Description
The 6 mm PVC render stop bead with mesh is the single most-specified termination profile across UK thin-coat render and EWI systems, sized to the standard build-up most manufacturer details are dimensioned around: a 3–5 mm reinforced basecoat plus a 1.5–2 mm topcoat.
What the 6 mm PVC Stop Bead with Mesh Does in a Standard EWI System
The 6 mm PVC render stop bead with mesh is a 2.5 m white rigid PVC profile that creates a flush 6 mm termination edge at sill lines, expansion joints, plinth bands, and material change-overs on thin-coat silicone, silicate, and acrylic systems built over a reinforced basecoat. It sits at the centre of the render stop beads range, accommodating the combined thickness of basecoat, embedded mesh, and topcoat without burying the bead or leaving it proud, which is why most thin-coat manufacturer guidelines are dimensioned around this exact profile.
Specify the 6 mm mesh-wing variant for standard thin-coat over EPS, graphite EPS, or mineral wool insulation, or for direct-to-substrate renovation that retains a continuous reinforcement layer. For very thin single-coat decorative renders at 2–3 mm total thickness the 3 mm profile is the proportionate selection, and for heavier EWI build-ups with deeper basecoat passes the 10 mm and 15 mm variants step the termination up in proportion. Match the nose to the finished build-up and the bead disappears into a clean line at the elevation's most movement-prone edge.
Why Trade Specifiers Choose the 6 mm Mesh-Wing Profile for UK EWI
- Dimensional default for standard EWI: the 6 mm nose suits a 3–5 mm reinforced basecoat plus 1.5–2 mm topcoat without protruding or being buried, the build-up most manufacturer guidelines specify by default.
- Integrated alkali-resistant mesh wing: the factory-bonded fibreglass wing keys into wet basecoat and overlaps continuously with the system reinforcement mesh, removing the need for a separate edge strip.
- Crack control at the highest-movement line: mesh embedment distributes shrinkage and thermal stress across the bond zone, holding the termination against the hairline cracking that initiates where rigid profiles meet flexing render.
- Non-corrosive PVC body: unlike galvanised steel, the PVC profile produces no rust staining beneath light silicone or acrylic topcoats in damp UK exposure and coastal microclimates.
- Rigid nose for masking discipline: the straight edge holds masking tape true during topcoat application, producing sharp transitions between colours, finishes, or render-to-cladding boundaries.
Technical Specifications — 6 mm Stop Bead Data Sheet
| Property | Value |
|---|---|
| Profile type | Render stop bead with integrated mesh wing |
| Body material | Rigid PVC, white, UV-stabilised |
| Render depth (nose) | 6 mm |
| Length | 2.5 m per piece |
| Mesh | Alkali-resistant fibreglass, factory-bonded wing |
| Target render build-up | 3–5 mm reinforced basecoat + 1.5–2 mm topcoat |
| Mesh overlap with main reinforcement | 100 mm minimum |
| Frame gap (sealant joint) | 2–3 mm |
| Application temperature | +5 °C to +25 °C, governed by render system |
| On-site cutting | Tin snips or fine-tooth hacksaw |
| Compliance reference | Typically meets BS EN 13658-2 design principles for plastering accessories, subject to project documentation |
How to Apply the 6 mm Stop Bead — Bedding, Embedment, Curing
Apply a continuous bed of basecoat or EWI adhesive along the termination line, press the bead firmly so the mesh wing embeds fully into the wet material, and check the nose for line and level with a long straight edge before the bedding sets. The mesh should disappear into the basecoat, and if it stays visibly white on the surface more material is needed under the wing. Either allow the bedding to cure before applying the wider field, or set the bead first and feather the field basecoat over the wing in the same pass for a monolithic reinforced layer.
For the complete step-by-step process covering adhesive bed preparation, jointing on longer runs, mitre cuts at reveal corners, and sealant sequencing at frames, the stop bead installation guide for UK projects sets out each stage in order. For coordinating the 6 mm stop bead with corner beads, bellcasts, and oversills around openings, the render detailing guide for windows and doors covers the full profile sequencing.
Installation Notes — Conditions, Sealant Joints, Junctions
Where the bead terminates against a window or door frame, leave a 2–3 mm gap between the nose and the frame face. After the render has fully cured, this gap takes a low-modulus UV-stable sealant that forms the primary waterproof joint and accommodates differential thermal movement between render and frame. Closing the gap with render rather than sealant is the most common cause of edge cracking at frames on EWI work.
Lap the system reinforcement mesh a minimum of 100 mm onto the bead's mesh wing to maintain continuous crack control across the detail, embedding alongside the wider Ceresit CT325 fibreglass mesh field. At reveal corners, mitre the wings at 45° rather than overlapping them, since stacked mesh layers create a visible bulge that telegraphs through thin-coat finishes once the topcoat dries. On long soffit-line runs, butt the noses tightly end to end and overlap successive wings by the same 100 mm to keep the tensile network continuous.
Pro Tips From UK Installers Using the 6 mm Stop Bead
The habit that separates a monolithic reinforced termination from a cold-jointed one is setting the bead before the field basecoat, not after. Across EWI corner and edge specifications supplied through Renders World, treating the stop bead as a finishing step applied once the wall is already coated is the recurring cause of a weak termination, because the mesh wing lands on set basecoat with nothing fresh to embed into. Set first, let the bedding pull grab, then run the field basecoat over the wing in the same pass so the most movement-prone line on the elevation cures as one piece.
- Set the bead before the field basecoat: the wing needs fresh wet basecoat to embed into, so bead-first then feather-over produces a monolithic layer where bead-last leaves a cold joint.
- Order in whole opening perimeters: a 1.2 m × 1.2 m window needs 3.6 m, so one 2.5 m length plus a 1.1 m offcut covers it with the offcut feeding the next short return, giving near-zero waste across an elevation.
- Separate cut-off boxes by depth: the 3, 6, and 10 mm noses look alike at a glance, and a mis-pick costs more in lost time than the bead, so keep offcuts boxed by profile depth.
- Mitre only at corners, butt on straight runs: a mitre in a straight run introduces a visible kink, so reserve 45° cuts for internal and external corners and butt-joint everything else.
How the 6 mm Mesh Stop Bead Compares to the 3 mm Mesh Variant
Both are mesh-wing stop beads that embed into the basecoat reinforcement, so the decision comes down to the finished render depth at the termination. Read across to confirm the 6 mm nose finishes flush on your system before ordering.
| Variant | Key Spec | When to Choose |
|---|---|---|
| 6 mm PVC stop bead with mesh | 6 mm nose · mesh wing · 2.5 m | Standard EWI, reinforced basecoat + topcoat |
| 3 mm PVC stop bead with mesh | 3 mm nose · mesh wing · 2.5 m | Single-coat thin decorative renders |
Is the 6 mm PVC Stop Bead with Mesh Right for Your Project?
- Standard thin-coat render systems at 3–5 mm reinforced basecoat plus 1.5–2 mm topcoat: the primary use case and the most common UK EWI configuration over EPS, graphite EPS, or mineral wool insulation.
- Single-coat decorative renders around 2–3 mm finish thickness: step down to the 3 mm PVC stop bead with mesh for the proportionate shallower nose.
- Terminations against an existing finish with no continuous fresh basecoat behind them: the 6 mm PVC stop bead without mesh is the same-depth alternative where a mesh wing has nothing to key into.
- Monocouche, traditional sand-cement, or thicker basecoat systems: the deeper 10 mm and 15 mm options in the render stop beads range provide the proportioned nose those heavier finishes need.
- Quantity advice: a typical three-bedroom property with four to six openings needs 25–40 linear metres of 6 mm stop bead, and the Renders World technical desk can confirm exact lengths against elevation drawings on request.
The 6 mm stop bead is the highest-volume profile in the range and UK-stocked for next-working-day trade despatch at Renders World, supplied as single 2.5 m pieces. Measure both jambs and the head at each opening, divide by 2.5 m, and add 10–15% for cuts and mitres.
FAQ — 6 mm Stop Bead Coverage, Compatibility, Ordering
Why is the 6 mm depth the default specification for UK EWI?
Most UK external wall insulation systems are designed around a reinforced basecoat of 3–5 mm plus a 1.5–2 mm thin-coat topcoat, and the combined thickness sits naturally within a 6 mm nose, leaving the bead flush with the finished surface. That dimensional fit is why the 6 mm profile carries the highest order volume in the stop bead range and why most manufacturer details are drawn around it.
Does the integrated mesh replace the system reinforcement layer?
No. The wing reinforces the bond at the termination only, and the wider facade still requires a continuous reinforcement mesh embedded in the basecoat. Lap the system mesh at least 100 mm onto the bead's wing to maintain a continuous reinforced field across the bond zone.
How many 6 mm stop beads does an average opening need?
A 1.2 m × 1.2 m window requires stop bead along both vertical jambs and the head, totalling approximately 3.6 linear metres, which is two 2.5 m lengths per opening with a 1.4 m offcut to use elsewhere. A larger 1.5 m × 1.5 m opening needs 4.5 linear metres, and for a full elevation with six openings allow 14–16 lengths plus 10–15% for cuts and waste.
Can the 6 mm bead be installed in cold weather?
The PVC profile itself is unaffected by low temperatures, but the bedding adhesive or basecoat is. Install only when the chosen render or adhesive is within its application window, typically +5 °C and rising with no rain forecast within 24 hours of fixing. The bead sits happily on site until conditions improve.
Will the white nose show through coloured silicone topcoats?
With a correctly applied 1.5–2 mm thin-coat topcoat at the manufacturer's specified coverage rate, the white nose is fully masked by the through-coloured finish. Under-applied topcoats, usually the result of stretching material across a larger elevation than the coverage allowed, can leave the nose faintly visible, in which case masking the edge and over-painting with a matching silicone masonry paint restores a uniform appearance.
How is the 6 mm bead jointed on long runs?
Butt the noses tightly end to end and overlap the mesh wings by approximately 100 mm to maintain continuous tensile strength across the joint. Avoid mitre joints in straight runs, as they introduce a visible kink in the finished line, and reserve mitres for internal and external corners cut at 45° with a fine-tooth hacksaw rather than snips so the wing edge stays clean and the doubled mesh sits flat in the basecoat.