Arch Beads

Achieve perfectly curved and arched render finishes with our flexible arch beads designed for both internal and external applications.

Arch Beads – Flexible Profiles for Curved and Arched Finishes

Arch beads are essential accessories when working with thin coat render systems or dry lining applications where curved or decorative profiles are required. Whether you're creating soft arched forms above windows, curved soffits, or bespoke architectural features, our beads allow you to create curves smoothly and with precision. Built to prevent cracking, protect edges and provide a clean finish, arch beads are ideal for use across masonry and plasterboard substrates.

What are arch beads and why are they used?

Arch beads are flexible profiles designed to shape and support curved render and plaster finishes. They help form consistent curves, reinforce vulnerable edges, and reduce the risk of impact damage. In traditional and modern builds, they are used to form arches, rounded openings, and decorative plaster requirements where a standard angle bead cannot be used. Their clever design allows installers to cut and bend the bead to suit virtually any radius, making them highly suitable for both internal and external wall builds.

Benefits of using arch beads in external wall insulation

Using arch beads within EWI and rendering systems provides several benefits, including: Supports smooth curved finishes without cracking Reinforces weak points and prevents edge damage Helps form consistent, professional details around arches and openings Compatible with thin coat render systems Designed to fit seamlessly with insulation and render layers Makes installation quick and easy Their flexibility ensures installers can easily adapt the bead for bespoke curves, ensuring a high-quality finish every time.

Types of arch beads available at EWI Store

We stock a selection of arch bead profiles to suit a range of project specifications, finishes and application styles.

uPVC arch beads – durable and easy to shape

Our uPVC arch beads provide long-lasting flexibility, corrosion resistance, and a clean white finish. They are designed to bend smoothly without kinking, making them ideal for forming curved render edges and producing perfect decorative profiles.

Metal arch beads – strong support for precision edges

Metal arch beads offer strong reinforcement where more structural rigidity is required. Manufactured to BS standards, these profiles provide excellent durability for high-traffic areas and are available in multiple length and size options.

Flexible corner beads – perfect for curved and arched surfaces

Flexible corner beads combine adjustability with support, giving installers the freedom to achieve even the most complex curved openings. These beads are used frequently in dry lining and masonry work where flexibility and precision are key.

How to install arch beads for a smooth curved render finish

To install arch beads: Measure the radius and cut the bead to the required size Fix into place using approved adhesives or mechanical fixings depending on the substrate Ensure the bead sits flush with insulation and render build-up Apply basecoat and embed reinforcing mesh After drying, apply your finishing coat for a smooth, consistent curve Always follow manufacturer details and project specification to ensure performance and prevent cracking or movement.

Buy high-quality arch beads online at EWI Store

Shop our full range of arch beads and corner profiles online at EWI Store. We hold strong stock levels and offer fast delivery options nationwide. Simply click, add items to your basket, enter your postcode to view delivery time, and place your order. You can also collect your items in-store if preferred. Pricing is shown ex VAT and inc VAT, and we offer pack and single-bead purchase options. 

If you need assistance choosing the right bead, or want to check stock or delivery lead times, contact our team — we’re always happy to help.