Description
This 3mm beading is a Bella Plast BP22 stop bead: a white PVC profile with a 3 mm edge and a glass-fibre mesh wing, sold in 2.5 m lengths. It is made for external wall insulation systems finished in thin-coat render, where the coat has to stop on a clean, straight line. It is the shallowest bead in the Renders World stop bead range.
What This 3mm Beading Is
BP22 is the Bella Plast code for PVC stop beads with mesh. The maker describes them as beads for finishing thin-coat render on an insulated facade, and for dividing one render from another where the colour or the grain changes. The render is ruled off against the edge of the profile, so the line of the finish follows the line of the bead.
- Edge height: 3 mm, the smallest of the four BP22 sizes (3, 6, 10 and 15 mm).
- Length: 2500 mm, which is the BP22 L250 version; the maker also makes a 2000 mm length, which is not in the range.
- Mesh wing: glass-fibre building mesh of at least 145 g/m², 100 mm wide.
The body is rigid PVC with plasticisers added for mechanical resistance and UV stabilisers against sunlight.
The listing itself names no maker. The shop's earlier address for this item was bp22-l250-3mm-pvc-render-stop-bead, and it now leads here; the Bella Plast code in that address, the 3 mm size, the 2.5 m length and the mesh wing all agree, so the maker's data sheet is the source for the figures above.
Where a 3 mm Bead Belongs
Bella Plast places BP22 wherever a thin-coat render has to stop on an external wall insulation system built on EPS or mineral wool boards. Where exactly the beads run is a decision for the facade designer, and the maker states that they are for the outside of the building.
The size follows from the fitting instructions:
- The maker's rule: the render is finished at the edge of the bead, and the coat must not be thicker than the height of the render stop on the profile.
- For this bead: the 3mm beading suits a finishing coat no more than 3 mm thick at that edge.
Measure the render you intend to use at the edge itself before ordering.
3 mm or 6 mm With Mesh
The range has two stop beads with a mesh wing, and they differ only in the height of the edge:
| Bead | Edge height | Length | Mesh wing |
|---|---|---|---|
| This bead | 3 mm | 2.5 m | Yes, 100 mm |
| 6 mm stop bead with mesh | 6 mm | 2.5 m | Yes, 100 mm |
Pick the one whose edge matches the finishing coat. A coat thicker than 3 mm at the edge would stand above this bead, so a thicker finish takes the 6 mm bead. The range also holds plain profiles without a wing: the 6 mm stop bead without mesh and the 10 mm and 15 mm stop beads.
How Bella Plast Says It Is Fitted
The bead goes on during the reinforcing stage, not after it. The maker's sequence:
- Adhesive: spread an adhesive intended for glass mesh, EPS or wool evenly over the boards with a trowel, no thicker than 2.5 mm.
- Bead mesh: press the bead's own mesh into the adhesive.
- System mesh: straight away cover it with the facade reinforcing mesh, lapped 10 cm over the bead's mesh, in the same gluing operation, so both meshes end up in one layer of adhesive.
Once the adhesive is dry and primed, the render goes on evenly and is finished at the edge of the bead. A continuous layer of the system facade mesh must also run beneath the bead. Polyurethane foam must not be used to fix it. The profile can be cut with shears for plastics or a fine-tooth saw; because of the glass mesh, Bella Plast calls for protective gloves and eye protection. For a mesh to lap over the wing, the range includes Ceresit CT 325 fibreglass mesh. The method around an opening is set out in the stop bead fitting guide and in render detailing at windows and doors, and the guide to which render bead for which detail shows where each profile goes on a wall.
Heat, Solvents and Storage
- Surface temperature in use: no higher than 52 °C measured on the outer surface of the bead; the maker also states the profile is not resistant above +60 °C.
- Chemicals: it does not react with solid building materials on site and resists ageing, but organic solvents such as acetone and benzene attack it.
- Storage and transport: dry, cool, on a flat surface, between 0 °C and 50 °C, stacked no more than 30 layers high for the 3 mm and 6 mm sizes.
Bella Plast packs BP22 in cartons of 25 pieces; the 3mm beading is sold here as single 2.5 m lengths.
How Many Lengths an Edge Takes
List every edge where the render stops and divide each one by 2.5 m, rounding up:
- a 2.5 m edge takes one length;
- a 7 m edge takes 7 ÷ 2.5 = 2.8, so three lengths;
- the head and both sides of an opening are three separate edges.
The maker's length tolerance is ±5 %, so measure the lengths on site before cutting the last piece of a run.
What the Data Sheet Does Not Give
The Bella Plast sheet gives the sizes, the mesh and the method. Two things it does not give:
- Profile dimensions: no flange width or hole size as figures.
- UK paperwork: it refers to Polish national documents, not to a UK certificate.
Where a specification asks for either, ring 023 8200 2442 before the order goes in.
Ordering, Delivery and Returns
Renders World processes orders the same day when the stock is there. Put the beads in the same basket as the mesh and render they are fitted with.
- Delivery: quoted by the team after the order; parcels up to 25 kg go next day, always kerbside.
- Collection: from the counter at Unit 9A, Central Trading Estate, Southampton SO14 5JP, Monday to Friday 7am to 5pm and Saturday 7am to 12pm.
- Returns: goods bought directly from Renders World can go back within 14 days in their original condition; special orders and promotion purchases are excluded.
FAQ
Who makes this 3mm beading?
Bella Plast of Poland. It is their BP22 PVC stop bead with mesh in the 3 mm, 2500 mm version.
What render thickness is 3mm beading for?
A finishing coat no thicker than 3 mm at the bead. The maker's rule is that the render must not rise above the height of the bead's edge.
Does its mesh replace the reinforcing mesh?
No. A continuous layer of the system mesh runs under the bead, and the system mesh is lapped 10 cm over the bead's own mesh in the same layer of adhesive.
Can it be fixed with expanding foam?
No. Bella Plast does not allow polyurethane foam for fixing BP22; it is bedded in the reinforcing adhesive.