Repair Systems — 03 — Facade & External Envelope
Storm angle — stainless steel
Technical product reference for stainless steel 316 storm angle systems used in window and door frame remediation on Australian Class 2 strata buildings. Covers 316 stainless storm angles for coastal, marine-influenced and high-exposure applications — specified where aluminium angles are insufficient for the corrosion environment and long service life is required without recoating.
What are 316 stainless storm angle systems for windows?
316 stainless steel storm angles are the correct specification for window and door frame perimeter protection in coastal and marine-influenced environments where aluminium angles would corrode over the design life of the remediation. Grade 316L stainless provides the corrosion resistance necessary for salt-laden coastal air, saline groundwater splash and high-humidity marine environments where 304 stainless and aluminium are inadequate.
Product Reference
3 products — 316 stainless storm angle systems — scroll to view all
316L stainless equal angle — 50×50×3mm storm angle
316L stainless equal angle — coastal window storm angle
System Description
316L stainless steel 50×50×3mm equal angle is the correct specification for window storm angles in coastal and marine-influenced environments where aluminium angles will corrode at cut edges and fastener points in salt-laden air. The 316L grade (low carbon) provides improved weld corrosion resistance over standard 316. Angles are cut to length from standard bar stock and fixed to masonry or frame with 316 stainless screws — all fixings must also be 316 stainless to prevent bimetallic corrosion. Top and end joints sealed with a compatible neutral cure silicone or low-modulus sealant. 316 stainless has a slightly different appearance to aluminium and will patina over time in coastal environments — confirm the finish requirement with the client. In some locations a brushed or passivated finish is specified. Stainless angles are heavier to handle than aluminium and harder to cut cleanly without appropriate tools — factor this into labour costs. Confirm 316 (not 304) grade with the supplier before ordering — 304 is not suitable for coastal applications. All fixings must be 316 stainless.
Technical Properties
- 316L stainless steel equal angle — 50×50×3mm standard section — coastal grade
- Grade 316L (low carbon) — improved weld and crevice corrosion resistance over 304
- Ex-stock from steel distributors — cut to length on site or in workshop
Limitations
- Confirm 316L not 304 grade with supplier before ordering — 304 is inadequate for coastal use
- Stainless angles are harder to cut than aluminium — angle grinder with stainless-rated disc required
- Will patina over time in coastal environments — confirm finish and appearance requirement with client
PROCUREMENT SOURCES
Confirm grade 316L (not 304), dimensions and availability before ordering.
316L stainless unequal angle — 75×50×3mm wider coverage storm angle
316L stainless unequal angle — wider coverage coastal storm angle
System Description
316L stainless 75×50×3mm or similar unequal leg angles are used where the standard 50×50 equal angle does not provide sufficient coverage over the window frame or where the wall reveal requires a longer horizontal leg. The 75mm horizontal leg provides extended lapping over the frame or render return, improving water shedding coverage at the head or jamb. Fixed with 316 stainless screws, top and end joints sealed with compatible sealant. Specific unequal sizes in stainless may require ordering rather than being available as ex-stock — confirm availability and lead time with the supplier before specifying. Grade 316L (not 304) must be confirmed with the supplier — 304 stainless is not suitable for coastal environments. All fixings must be 316 stainless. Heavier than aluminium equivalents — factor into handling and labour costs for upper-floor work. TODO: owner confirm — confirm appropriate leg dimensions for the specific window reveal and frame geometry on each project.
Technical Properties
- 316L stainless unequal angle — longer horizontal leg for increased coverage
- 75×50mm or similar — confirm specific dimensions for each project
- Grade 316L — suitable for coastal and marine-influenced environments
Limitations
- Confirm 316L not 304 grade with supplier — 304 not suitable for coastal use
- Specific unequal sizes in stainless may not be ex-stock — confirm availability and lead time
- Harder to cut than aluminium — stainless-rated cutting disc required
PROCUREMENT SOURCES
Confirm grade 316L (not 304), dimensions and availability before ordering.
Proprietary 316 stainless storm bead / cover angle profile
Proprietary 316 stainless storm bead — coastal window application
System Description
Proprietary 316 stainless storm bead and cover angle profiles are purpose-designed extruded or roll-formed sections for coastal window storm angle applications. Unlike standard angle sections, proprietary profiles may include integral features such as a drip groove on the underside of the horizontal leg to prevent water tracking back, a sealant recess channel on the back leg, or a purpose-formed nose profile. These purpose-designed features improve weatherproofing performance over a simple angle section. Available from stainless fabricators and specialist flashings suppliers — confirm specific product, profile dimensions, grade and Australian availability before specifying. Confirm grade is 316 (not 304) — critical for coastal applications. All fixings must be 316 stainless. TODO: owner confirm — confirm specific proprietary profile, Australian availability and coastal grade before specifying.
Technical Properties
- Proprietary 316 stainless profile — purpose-designed for coastal window storm angle applications
- May include integral drip groove, sealant channel or nose profile for improved performance
- Grade 316 (confirm with supplier) — suitable for coastal and marine environments
Limitations
- Product range varies by supplier — confirm specific profile and Australian availability before specifying
- Confirm grade is 316 not 304 — critical for coastal applications
- Custom or proprietary profiles may require longer lead times than standard sections
PROCUREMENT SOURCES
Confirm grade 316L (not 304), dimensions and availability before ordering.
System Comparison
Side-by-side comparison of 316 stainless storm angle systems. Confirm grade 316L (not 304) and dimensions before ordering.
| Product system | Type | Material | Finish | Coastal | Supply | Primary use |
|---|---|---|---|---|---|---|
| 316L stainless equal angle 50×50×3mm | Equal angle | 316L stainless | Mill / passivated | Yes | Ex-stock | Standard coastal window storm angle at head, jamb or sill — most common coastal specification |
| 316L stainless unequal angle 75×50×3mm | Unequal angle | 316L stainless | Mill / passivated | Yes | Order req. | Wider coverage where standard 50×50 angle is insufficient for the reveal or frame depth |
| Proprietary 316 stainless storm bead | Proprietary | 316 stainless | Mill / passivated | Yes (confirm) | Supplier stock | Purpose-designed profiles with integral features for coastal locations — confirm AU availability |
Stainless vs aluminium storm angle — selection and installation notes:
- Always specify 316 stainless steel (not 304) for exterior applications — 304 grade is susceptible to surface rust staining in coastal and chloride-rich environments
- Stainless storm angles are the preferred specification for coastal locations within 1 km of the ocean or where buildings are exposed to salt-laden air or spray
- All fixings must be 316 stainless — do not mix fastener grades with the angle material; dissimilar metal contact can cause galvanic corrosion even with stainless angles
- Stainless is harder to cut and form than aluminium — confirm fabricator capability for non-standard angle sizes and complex mitre joints before ordering
- Sealant joints at top, ends and all penetrations must use a sealant compatible with stainless steel — confirm compatibility with the sealant manufacturer TDS
- Storm angles supplement, but do not replace, correctly installed primary perimeter sealant — both elements are required for a complete weatherproofing system
Disclaimer
This page provides general technical information only. Storm angle sizing, grade selection and fixing details must be confirmed by a qualified remedial practitioner against site conditions and exposure classification. Always verify stainless grade (316 vs 304) against the project exposure zone before ordering.