Repair Systems — 03 — Facade & External Envelope
Head flashing — stainless steel
Technical product reference for stainless steel 316 head flashing systems used in window and door frame remediation on Australian Class 2 strata buildings. Covers custom-fabricated and pre-formed stainless head flashings for masonry and rendered facade applications — the preferred head flashing material for coastal, high-exposure and long-service-life applications.
What are stainless steel head flashing systems?
Stainless steel 316 head flashings are sheet metal elements installed above window and door openings in masonry and rendered facades to deflect water away from the frame-to-wall interface. They are one of the most effective long-term solutions for preventing water ingress above windows on Australian Class 2 strata buildings — particularly in buildings where head flashings were absent from the original construction or where original galvanised or aluminium flashings have failed.
Product Reference
3 products — stainless 316 head flashing systems — scroll to view all
Custom-fabricated 316L stainless head flashing — 1.0mm
Custom-fabricated 316L stainless head flashing — 1.0mm gauge
System Description
Custom-fabricated stainless 316L head flashings at 1.0mm gauge are the standard specification for window head flashings in Australian Class 2 strata remediation. The flashing is fabricated by a local sheet metal fabricator to project-specific dimensions — including the projection length, upstand height, drip nose profile and any folded ends required for the specific window surround. 316L stainless is specified (not 304) for all exterior applications including coastal environments. The flashing is typically supplied in a mill or powder-coated finish to match the facade colour. It is fixed to the masonry or render return above the window frame with stainless 316 screws or plugs, and the back joint sealed with a compatible neutral cure silicone or PU sealant. The flashing nose must project minimum 25mm clear of the facade face to provide an effective drip edge. Confirm fabricator availability and lead time before specifying — custom flashings are not ex-stock items.
Technical Properties
- 316L stainless steel — suitable for all coastal and exterior environments
- 1.0mm gauge — standard for residential and low-rise strata head flashings
- Custom fabricated to project-specific dimensions — projection, upstand, drip nose, folded ends
Limitations
- Custom fabrication — lead time required — not ex-stock; plan ahead for fabrication and delivery
- Must be fixed and sealed correctly — back joint, end caps and all fixing penetrations must be sealed
- Minimum drip nose projection 25mm clear of facade face — do not allow render to conceal the drip nose
PROCUREMENT SOURCES
Confirm grade, profile and fabricator availability before specifying or ordering.
Custom-fabricated 316L stainless head flashing — 1.2mm heavy gauge
Custom-fabricated 316L stainless head flashing — 1.2mm heavy gauge
System Description
Heavy-gauge 1.2mm 316L stainless head flashings are specified where wider window openings, high-wind-exposure or elevated building locations require increased flashing rigidity. The heavier gauge reduces mid-span deflection over wider window openings, preventing water ponding on the flashing and ensuring positive drainage off the drip nose. Fabrication and fixing details are the same as 1.0mm flashings — 316 stainless fixings, neutral cure or PU sealant at the back joint, minimum 25mm drip nose projection. Confirm whether 1.0mm or 1.2mm gauge is required based on window width, building exposure category and wind load requirements with the project engineer. Powder coat or mill finish available — confirm colour match before ordering. TODO: owner confirm — confirm gauge selection against window width and exposure category requirements.
Technical Properties
- 316L stainless steel — suitable for all coastal and exterior environments
- 1.2mm heavy gauge — reduced deflection over wider window spans
- Custom fabricated to project-specific dimensions
Limitations
- Higher cost than 1.0mm gauge — confirm whether heavier gauge is required for the project
- Custom fabrication — lead time required — confirm availability before specifying
- All fixings and sealant must match 316 stainless specification
PROCUREMENT SOURCES
Confirm grade, profile and fabricator availability before specifying or ordering.
Pre-formed 316 stainless Z-profile head flashing section
Pre-formed 316 stainless head flashing section — ex-stock
System Description
Pre-formed 316 stainless steel Z-profile or hook-nose head flashing sections are available ex-stock from some Australian roofing and flashings supply companies. These sections are roll-formed in standard profiles and supplied in lengths (typically 2400mm or 3000mm) to be cut to length on site. They are suitable where the standard profile matches the project window reveal depth and projection requirement. Unlike custom fabricated flashings, pre-formed sections do not require fabricator lead time — they can be ordered from a flashings supplier and cut to length on site. However, pre-formed profiles are limited to standard shapes and may not accommodate all window reveal geometries. End caps must be fabricated or cut and folded on site. Confirm 316 grade (not 304) before ordering — some pre-formed sections are 304 grade and may not meet the coastal specification. TODO: owner confirm — confirm 316 grade, profile dimensions and Australian supplier availability before specifying.
Technical Properties
- Pre-formed stainless Z-profile — available ex-stock from some Australian suppliers
- Cut to length on site — no fabricator lead time required
- Suitable for standard reveal depths where the profile matches the project requirement
Limitations
- Limited to standard profiles — does not accommodate non-standard reveal depths without modification
- Confirm 316 grade before ordering — 304 is not suitable for coastal locations
- End caps and folded ends require site fabrication — confirm trade capability before using pre-formed sections
PROCUREMENT SOURCES
Confirm grade, profile and fabricator availability before specifying or ordering.
System Comparison
Side-by-side comparison of stainless 316 head flashing systems. Confirm grade, profile and fabricator availability before specifying.
| Product system | Type | Grade | Finish | Coastal | Span | Primary use |
|---|---|---|---|---|---|---|
| 316L stainless — 1.0mm custom | Custom fab | 316L | Powder coat / mill | Yes | Standard spans | Standard residential / low-rise strata window head flashing — most common specification |
| 316L stainless — 1.2mm heavy | Custom fab | 316L | Powder coat / mill | Yes | Wide / high-exp spans | Wider windows, high-exposure or elevated locations requiring increased rigidity |
| Pre-formed Z-profile 316 | Pre-formed | 316 (confirm) | Mill | Confirm grade | Standard profile only | Standard reveals where profile matches — no fabricator lead time — confirm AU stock |
Critical notes for stainless head flashing specification:
- Always specify 316 stainless steel (not 304) for exterior coastal and marine-influenced environments — 304 is susceptible to surface staining and pitting in salt-laden air
- Head flashings must be installed with a positive drip edge that projects minimum 25 mm clear of the facade surface to prevent water tracking back under the flashing
- Back-of-flashing upstand must be sealed to the facade before render or coating application — sealant joint at back is a critical waterproofing detail
- Do not fix stainless flashings with carbon steel or galvanised fasteners — use 316 stainless screws only to avoid bimetallic corrosion staining
- Stainless flashings are typically factory powder-coated to match facade colour for render over applications — confirm colour match with fabricator before ordering
- Where flashings are concealed by render, ensure the flashing nose protrudes below the render finish line — concealed nose flashings defeat the purpose of the flashing
Disclaimer
This page provides general technical information only. Head flashing details are project-specific — final fabrication dimensions, fixing details and substrate preparation must be confirmed by a qualified remedial practitioner against site conditions and applicable standards.