200491
Ceresit CT325 - Fibreglass mesh 160g - 55m2 - roll
What is Ceresit CT 325?
Ceresit CT 325 is a professional-grade, alkali-resistant glass fibre mesh used to reinforce the basecoat layer in External Wall Insulation (EWI) systems. It is engineered to absorb thermal stresses and mechanical impacts, effectively preventing cracks in the final render finish. It is a mandatory component for both EPS and Mineral Wool insulation systems to ensure long-term facade durability.
| Technical Specification | Value / Detail |
|---|---|
| Material | Glass fibre with alkali-resistant coating |
| Weight | 160g/m² (Industry Standard) |
| Mesh Size | Approx. 4.0 x 4.0 mm |
| Roll Dimensions | 1m wide x 50m long (50m²) |
| Compatible Basecoats | Ceresit CT 190, CT 85, ZU |
| Application | EWI systems, internal plastering, and renovation |
- Why does render mesh need to be alkali-resistant?
Standard glass fibre would be "eaten away" over time by the high pH levels (alkalinity) found in cement-based basecoats. Ceresit CT 325 features a specialized chemical coating that protects the fibres, ensuring the reinforcement remains strong for the entire lifespan of the building. - What is the overlap requirement for CT 325 mesh?
To ensure a continuous reinforced layer, every strip of mesh must overlap the adjacent piece by at least 10cm. Failing to overlap the mesh is the most common cause of vertical cracks appearing in the finished render. - Can CT 325 be used for internal plastering?
Yes. While primarily designed for external facades, CT 325 is an excellent solution for internal walls that are prone to cracking or for reinforcing joints between different building materials (e.g., where brick meets wood).
- Apply Basecoat: Spread a layer of Ceresit basecoat (like CT 190) onto the insulation boards using a 10mm notched trowel.
- Embed Mesh: Lay the CT 325 mesh vertically into the wet mortar from top to bottom.
- Smooth Over: Use a flat trowel to press the mesh into the mortar until it is fully embedded and no longer visible.
- Overlap: Ensure each new strip overlaps the previous one by 10cm. Double-mesh areas around window corners (45-degree "butterfly" strips) for extra strength.
- Finish: Once the mesh is embedded, apply a second thin layer of basecoat to create a perfectly smooth surface for the primer and render.
- Pro-Tip for High-Traffic Areas: If the building is a school or near a public walkway, we recommend "Double Meshing" the ground floor. Apply two layers of CT 325 to achieve Category I Impact Resistance, protecting the wall from kicks, balls, and bikes.
- Pro-Tip on Placement: Never "dry-fix" the mesh to the wall with staples before rendering. The mesh must be embedded in the middle of the wet basecoat to work correctly as a reinforcement; if it sits against the insulation, it provides no strength.