Description
The Corner PVC Render Bead with Mesh 2.5m is a coextruded uPVC L-profile carrying 145 g/m² alkali-resistant fibreglass wings, engineered for external 90° corners on EWI build-ups and direct thin-coat render across EPS, graphite EPS, XPS, mineral wool, and cement-board substrates.
Where This PVC Corner Bead Performs Best — UK Corners and Substrates
At 2,500 mm with a 100 mm coextruded mesh wing on each face at 145 g/m², this bead is the working default for external 90° vertical corners on UK thin-coat render and EWI facades. It sits within the wider render corner beads range at Renders World and integrates with Atlas, Ceresit, and comparable thin-coat systems. The profile is embedded inside the basecoat, not surface-fixed, so the wings overlap the field reinforcement mesh and carry thermal, wind, and impact load away from the arris into the reinforced facade.
The 88° inner angle springs to a true 90° once bedded, and the 2,500 mm length matches standard storey heights and reveal returns with minimal cutting. For a first EWI corner or a specifier verifying the build-up sequence, the corner stage is one of the few facade hours where correct embedment pays back across the full 25-year service life of the system.
Why Specifiers Choose This Coextruded PVC Mesh-Wing Bead
- Coextruded mesh-to-PVC bond — wings and core are joined during manufacture, so the mesh cannot peel, lift, or displace during handling.
- 145 g/m² alkali-resistant wings — tensile performance preserved in the high-pH basecoat, with 100 mm width per side for genuine overlap continuity with field mesh.
- Crisp arris across 2,500 mm — the rigid PVC core holds a straight line under raking light that hand-floated methods rarely match at scale.
- Lead-free UV-stabilised uPVC — the visible nose resists yellowing and embrittlement across UK facade service conditions.
- Single-pass embedment — no plugs, no wall fixings, no intermediate cure; the bead sets into the basecoat strip in one trowel pass.
Technical Specifications — Corner PVC Render Bead with Mesh Data Sheet
| Property | Value |
|---|---|
| Length | 2,500 mm (2.0 m also available) |
| Arm dimensions | 21.5 × 21.5 mm |
| Internal angle | 88° (springs to 90° in service) |
| Mesh weight | 145 g/m² |
| Mesh width per wing | 100 mm |
| Mesh overlap tail | 100 mm at one end |
| Mesh type | Alkali-resistant E-glass, coextruded bond |
| PVC material | Alkali-resistant lead-free uPVC, UV-stabilised |
| Application temperature | +5 °C to +30 °C (air and substrate) |
| Pack | 50 pcs (trade pack) |
Values confirmed against the Retek manufacturer datasheet (item 1650400122) linked in the Technical Documentation section. Confirm the current TDS against the specific basecoat system for warranty-critical or BBA-governed installations.
How This Corner Bead Installs in a Render or EWI System
The manufacturer specifies a continuous basecoat strip at least 100 mm wide down each face of the corner before the bead is offered up, so the screed pushes through every mesh perforation and fully encapsulates both wings.
- Step 1 — Butter the corner. Apply a continuous 100 mm-wide basecoat strip down each face of the arris.
- Step 2 — Embed the bead. Press the PVC nose to the corner so basecoat squeezes through the mesh perforations; check verticality every metre with a long level.
- Step 3 — Trowel the wings flat. Smooth basecoat over the wings so no mesh pattern shows at finish-coat stage.
- Step 4 — Lay field mesh under the wings. Tuck Ceresit CT325 160 g/m² fibreglass mesh under the wings while the basecoat is wet, minimum 100 mm overlap.
- Step 5 — Reinforce joints. Butt cut ends gap-free; bridge each join with a 250 × 250 mm mesh patch, and trim with bead-cutting scissors rather than tin snips.
For the full corner sequence across a whole elevation — reveal detailing, joint logic, and mesh layup order — our step-by-step corner bead installation guide for UK installers covers each stage with detail from working sites.
Pro Tips From UK Installers Using This Corner Bead
The most common external-corner failure isn't a defective bead — it's a starved wing. These points come from installers working EWI retrofits and new-build elevations with Renders World stock.
- Continuous bed before the bead. Adhesive dabs leave the wings on top of the basecoat rather than inside it; the first real thermal cycle prises them free.
- Work corners in shade on graphite EPS. Dark insulation heats fast, and a basecoat that skins before embedment won't bond the reinforcement.
- Match field mesh to exposure. Pair these 145 g/m² wings with 160 g/m² field mesh for genuine continuity across the corner-to-field overlap zone.
- Order one length per storey-height corner, adding 5–10% for cuts, joint patches, and the occasional length lost in transit.
How This Bead Compares to Sibling Corner Profiles
| Variant | Key Spec | When to Choose |
|---|---|---|
| Corner PVC Bead with Mesh 2.5m | 145 g/m² wings · coextruded | Default external EWI and thin-coat corners |
| 6 mm PVC Corner Bead No Mesh | 6 mm · no wings | Confined angles, wet plaster, no mesh room |
| Aluminium Corner Bead 3.0m | 3,000 mm · rigid metal | High-impact plinths and commercial faces |
Choose this mesh-wing PVC bead wherever a 100 mm wing can be embedded each side into a thin-coat or EWI basecoat. Where the geometry curves — arched heads and radiused reveals — the PVC arched corner bead with mesh is the correct selection rather than forcing this rigid 88° profile.
Is This Corner Bead Right for Your Project?
- Best for: external 90° vertical corners on EWI (EPS, graphite EPS, XPS, mineral wool, cement board) and direct thin-coat render on masonry.
- Compare variants: use the sibling comparison above to route to a no-mesh, aluminium, or arched profile if this coextruded bead isn't the exact fit.
- Not for horizontal terminations: the datasheet specifies against use on lintels and plinth bases where water can track — plan bellcast or drip profiles there, and see our guide to render detailing around windows and doors.
FAQ — Corner Bead Coverage, Compatibility, Application
How many corner beads do I need per corner?
One 2.5 m length covers a full storey-height corner with a small cut at the head; for 2.6 m storey heights, allow one bead and trim 100 mm. For taller elevations, butt two lengths gap-free and reinforce the joint with a 250 × 250 mm mesh patch. Budget the patch pieces within the same field-mesh order and add 5–10% across the corner schedule for cuts and waste.
Can I use this bead on the plinth or at lintel level?
The Retek datasheet specifies against using mesh-wing corner beads on horizontal edges such as plinths and lintels where water can track. The profile provides no drainage path for horizontal flow, and moisture retained behind the wings can cause staining and freeze-thaw damage. Bellcast or plinth-specific drip profiles are the correct selection for horizontal terminations.
Does the mesh wing replace the field reinforcement mesh?
It supplements rather than replaces it. The 100 mm wings reinforce the immediate corner zone, and the field mesh tucks under those wings so the corner ties into the wider reinforced layer. Both must be present and encapsulated within the same basecoat application for the system to perform as a continuous composite reinforcement plane.
Will the PVC arris discolour under UV after rendering?
Only the narrow PVC arris stays visible once the system is rendered, and the lead-free uPVC is UV-stabilised for facade service life. The mesh wings sit fully buried in the basecoat where UV is not a factor, so long-term colour stability at the visible arris is reliable under normal UK conditions.
What is the installation temperature range?
Install between +5 °C and +30 °C for both air and substrate — the same conditions the basecoat requires. Avoid embedding beads under direct sunlight onto hot insulation, and protect freshly embedded corners from rain until the basecoat reaches full set, as specified in the Retek datasheet.
Technical Documentation — Corner PVC Bead with Mesh TDS