Description
Embedded into the basecoat of every external wall insulation build-up, the Atlas Fibreglass Reinforcing Mesh 150 g/m² (50 m² roll) is the standard-weight reinforcement layer that locks the system together, distributing thermal stresses and giving decorative renders the stable substrate they need. Supplied through our fibreglass mesh collection, this 1.0-metre-wide alkali-resistant mesh is certified for use within ETA-approved EWI systems and pairs with all standard adhesives and basecoats specified across UK insulation work. Trade collection from our Southampton counter or next-working-day UK delivery on full and pallet quantities.
What Atlas 150 g/m² Mesh Does in a UK EWI System
The Atlas 150 g/m² fibreglass mesh is a woven, alkali-resistant reinforcement layer embedded mid-thickness within the basecoat over EPS, graphite EPS or mineral wool, distributing thermal stress and resisting crack telegraphing through ETA-approved EWI build-ups. It is the European industry-standard mesh weight for general facade reinforcement, sized at 1.0 m × 50 m for a manageable 50 m² nominal roll coverage. The first roll a contractor opens on a UK EWI job is almost always this one, and the reason becomes obvious after the second pass of basecoat trowels flat over a perfectly bedded weave.
Reinforcement mesh is what turns a render system from brittle to resilient. Pressed into the wet basecoat above the insulation board, the mesh absorbs the expansion and contraction that would otherwise crack a rigid render surface, particularly across board joints and at high-stress points around openings. The 150 g/m² weight is balanced for coverage area, embedment ease, and tensile strength, which is why it appears on the system documentation for nearly every standard EWI build-up sold in the UK and across Europe.
Why Trade Specifiers Choose Atlas 150 g/m² Mesh
- Alkali-resistant acrylic coating: the protective treatment allows the mesh to survive prolonged contact with cementitious and polymer-modified adhesives without degradation, maintaining tensile strength through the system service life.
- Specified weight for UK EWI work: 150 g/m² is the reinforcement weight named on the vast majority of UK and European EWI system documents, suiting both EPS and mineral wool insulation under thin-coat finishes.
- Crack-distribution performance: the woven warp-and-weft structure spreads thermal and mechanical stress laterally, reducing the risk of cracks telegraphing from board joints to the finished render face.
- ETA-system component: approved within European Technical Approval EWI systems, supporting full system warranties when installed inside the specified build-up.
- Practical 50 m² roll format: 1.0 m × 50 m gives a manageable handling weight on site and reduces vertical jointing on full-height facade reinforcement.
- Atlas manufacturing consistency: Polish-manufactured mesh with tight tolerance on areal weight (−3 / +10%), giving predictable embedment behaviour batch to batch.
Technical Specifications — Atlas 150 g/m² Mesh Data Sheet Highlights
| Property | Value |
|---|---|
| Material | Woven fibreglass with alkali-resistant acrylic coating |
| Manufacturer | Atlas (Poland) |
| Mesh weight | 150 g/m² (tolerance −3 / +10%) |
| Roll width | 1.0 m |
| Roll length | 50 m running metres |
| Roll coverage | 50 m² nominal |
| Weave | Open gauze, warp and weft |
| Alkali resistance | Suitable for embedment in cementitious basecoats |
| Certification | ETA-system component, subject to system specification |
| Storage | Dry, flat, away from prolonged UV exposure prior to install |
How to Embed Atlas 150 g/m² Mesh — Basecoat Pass, Overlap, Corner Stress Patches
For the cleanest result, apply the basecoat in two passes rather than one. Trowel an initial layer of EPS adhesive or basecoat onto the insulation, press the mesh into the wet bed working from top down, and immediately cover with a second pass that fully embeds the mesh. The weave should be barely visible through the wet finish, with the mesh sitting in the outer third of the basecoat thickness rather than against the board itself.
Overlap successive sheets by 100 mm minimum at vertical joints, and add diagonal mesh strips at the corners of window and door openings before the main mesh layer goes on. These stress-relief patches absorb the concentrated movement at openings where standard-layer cracking otherwise initiates. The full reinforcement-layer method, including basecoat thickness windows and mesh sequencing on returns and reveals, is covered in our complete basecoat and mesh reinforcement layer guide. For overlap dimensions on awkward elevations and the geometry around corner beads, the fibreglass mesh overlap guide for UK projects is the working reference.
Installation Notes — Conditions, Sequencing, Detail Reinforcement
The mesh embeds best when the basecoat is wet enough to accept the weave without snagging. Plan each lift so the second basecoat pass goes on while the first remains workable, typically within fifteen to twenty minutes depending on substrate suction and ambient temperature. Working top-down with two operatives, one rolling out and pressing in, the other closing with the second pass, keeps the rhythm clean across a full elevation.
At corner beads and stop profiles, the mesh wraps cleanly into the system, integrating with the wider reinforcement strategy. Where mesh from a profile already covers an edge, the main field mesh overlaps onto the profile mesh by 100 mm to maintain continuous reinforcement. On door and window openings, the diagonal stress patches go on first at roughly 45 degrees, sized around 200 × 300 mm at each corner, followed by the main field mesh trimmed neatly to the bead. This sequence is the single biggest factor in preventing the diagonal corner cracks that otherwise show up on rendered openings within the first two heating cycles, a pattern explained in our guide to render cracking causes and prevention.
Pro Tips From UK Installers Using Atlas 150 g/m² Mesh
A few habits separate clean mesh work from mesh work that telegraphs through the finish. The list below is what experienced UK applicators consistently get right.
- Cut to length before you climb: measure the elevation and pre-cut sheets to length with a 100 mm overlap allowance, so each operative on the scaffold is bedding, not measuring.
- Work the second pass with a clean trowel: a clean blade closes the basecoat over the weave without dragging fibres up, leaving a flat surface that needs minimal sanding before primer.
- Keep diagonal patches in a separate bag: pre-cut 200 × 300 mm patches in batches of fifty at the start of the day; opening corners are where rhythm breaks down on a busy facade.
- Check embedment with a sideways glance: stand parallel to the wall after each lift; the weave should read as a faint texture, not a defined pattern, before the basecoat skins over.
- Roll storage matters: bring rolls onto the scaffold standing up, not flat, so the cut edge stays clean and the roll feeds smoothly off the spindle.
Is Atlas 150 g/m² Mesh Right for Your Project?
- Default for standard EWI builds: the right specification for full-facade reinforcement over EPS, graphite EPS and mineral wool with standard 4–6 mm basecoat thickness.
- Step up for high-impact zones: for plinths, ground-floor commercial facades and impact-prone areas, the heavier Ceresit CT325 160 g/m² mesh (55 m² roll) adds tensile reinforcement where it earns its place.
- Coverage planning: the 50 m² roll suits projects from single-elevation refurbishment up to multi-roll new-build EWI work, with pallet pricing on bulk orders.
- System-specification work: approved as a component within ETA-certified EWI systems; check the relevant system DoP for compatibility with the specified adhesive and finish.
FAQ — Atlas 150 g/m² Mesh Coverage, Compatibility, Ordering
How many rolls do I need per square metre of facade?
One 50 m² roll typically reinforces 45–48 m² of finished facade once 100 mm vertical overlaps and corner stress patches are deducted. As a planning rule, divide measured facade area by 0.92 to estimate roll demand, then round up.
Is Atlas 150 g/m² mesh compatible with Ceresit and Stopter basecoats?
Yes. The alkali-resistant coating is formulated for embedment in any standard cementitious or polymer-modified EWI basecoat, including Ceresit CT85, CT87 and Stopter K20. Mesh specification is system-neutral provided weight and width meet the basecoat manufacturer's stated requirement.
How does the Atlas 150 g/m² compare to the Ceresit CT325 160 g/m²?
Atlas 150 g/m² is the specified weight for general facade reinforcement and ships in a 1.0 m × 50 m roll. The Ceresit CT325 is a 160 g/m² mesh in a 1.1 m × 50 m roll (55 m² nominal), suited to impact-prone zones, plinth bands and projects where the system DoP calls for the heavier weight.
Why does the mesh need to sit in the outer third of the basecoat?
Reinforcement works best where tensile stresses concentrate, on the outer face of the basecoat closest to the decorative finish. Mesh pressed flat against the insulation board gives no meaningful crack resistance because the high-stress zone is outboard of where the mesh sits.
Is 150 g/m² enough for impact areas such as plinths?
For general facade height it is the specified weight. For plinths, areas below 2 m on commercial facades, or zones exposed to mechanical impact, system designers commonly double-layer the 150 g mesh or step up to 160 g for additional impact resistance.
What overlap is required at vertical joints and internal corners?
A minimum of 100 mm at each vertical joint, applied during the wet basecoat pass so the overlap embeds into a continuous adhesive bed. Internal corners typically take a wrapped 200 mm fold rather than a butted joint, keeping reinforcement continuous around the change of plane.
Technical Documentation — Atlas 150 g/m² Mesh TDS and Manufacturer Data