Fibermesh - Structural engineering general discussion - Eng-Tips

23 Jun.,2025

 

Fibermesh - Structural engineering general discussion - Eng-Tips

I have a customer who would like to use fibermesh concrete instead of rebar cage on an 8’ x 5’ x 3’ deep block footing supporting a heavy MRI unit (16,000 lbs) in a hospital building in California (no freeze-thaw issues). Foundation is only subject to compression loads of equipment, and there are some anchor bolts in the concrete. I don’t know enough about fibermesh to know if this would be OK or not. I’m inclined to say it’s not OK and rebar cage is better. Do you have someone there with experience who could comment? Thanks. Fiber reinforcement is primarily there to help control shrinkage cracks (usually in slabs).
I'm not sure what good it would do in a large footing.
It certainly won't replace steel reinforcement for flexural stresses, shear, etc.


I don't think plastic fibers do any good for strength. But this is the support for an MRI unit, which is probably the reason for avoiding steel. I imagine your size footing would be fine unreinforced. Steel Fibres are now being used as flexural and shear reinforcement, ie strength design. We have done a job that used Helix Microbar fibres for flexural reinforcement of suspended slab on grade.

Our latest Australian concrete code AS- includes a section on steel fibre design. Aside from all arguments about fibres, steel or plastic, the MRI manufacturer's recommendations must be followed as to the permissibility of magnetic materials within proximity of the machine. These machines cost millions, so you don't want your footing to be the tail wagging the dog. The aspect ratio of the fibers has some effect on the tendency to clump when mixing. Shorter fibers disperse a bit better than longer fibers for metal fibers. Polypropylene fibers are usually relatively short and have a different "first crack" affect than steel fiber. Steel fiber typically provides better property enhancement than poly fibers.

Fiberglass Mesh: A Must-Have Material for Reinforcing Surfaces

Home » Blog » Fiberglass Mesh: A Must-Have Material for Reinforcing Surfaces

In the world of construction and renovation, achieving long-lasting results often depends on using the right support materials. One such essential tool is fiberglass mesh. This product might seem simple, but it plays a vital role in ensuring strength and stability across a range of surfaces.

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From wall reinforcement to tile backing, fiberglass mesh offers versatile solutions with unmatched reliability. Let’s take a closer look at what it is, how it’s used, and why professionals trust it.

What is Fiberglass Mesh?

Fiberglass mesh is a grid-like fabric made from glass fibers that are woven and coated for added durability. It is typically packaged in large rolls, with one common variant being 1 meter in width and 50 meters in length, weighing 145 grams per square meter, and structured in a 5×5 mm weave pattern.

This mesh is used to strengthen substrates, especially those prone to cracking or stress. Once embedded into plaster or mortar, it acts as a reinforcement layer that helps hold everything in place.

Practical Applications

This lightweight mesh is incredibly versatile. It’s commonly used to reinforce both external and internal walls, especially when working with plaster or stucco systems. When applied, it provides added tensile strength, which helps to prevent surface cracks from forming due to shifting, expansion, or impact.

One of its standout uses is in the tiling and stone installation sector, where it’s applied to the back of mosaics, marble, and other natural stones. The mesh gives fragile tiles additional support and helps them stay adhered to the mounting surface more effectively.

It’s also widely used in the repair and reinforcement of slabs, particularly in areas that have already begun to show surface cracks. Builders value it for its flexibility, which allows it to mold to uneven or curved surfaces.

A Safe and Environmentally Sound Choice

Fiberglass mesh is also recognized for being a non-toxic and environmentally safe product. It does not contain any asbestos or formaldehyde, making it compliant with global health and safety standards. This makes it suitable for use in indoor living spaces, schools, hospitals, and homes.

In addition, it’s alkali-resistant, so it won’t degrade when in contact with cement-based materials. That means your structure will maintain its integrity longer, reducing the need for frequent repairs or replacements.

Key Features

One of the most praised features of fiberglass mesh is that it is slide-resistant. This means once it’s installed and embedded into the plaster or adhesive, it stays put. There’s no unwanted movement during application, which allows for a smoother, more uniform finish.

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Despite its lightweight structure, the mesh offers impressive strength and resistance to tearing. It’s also not affected by moisture, preventing issues like mold, corrosion, or decay—common concerns in humid environments.

Its open-weave design ensures that air bubbles and moisture escape during installation, reducing the chances of defects or finish problems.

Installation Benefits

Fiberglass mesh is known for being user-friendly. It can be cut to size with scissors or a blade, and once applied to the working surface, it easily bonds with various mortars or adhesives.

This ease of use speeds up project timelines and improves the quality of the final finish. Even less-experienced users can achieve professional-grade reinforcement with minimal tools or hassle.

Where You’ll See It Most

Professionals rely on fiberglass mesh for:

  • Wall and ceiling reinforcement
  • Strengthening lightweight boards
  • Securing mosaic or marble tiles
  • Crack repair and slab support
  • Plastering and waterproofing systems

From new builds to renovation projects, its versatility allows it to be used in residential homes, commercial buildings, and public infrastructure projects.

Why Contractors Prefer It

Compared to traditional metal reinforcements, fiberglass mesh is easier to work with, safer to handle, and doesn’t rust. These advantages make it the preferred choice for contractors aiming for long-term durability with a quick installation process.

It’s a cost-effective solution that doesn’t compromise on quality—ideal for large construction sites as well as smaller home improvement tasks.

When you’re aiming for strong, crack-free surfaces that stand the test of time, fiberglass mesh is a material you can count on. It’s simple, efficient, and highly effective in adding structural support wherever it’s applied.

Whether you’re working on walls, ceilings, mosaics, or slabs, using fiberglass mesh ensures a higher-quality finish and greater peace of mind. As construction methods continue to evolve, this time-tested product remains a reliable ally for builders around the globe.

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