with 6" x 6" spacing. ;-)
Dave

Thaidavid