Description
Specified at 160 g/m² with measured tensile strength of 1195 N/5cm warp and 1220 N/5cm weft, the Ceresit CT325 Fibreglass Reinforcing Mesh (55 m² roll) is the heavier-duty mesh class engineered for impact-prone facade zones, plinth bands, and high-stress EWI details where standard 150 g reinforcement reaches the limits of its mechanical envelope. Sold here through our fibreglass mesh collection, this Henkel-manufactured mesh is approved as a component in Ceresit Ceretherm EWI systems and tested to ETAG 004. Trade collection from our Southampton counter or next-working-day UK dispatch.
Product Overview
The 160 g/m² weight class sits one step above general-purpose reinforcement, designed for situations where additional tensile capacity earns its place in the basecoat. The Ceresit CT325 mesh is woven with a 4.0 × 4.0 mm aperture in a tearproof, slip-proof construction — the green colouring is the visual identifier across UK and European EWI sites. After 28 days of submersion in 5% sodium hydroxide solution, the mesh retains its specified strength, demonstrating the alkali resistance demanded by long-service contact with cementitious basecoats.
Each roll measures 1.1 metres wide by 50 metres long, giving 55 m² coverage — the wider format compared to standard 1.0 m mesh reduces the number of vertical overlaps across full-height facade runs.
Key Benefits
- Higher tensile capacity: measured strength of 1195 N/5cm warp and 1220 N/5cm weft (per Henkel TDS) gives meaningful headroom over standard 150 g specifications for impact and high-stress zones.
- 1.1 m wider roll format: the extra 100 mm of working width compared to 1.0 m mesh reduces vertical jointing on full-height facades, saving overlap waste on tall elevations.
- ETAG 004 tested: verified within the European Technical Approval Guideline for ETICS systems, supporting full Ceresit Ceretherm system warranties when installed within specification.
- Verified alkali resistance: 28-day NaOH testing protocol per manufacturer TDS confirms long-term stability in cementitious basecoat environments.
- System-component certified: approved for embedding into Ceresit reinforcing mortars across the Ceretherm EWI system family.
Technical Specifications
| Property | Value |
|---|---|
| Manufacturer | Henkel (Ceresit brand) |
| Material | Woven fibreglass with alkali-resistant coating |
| Mesh weight | ≥160 g/m² |
| Mesh aperture | 4.0 × 4.0 mm |
| Tensile strength — warp | 1195 N/5cm (standard conditions) |
| Tensile strength — weft | 1220 N/5cm (standard conditions) |
| Alkali resistance | 28 days in 5% NaOH — strength retained per TDS |
| Roll width | 1.1 m |
| Roll length | 50 m |
| Roll coverage | 55 m² nominal |
| Colour | Green (visual identifier) |
| Standard | ETAG 004 compliant within ETICS systems |
Application & Compatibility
CT325 is the specified mesh for Ceresit Ceretherm EWI systems but compatible with all standard cementitious and polymer-modified basecoats from the EPS adhesives and basecoats range. The mesh wraps cleanly around corner beads and termination profiles and integrates with the wider reinforcement strategy — corner mesh wraps, diagonal stress patches at openings, and continuous lap detailing along facade runs.
For overlap dimensions, sequencing rules, and the geometry of stress reinforcement at openings, our fibreglass mesh overlap guide covers the site-applicable principles in detail.
Installation Notes
Apply the prepared reinforcing mortar using a notched trowel with 10–12 mm teeth, spreading evenly over the insulation board face. For mineral wool substrates, prime the board with a thin scratch coat of mortar before the main basecoat application — wool fibres absorb adhesive moisture and the priming step prevents premature drying that would compromise mesh embedment.
Press the mesh into the wet mortar from top down using a flat metal trowel, then immediately smooth a second mortar pass over the mesh until the weave is fully embedded and barely visible. Mesh strips must lap by 100 mm minimum at vertical joints, and lap lines must never coincide with insulation board joints — offset the mesh layout from the substrate joint pattern. At openings, embed 200 × 300 mm diagonal stress patches before the main mesh layer goes on.
Trade Insight: When 160 g Earns Its Specification
The cost premium over standard 150 g mesh — such as the Atlas 150 g/m² 50 m² roll — is justified by the application zone, not by a blanket assumption that heavier always performs better. Three scenarios where 160 g is the correct specification: ground-floor facades on commercial or high-traffic residential buildings where impact resistance matters; plinth bands and the lower 2 metres of any rendered facade exposed to mechanical contact; and EWI systems where the project specification or system DoP names CT325 specifically. For full-height facades on standard residential EWI work above the impact zone, 150 g remains the specified weight on most ETA system documents and the cost difference goes uncashed. The 1.1 m roll width is the additional reason CT325 sees specification on tall elevations — fewer vertical overlaps means less waste and a faster install rhythm. Trade-quantity pricing applies on multi-roll orders.
Is This Product Right for Your Project?
- Impact-zone reinforcement: the right specification for plinths, ground-floor commercial facades, and any zone where mechanical contact is foreseeable.
- Standard EWI above impact zone: for full-facade reinforcement on standard residential EWI, the Atlas 150 g/m² mesh is the specified weight and reduces material cost without compromising system performance.
- Ceresit Ceretherm system specification: the named mesh component for warranty-supported Ceretherm system installations.
- Tall elevations: the 1.1 m roll width reduces vertical jointing on full-height facade runs, cutting overlap waste compared to 1.0 m formats.
FAQ
What does the higher 160 g weight actually deliver in practice?
Higher tensile capacity (1195/1220 N/5cm warp/weft per TDS) and improved impact resistance once embedded. In typical service this translates to better performance at building corners, around openings, and on facade zones below 2 metres where impact is foreseeable. On standard mid-facade reinforcement above impact height, the practical difference compared to 150 g mesh is marginal.
How many rolls do I need per m² of facade?
One 55 m² roll typically reinforces around 50 m² of finished facade once 100 mm vertical overlaps and corner stress patches are deducted. As a planning rule, divide your measured facade area by 0.91 to estimate roll demand, then round up.
Is the mesh layout direction important?
Yes. Run mesh strips so vertical laps fall offset from insulation board joints — never aligned. Lap lines coinciding with substrate joints concentrate stress in exactly the wrong place and undermine the reinforcement strategy.
Can it be cut to size on site?
Yes, with sharp scissors or a trimming knife. The acrylic coating prevents fibre fraying at the cut edge during normal handling, and offcuts of 200 × 300 mm sized at openings are part of the standard install sequence.
What is the storage requirement before installation?
Store rolls flat, dry and out of prolonged sun before installation. The alkali-resistant coating is stable through normal site exposure but extended UV on uncovered rolls is best avoided to preserve coating integrity over the storage period.
Technical Documentation