Repair Systems — 03 — Facade & External Envelope
Mill finish aluminium cavity flashing
Supplier reference for mill finish aluminium cavity flashing for masonry facade remediation on Class 2 strata buildings. Covers 1.2–2.0mm 1100-H14 and 3003-H14 alloy strip from national distributors and local fabricators — the most common aluminium flashing type for new and remedial cavity construction in Australia.
What is mill finish aluminium cavity flashing?
Mill finish aluminium is the standard specification for cavity flashing in most Australian masonry remediation projects — unpainted bare alloy in 1.2–2.0mm thickness, formed with drip edge, upstand, and weep former slots per AS 3700 requirements. Supplied as coil or pre-cut lengths by aluminium distributors, or as pre-profiled strips by specialist flashing suppliers.
Product Reference
4 products — 4 suppliers — mill finish aluminium cavity flashing — scroll to view all
Capral Mill Finish Aluminium Cavity Flashing
Mill finish aluminium flashing — coil and cut length supply
System Description
Capral Aluminium supplies mill finish aluminium strip in standard thicknesses (1.2mm, 1.6mm, 2.0mm) used as cavity flashing in masonry remediation — typically supplied to metal fabricators who form the flashing profile on site or in workshop. Mill finish aluminium is the standard specification for most cavity flashing applications — unpainted alloy 1100 or 3003 extrusion or rolled strip with standard folding and forming characteristics. Supplied in coil or pre-cut sheet lengths; fabricators form drip lips, weep former slots, and upstand returns to suit specific cavity dimensions. Available nationally through Capral's distribution network. Confirm current alloy, thickness availability, and pricing with local Capral branch before specifying.
Technical Properties
- Finish: mill finish (bare alloy) — unpainted, natural oxidised surface forms over time in service
- Thickness: 1.2mm / 1.6mm / 2.0mm — confirm minimum 1.2mm for structural cavity flashing with project engineer
- Alloy: 1100 or 3003 — standard rolling and folding grades suitable for brake-press profile formation
Limitations
- Mill finish aluminium will oxidise over time — not suitable where aesthetics of the exposed drip edge are important
- Dissimilar metal contact with steel fixings will cause galvanic corrosion — use stainless or aluminium fixings only
- Fabrication to correct profile required — do not install flat sheet without forming correct drip lip and upstand
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Metalcraft Mill Finish Aluminium Flashing Strip
Mill finish aluminium flashing — pre-profiled supply
System Description
Metalcraft supplies mill finish aluminium flashing in standard profiles and cut lengths for masonry remediation — supplied as pre-cut strips with standard drip edge, upstand, and weep former configurations. Pre-profiled supply eliminates on-site fabrication requirements, providing consistent cavity flashing profiles for contractor installation. Standard profiles suit most residential cavity masonry configurations — custom profiles available for non-standard cavity widths. Available through Metalcraft's national supply network with technical guidance for flashing specification. Confirm available profiles, lead times, and custom profile options with Metalcraft before scheduling installation.
Technical Properties
- Finish: mill finish (bare alloy) — no coating applied
- Thickness: 1.2mm / 1.6mm standard — confirm minimum thickness with engineer for structural applications
- Supply form: pre-cut profiles with standard drip edge, upstand, and weep former geometry
Limitations
- Mill finish will show oxidation over time — confirm finish acceptability for exposed drip edge locations
- Pre-profiled lengths are non-adjustable — confirm cavity dimensions before ordering
- Lead times for custom profiles — confirm with Metalcraft before scheduling installation works
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Stramit Aluminium Flashing Strip
Mill finish aluminium flashing — standard and Colorbond profiles
System Description
Stramit Building Products supplies aluminium flashing strip in mill finish and other finishes for cavity flashing, parapet capping, and related masonry remediation applications. Stramit's national branch and distribution network provides broad contractor access to aluminium flashing products without requiring specialist fabricator engagement. Standard profiles are available for common cavity widths and parapet details — custom profiles and cut-to-length service available through Stramit branches. Note: Stramit's 0.9mm product is below the minimum recommended thickness for structural cavity flashing — confirm 1.2mm minimum with project engineer.
Technical Properties
- Finish: mill finish or Colorbond coated — confirm finish with local Stramit branch
- Thickness: 0.9mm / 1.2mm standard — confirm 1.2mm minimum for structural cavity flashing with engineer
- Supply form: cut lengths or coil — cut-to-length service available at Stramit branches
Limitations
- 0.9mm is below minimum recommended thickness for structural cavity flashing — confirm 1.2mm minimum with engineer
- Mill finish will oxidise in coastal and high-humidity environments — consider powder coat for marine zones
- Custom profiles require lead time — confirm availability with local Stramit branch before scheduling
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Local Aluminium Fabricators — Custom Cavity Flashing
Custom mill finish aluminium flashing — fabricated to engineer specification
System Description
Local aluminium fabricators produce custom cavity flashing to engineer or architect drawings for non-standard cavity configurations, complex parapet details, and heritage applications. Fabricators can produce one-off or short-run cavity trays, weep formers, and flashing profiles to exact site dimensions — the preferred approach for complex remediation projects. Fabricators source aluminium strip from national distributors (Capral, Metalcraft) and form profiles using brake press or folder equipment. Cost-effective for small quantities or complex profiles that don't suit standard catalogue items. The project engineer or remedial practitioner must provide dimensioned drawings — fabricators do not design cavity flashing geometry.
Technical Properties
- Finish: mill finish standard — confirm with fabricator if other finish is required
- Thickness: 1.2–2.0mm to engineer specification — confirm minimum 1.2mm for structural applications
- Supply form: custom to engineer drawings — dimensioned drawings must be provided by project practitioner
Limitations
- Quality varies by fabricator — check fabricator capability before engaging for critical flashing profiles
- Lead time for custom fabrication must be allowed in programme — do not leave to last minute
- Engineer or remedial practitioner must provide dimensioned drawings — fabricators do not design cavity flashing
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Side-by-side comparison of mill finish aluminium cavity flashing suppliers. Confirm all product selections with current supplier TDS before specifying.
| Supplier | Product | Thickness | Finish | Supply form | Distribution | Key feature | Primary use |
|---|---|---|---|---|---|---|---|
| Capral Aluminium | Mill Finish Strip | 1.2–2.0mm | Mill finish | Coil / cut length | National | Standard alloy — fabricator supply | Fabricator-sourced flashing material |
| Metalcraft Industries | Pre-cut Profiled Strip | 1.2–1.6mm | Mill finish | Pre-profiled lengths | National | Pre-profiled — no site fabrication required | Standard cavity flashing profiles |
| Stramit Building Products | Aluminium Flashing Strip | 0.9–1.2mm | Mill finish / Colorbond | Cut lengths / coil | National branches | Broad branch availability | Contractor-procured standard flashing |
| Local Fabricators | Custom Cavity Flashing | 1.2–2.0mm to spec | Mill finish | Custom to drawings | Local | Non-standard configurations to engineer drawing | Complex details and heritage remediation |
Do not confuse mill finish aluminium flashing with:
- Powder coated aluminium flashing — same alloy but with factory-applied colour coating for exposed applications — listed on the powder coated aluminium flashing page
- Profiled aluminium cavity tray — factory-formed or extruded tray profile with integral weep former geometry — different product, listed on the profiled cavity tray page
- Lead flashing — heavier, fully workable and self-sealing at laps, but requires Code 4/5/6 selection and separate weep formers — listed on the cavity flashing — lead page
- Alcore composite flashing — bitumen-aluminium laminate, self-healing at mechanical damage, different thermal performance — listed on the cavity flashing — Alcore page
- Colorbond steel flashing — Stramit and others supply Colorbond-finish strip that is often grouped with aluminium flashing products — confirm alloy type when specifying
Disclaimer
This page provides general technical information only. Flashing type, alloy, thickness, lap detail, and weep former spacing must be confirmed by a qualified remedial practitioner and, for structural masonry, a structural engineer, against project-specific conditions and AS 3700.