Repair Systems — 03 — Facade & External Envelope
Remedial cavity wall ties — mechanical expansion
Technical product reference for mechanical expansion cavity wall tie systems for masonry facade remediation on Australian Class 2 strata buildings. Covers stainless 316 expansion anchor tie systems for use in solid brick or dense block backing walls where mechanical interlock is achievable — not suitable for hollow, perforated or friable masonry substrates.
Mechanical expansion tie types
Select the mechanical expansion tie type below to compare individual suppliers, technical data, and procurement sources. Solid dense masonry substrates only. Structural engineer specification and supervision is required for all cavity wall tie remediation.
Wedge Expansion Tie
Cone-wedge expansion tie for solid masonry — no grout or resin required, immediate load transfer. Suitable for dense clay brick, calcium silicate, and concrete block. Helifix, Ancon, Simpson.
Sleeve Torque-Control Tie
Bolt-tightened sleeve expansion anchor — torque is the key installation control parameter. Wider availability than specialist cavity tie products. Rawlplug, Würth, Hilti HSA-R2.
Undercut Expansion Tie
Highest-load mechanical anchor — locks into an undercut profile for bearing-based load transfer. Specialist tooling required. Engineer-specified for most demanding applications only. Hilti HDA, Fischer FAZ II.
Disclaimer
This page provides general technical information only. Mechanical expansion cavity wall tie remediation is structural work — tie type, length, spacing and pull-out performance must be designed and certified by a structural engineer against project-specific conditions and AS 3700.