Top 5 Fiber Mesh Options for Crack Control in Concrete
Introduction
Concrete structures — whether slabs, screeds, plastered walls or renderings — are prone to cracking due to shrinkage, thermal changes, load stress or substrate movement. Incorporating fiber mesh (fiberglass mesh, alkali-resistant mesh or reinforcement mesh) helps distribute stresses, control shrinkage cracks and improve durability of concrete or mortar surfaces. This article outlines the Top 5 fiber-mesh solutions commonly used for crack control in concrete and masonry works.
Why Fiber Mesh Helps in Crack Control
Fiber mesh provides tensile strength to concrete or mortar layers, helping resist tension and bending stresses that often cause cracks. It reduces shrinkage-induced cracking, strengthens renderings or overlays, improves adhesion between layers and inhibits crack propagation. For humid or coastal climates (like Mauritius), using good quality, alkali-resistant mesh enhances longevity and performance of concrete works.
Key Qualities to Look for in Fiber Mesh for Crack Control
- Alkali-resistant fiberglass mesh for durability in cementitious mixes
- Strong tensile strength and tear resistance
- Uniform mesh size and quality control (e.g. 145 g/m² or 160 g/m² variants)
- Flexibility to conform to curved or uneven surfaces
- Good bonding with concrete or plaster mixes
- Corrosion resistance (for steel/welded mesh) if embedded in structural concrete
Top 5 Fiber Mesh Options for Crack Control in Concrete
1. Alkali-Resistant Fiberglass Mesh (Lightweight 145–160 g/m²)
This mesh is widely used in plaster, rendering or thin concrete overlays. Its lightweight and alkali-resistant properties make it effective for crack control in external and internal walls, preventing shrinkage cracks and improving surface durability. Suitable for coating over cement, gypsum or waterproof renders.
2. Heavy-Duty Fiberglass Mesh (200 g/m² and above) for Screed & Floor Slabs
For floor screeds, slabs and exterior overlays, heavier fiberglass or synthetic mesh provides higher tensile strength and better crack resistance under load or bending stresses. This helps control shrinkage cracks and improves load distribution across slabs and floors.
3. Alkali-Resistant Mesh with Welded Steel Core (Hybrid Mesh)
Hybrid mesh combines alkali-resistant fiberglass (or polymer mesh) with a welded steel core — offering both tensile resistance and structural support. It is suitable for structural concrete elements, beam-slab junctions or patch repairs where crack propagation is a concern. The steel core provides added strength while the fiberglass layer resists chemical attack from cement.
4. Welded Steel Reinforcement Mesh for Structural Slabs and Foundations
For foundations, heavy slabs or structural concrete that face load, bending or shear stresses — welded steel mesh remains among the most effective options for crack control. It distributes load, restrains crack opening and enhances long-term stability of structural elements. This is ideal for heavy-duty construction, basements, driveways or load-bearing slabs.
5. Glass-Fibre Mesh Embedded in Waterproof/Polymer Overlay Systems
When concrete or masonry surfaces are finished with waterproof or polymer-based overlay systems (for terraces, balconies or wet zones), embedding glass-fibre mesh within the overlay mix improves crack resistance, prevents shrinkage-era fissures and enhances durability under moisture and weather exposure. This solution is well-suited for humid or coastal conditions like in Mauritius.
Frequently Asked Questions
1. Which mesh is best for wall plaster crack control?
For wall plaster or rendering, alkali-resistant fiberglass mesh (lightweight 145–160 g/m²) is best — it reduces shrinkage cracks and improves surface durability.
2. Is welded steel mesh necessary for floor slabs?
Yes — for heavy slabs, basements or load-bearing floors, welded steel mesh distributes loads and controls structural cracks under stress.
3. Can mesh work in humid or coastal climates?
Yes — especially alkali-resistant fiberglass mesh or coated steel mesh used with proper concrete mixes or waterproof overlays — they resist corrosion and perform well in humid/coastal environments.
4. Does heavier mesh mean better crack resistance?
Generally yes — heavier fiberglass or steel mesh offers greater tensile strength and better crack control under load or stress. But mesh type must match project requirements (overlay, slab, wall, etc.).
5. Should mesh always be embedded mid-depth in concrete slab?
For reinforced slabs, mesh should be correctly positioned (usually near neutral axis or per structural design) to effectively control cracks. For overlays/plaster mesh, mesh should be near surface but embedded fully in mortar/overlay for best results.
Company List
- Riteseal (Mtius) Ltd
- Cemtech Mauritius
- MRC Wire Products Ltd
- JB Trading
- AGW Tradings
Conclusion
Effective crack control in concrete or plaster works requires careful selection of mesh type based on application — whether wall rendering, floor slabs, structural concrete, or waterproof overlays. The mesh options listed above — from lightweight alkali-resistant fiberglass mesh to heavy-duty welded steel mesh — offer reliable crack control and long-term durability. Pair the right mesh with proper mixing, placement and curing to ensure strong, crack-resistant concrete structures and finishes.