In almost any modern construction project, a certain amount of concrete is necessary to get the job done. It’s firm, sturdy, and reliable when you know how to use it. Sometimes, the bigger the construction project, the stronger you need your concrete to be. That’s why it is important to understand steel reinforcement mesh and its application in strengthening concrete.
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What is it? How do you know if you need it? Do all concrete construction projects need reinforcing mesh? Here’s what you need to know.
Rebar and Reinforcing Mesh Options
When it comes to reinforcing concrete, there are two main options. One option is rebar, or a reinforcing bar, which is a steel rod that comes in different thicknesses. These are usually ribbed for better grip. Rebars typically encompass the edges of the slabs.
The second option is wired mesh, which is often paired with rebars but not always. The steel mesh is made up of wires melded together into a flat sheet that forms a square, grid-like pattern. Like rebars, mesh comes in varying sizes and thicknesses, with the most common size being 1/8" thick (4 mm) and 6" long by 6" wide (150 mm x 150 mm).
Contrary to common belief, neither rebar nor mesh rust inside the concrete. The curing process of concrete seals them off from oxygen, which causes rusting of steel. This makes thicker slabs of concrete well-suited for steel reinforcement.
Do All Concrete Projects Need Reinforcement?
Not all concrete projects require reinforcement. Larger projects or slabs may need steel reinforcement to provide support or extra strength, particularly to resist cracking. However, not every concrete piece inherently requires this extra boost.
For major projects, it's important to carefully review plans and building requirements. Some locations mandate reinforcement regardless of the size or scale of the concrete being used, especially for certain public buildings.
Main slabs that require steel reinforcing mesh are those expecting a heavy workload. Projects like foot traffic areas, walls, or other foundational elements will benefit from this added strength.
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How Do You Know If You Need It?
If you’re working on something residential like a pathway or a shed floor, you likely don’t need the reinforcement. Even some driveways don’t need the steel mesh, but most recommend it since vehicles weigh quite a lot.
For structures like a carport or garage floor, although a permit might not be required, reinforcement would be beneficial. These structures handle considerable weight and traffic, needing that additional support.
Even in small projects, consider the ground beneath. Softer or spongy ground might necessitate some extra reinforcement to ensure stability.
Conclusion
If your permit or building ordinances require steel reinforcement, mesh wire is a great choice. For residential projects, the need for reinforcement varies. Assess the project type, the ground conditions, and the purpose of the concrete. These factors will help you decide on the necessity and extent of reinforcement.
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Personally, I'd go for a bit more than 3" of concrete if you're putting a vehicle on it, that would be OK for a footpath, but not really for anything more. Personally, I'd double that, but that may be overkill. And yes, mesh is important:
Concrete is strong in compression, but not under tension. So, if it flexes, like a slab with a vehicle on top will do, it cracks at the bottom where the flexing becomes tension. Steel mesh will prevent this to a large degree and hold it all together. This is why the mesh should sit closer to the bottom.
"Get the mesh cut into bits, then wire it together." That's what I would do. Or more likely get it delivered, with my ballast and cement.
I could go on about this ad infinitum (I've got qualifications in concrete — Yawn!) but I won't… ?
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