Repair Systems — 03 — Facade & External Envelope
Code 5 milled lead cavity flashing
Supplier reference for Code 5 milled lead cavity flashing (2.24mm, 25 kg/m²) for masonry facade remediation on Class 2 strata buildings. The parapet-grade lead code — specified by engineers for exposed horizontal surfaces, wide-cavity applications, and locations where Code 4 durability is insufficient.
What is Code 5 milled lead cavity flashing?
Code 5 milled lead sheet (2.24mm, 25 kg/m²) is the standard specification for parapet-level flashing on Australian masonry buildings — heavier and more fatigue-resistant than Code 4, providing greater durability at exposed horizontal ledges, wide cavities, and coastal environments.
Product Reference
2 products — 2 suppliers — Code 5 milled lead parapet and heavy-duty flashing — scroll to view all
Midland Lead Australia — Code 5 Milled Lead Sheet
Code 5 milled lead sheet — parapet and heavy-duty flashing
System Description
Midland Lead Australia's Code 5 product is the standard specification for parapet-level flashing on Australian masonry buildings. At 2.24mm and 25 kg/m², it provides increased resistance to fatigue and thermal movement compared to Code 4. Supplied in 3m and 6m rolls in standard cavity flashing widths. The leading UK-origin lead product in the Australian market, available through plumbing and building materials merchants nationally. Confirm current stock widths, roll lengths, and pricing with local merchant before specifying.
Technical Properties
- Code: Code 5 — parapet and heavy-duty cavity flashing grade
- Thickness: 2.24mm
- Weight: 25.40 kg/m²
Limitations
- Heavier than Code 4 — 25 kg/m² — confirm delivery and handling logistics for high-level parapet work
- Not suitable for direct contact with zinc-coated or galvanised steel without isolation strip
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Austral Lead — Code 5 Milled Lead Sheet
Code 5 milled lead sheet — Australian supply
System Description
Austral Lead supplies Code 5 milled lead sheet through plumbing and building materials merchants. Equivalent to Midland Lead Code 5 specification. Availability varies by state — confirm with local merchant before specifying. May require substitution with Midland Lead in some locations.
Technical Properties
- Code: Code 5 — parapet and heavy-duty cavity flashing grade
- Thickness: 2.24mm
- Weight: 25 kg/m²
Limitations
- Availability varies by state — confirm with local merchant before specifying
- May require substitution with Midland Lead in some locations
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Side-by-side comparison of Code 5 milled lead flashing suppliers. Confirm all product selections with current supplier before specifying.
| Supplier | Code | Thickness | Weight | Distribution | Key feature | Primary use |
|---|---|---|---|---|---|---|
| Midland Lead | Code 5 | 2.24mm | 25 kg/m² | National — Midland distribution network | Leading Australian market supplier | Parapet flashing, exposed ledges, wide-cavity |
| Austral Lead | Code 5 | 2.24mm | 25 kg/m² | Plumbing merchants — state-dependent | Australian supply chain | Parapet flashing, heavy-duty cavity |
Do not confuse Code 5 lead flashing with:
- Code 4 lead flashing (1.8mm, 20 kg/m²) — lighter grade for standard cavity applications at base of cavity and over lintels — not for parapets — listed on the Code 4 lead flashing page
- Code 6 heavy duty lead flashing (2.65mm, 30 kg/m²) — for the most demanding applications — parapet copings in exposed coastal locations requiring maximum durability — listed on the Code 6 lead flashing page
- Aluminium cavity flashing — lighter, lower cost, different thermal behaviour, not self-sealing at laps — listed on the cavity flashing — aluminium page
- Alcore composite flashing — bitumen-aluminium laminate, self-adhesive type — different material and installation method — listed on the cavity flashing — Alcore page
Disclaimer
This page provides general technical information only. Lead code selection, flashing width, lap detail, and weep former spacing must be confirmed by a qualified remedial practitioner against project-specific conditions and AS 3700.