Repair Systems — 03 — Facade & External Envelope
Movement & expansion beads
Technical product reference for movement and expansion beads used at render control joints on Australian facade remediation projects. Covers aluminium and PVC profiles, control joint requirements, movement capacity, and selection for coastal environments.
What are movement and expansion beads for render?
Movement and expansion beads are installed at render control joints to accommodate thermal expansion, contraction, and structural movement within the render plane, preventing uncontrolled cracking at panel joints, substrate changes, and building expansion joints.
Product Reference
3 products — movement and expansion beads for render control joints — scroll to view all
Rondo Aluminium Movement / Expansion Bead
Aluminium movement / expansion bead — render control joint
System Description
Rondo aluminium movement beads are installed at render control joints to accommodate thermal and structural movement within the render plane at panel joints, substrate changes, and locations where differential movement is anticipated. The bead consists of two render-keying flanges separated by a flexible central section or gap that allows render on each side to move independently. Confirm profile dimensions, movement capacity, and available materials with Rondo. TODO: owner confirm — Rondo aluminium movement bead specification, movement capacity and profile dimensions.
Technical Properties
- Aluminium movement bead — two flanges with flexible or open central section
- Accommodates thermal and structural movement at render control joints
- Suitable at panel joints, substrate changes, and building expansion joints
Limitations
- Aluminium not suitable for coastal environments without PVC or stainless alternative
- TODO: owner confirm — Rondo movement bead specification and movement capacity
- Not suitable for structural movement joints — for large structural movement a cover plate system is required
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
USG Boral Aluminium / PVC Movement Bead
Aluminium or PVC movement / expansion bead
System Description
USG Boral / Beadex supplies aluminium and PVC movement beads for render expansion and control joints. Confirm material, profile, and movement capacity with USG Boral for each application. TODO: owner confirm — USG Boral movement bead specification, material options and dimensions.
Technical Properties
- Aluminium or PVC movement bead
- Render control and expansion joints
- Confirm movement capacity and profile from USG Boral
Limitations
- TODO: owner confirm — USG Boral movement bead specification
- Aluminium not suitable for coastal — specify PVC
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Trade-Supply PVC Movement / Expansion Bead
PVC movement / expansion bead — render control joint
System Description
PVC movement and expansion beads are available through render merchants and builders suppliers nationally. PVC is preferred in coastal environments. Confirm profile dimensions, movement capacity, and UV stabilisation (for external applications) from the supplier.
Technical Properties
- PVC — corrosion-resistant
- Render movement and control joints
- Trade supply — widely available
Limitations
- Confirm UV stabilisation for exterior exposed applications
- Confirm movement capacity — PVC may have different movement capacity than aluminium versions
- Not suitable for large structural movement joints
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Side-by-side comparison of movement and expansion bead products. Confirm all product selections against the current manufacturer TDS before specifying.
| Product | Brand | Material | Profile type | Movement capacity | Coastal | Primary use |
|---|---|---|---|---|---|---|
| Rondo Aluminium Movement Bead | Rondo | Aluminium | Two-flange — confirm from Rondo | Confirm from Rondo | Not suitable — use PVC | Panel joints, substrate changes, control joints |
| USG Boral Movement Bead | USG Boral / Beadex | Aluminium or PVC | Confirm from USG Boral | Confirm from USG Boral | PVC suitable — aluminium not suitable | Render expansion and control joints |
| Trade-Supply PVC Movement Bead | Trade Supply | PVC | Various — confirm from supplier | Confirm from supplier | PVC suitable for coastal | Render control joints — substrate changes and panel joints |
Do not confuse movement and expansion beads with:
- Render stop beads — terminate render at edges without movement capacity — used at render terminations, not control joints
- Expansion joint cover plates — structural cover plates for large structural expansion joints — different product class from render beads
- Arris corner beads — protect external render corners — no movement capacity
- Control joint sealants — sealant applied within a formed joint — no bead profile
Disclaimer
This page provides general technical information only. Final product selection must be confirmed against the current manufacturer technical data sheet, project specification, substrate condition, exposure classification, AS 3700, NCC requirements, and applicator warranty conditions. Products marked TODO: owner confirm require verification before specifying. Do not rely on this reference as a substitute for professional engineering or facade consultant advice.