Repair Systems — 03 — Facade & External Envelope
Cavity flashing — lead
Technical product reference for lead cavity flashing systems for masonry facade remediation on Australian Class 2 strata buildings. Covers code-weight and heavy-duty sheet lead cavity flashings for installation above lintels, at sill courses and at base of cavity. Lead is the traditional cavity flashing material, valued for its formability and long service life in masonry applications — it remains the reference material for complex profile flashings and heritage restoration work.
Lead cavity flashing codes
Select the lead code below to compare individual suppliers, technical data, and procurement sources. Code selection is determined by application, cavity width, and exposure classification.
Code 4 Milled Lead Flashing
1.8mm, 20 kg/m² — standard lead code for cavity flashing above lintels, at sill courses, and at the base of cavity in standard residential and low-rise strata applications.
Code 5 Milled Lead Flashing
2.24mm, 25 kg/m² — standard parapet-level lead code. Specified by engineers for exposed horizontal ledges, wide-cavity applications, and coastal locations where Code 4 is insufficient.
Code 6 Heavy Duty Lead Flashing
2.65mm, 30 kg/m² — for the most demanding applications: parapet copings on exposed coastal buildings and engineer-specified locations requiring maximum fatigue resistance and service life.
Disclaimer
This page provides general technical information only. Lead cavity flashing specification, profile, thickness, lap and weep hole spacing must be confirmed against the project's exposure classification, masonry type and AS 3700 requirements. OH&S and licensing obligations for lead work must be confirmed with the relevant jurisdiction authority.