Ember attack is one of the most important threats to consider when preparing a home for bushfire. Burning leaves, twigs and other fragments can be carried by strong winds ahead of a fire front and land on roofs, around openings and in gutters containing dry organic material.
That is why gutter maintenance and suitable gutter protection can form part of a broader bushfire-preparation strategy.
But there is an important distinction that is often lost in online advice:
A non-combustible gutter guard and an ember guard are not automatically the same thing.
Material, mesh aperture, the part of the building being protected, the property's Bushfire Attack Level (BAL) and the installation details all matter.
This guide explains what ember guards are, how the commonly discussed 2mm mesh requirement applies, how Leaf Stopper Fine Mesh differs from Standard and Premium Mesh, and when you need professional advice before selecting a system.
Key Takeaways
- Ember attack is a major cause of house ignition during Australian bushfires.
- Gutter and valley leaf guards used in bushfire-prone construction should be non-combustible where the applicable requirements call for it.
- The commonly referenced maximum 2mm aperture is particularly relevant where mesh is being used as an ember guard or to protect specified building openings.
- Leaf Stopper Fine Mesh has a 1.8mm × 1.8mm woven aperture and is the BAL-rated Mesh Shield option within the Leaf Stopper range.
- Standard and Premium Mesh are non-combustible aluminium but are not the BAL-rated Leaf Stopper mesh options.
- Do not assume aluminium Fine Mesh is suitable as an ember guard for every BAL-40 or BAL-FZ application.
- Product selection alone does not make a complete building BAL compliant.
- Gutter guard remains part of an ongoing maintenance and bushfire-preparation strategy.
What Is Ember Attack?
Embers are burning pieces of leaves, bark, twigs and other material carried by wind during a bushfire.
They may travel ahead of the main fire front and land:
- On roofs
- Inside gutters
- In roof valleys
- Against walls
- Around decks
- Near vents and openings
- On other combustible material surrounding the building
Dry leaves and twigs accumulated in a gutter can provide fuel if burning embers land among them.
For this reason, Australian bushfire-preparation advice commonly includes keeping gutters clear of combustible debris and considering non-combustible gutter protection.
A gutter guard can help reduce leaves, bark, twigs and other larger organic material entering the gutter.
It should nevertheless be considered one component of property preparation rather than a standalone bushfire-protection solution.
For a broader overview of selecting gutter protection for bushfire-prone properties, read our guide to gutter guard for fire-prone areas.
Gutter Guard vs Ember Guard: What's the Difference?
This distinction is critical.
Gutter or Valley Leaf Guard
A gutter guard or valley leaf guard is primarily designed to help reduce leaves and debris entering the drainage system.
In bushfire-prone construction, the applicable requirements may require these leaf guards to be made from non-combustible materials.
Ember Guard
An ember guard is used to help restrict burning embers from passing through a protected opening or gap.
When mesh or perforated sheet is performing this function, requirements can specify:
- Maximum aperture
- Permitted materials
- Supporting or framing material
- Installation details
- Perimeter gaps
This means a product being made from non-combustible metal does not automatically make it an ember guard for every application.
What Is the 2mm Ember Guard Rule?
You will frequently see a maximum 2mm aperture mentioned when researching bushfire mesh.
That requirement is particularly relevant when mesh or perforated sheet is used as an ember guard or to protect specified openings against ember entry.
It should not be simplified into:
"Every gutter guard on every BAL-rated home must have holes smaller than 2mm."
The requirements depend on what the mesh is doing and where it is installed.
Why Leaf Stopper Fine Mesh Is Relevant
Leaf Stopper Fine Mesh uses a 1.8mm × 1.8mm woven aperture.
That places its aperture below the commonly specified 2mm maximum used for applicable ember-guard applications.
Fine Mesh is therefore the BAL-rated Mesh Shield option within the Leaf Stopper range.
That still does not mean installing Fine Mesh alone makes a building BAL compliant.
Understanding BAL Ratings
BAL stands for Bushfire Attack Level.
The BAL assigned to a property reflects its potential exposure to bushfire attack, including factors such as ember attack, radiant heat and, at higher levels, direct flame contact.
The BAL categories include:
- BAL-LOW
- BAL-12.5
- BAL-19
- BAL-29
- BAL-40
- BAL-FZ
The construction requirements become progressively more stringent as the assessed exposure increases.
Your BAL is not determined simply by whether you live near trees.
Assessment considers factors such as:
- Vegetation classification
- Distance from vegetation
- Slope
- Site conditions
- Applicable planning and building requirements
If your gutter guard is being selected to satisfy a specific construction requirement, use the project's BAL assessment and approved documentation rather than relying solely on online product descriptions.
BAL-12.5, BAL-19 and BAL-29
Leaf Stopper Fine Mesh is the relevant Leaf Stopper mesh option where BAL-rated aluminium mesh or an applicable aluminium ember guard is required.
It has:
- 1.8mm × 1.8mm woven aperture
- 0.40mm aluminium construction
- Non-combustible material
BAL requirements should still be confirmed against the particular building element and project.
Looking Specifically at BAL 29?
BAL 29 deserves more detailed consideration because the building may be exposed to significant ember attack and radiant heat.
Rather than duplicate all of those requirements here, read the dedicated BAL 29 Gutter Guard Buying Guide.
That guide covers mesh selection, roof compatibility, maintenance and the limits of gutter guard as part of BAL 29 construction.
What Changes at BAL-40 and BAL-FZ?
Do not assume that aluminium Fine Mesh can be used as an ember guard for every building element at BAL-40 or BAL-FZ.
Higher Bushfire Attack Levels can impose more restrictive material and construction requirements on particular openings and building elements.
The distinction is especially important at BAL-FZ, where direct flame exposure is part of the assessed bushfire attack.
If your property is BAL-40 or BAL-FZ, confirm:
- The exact building element being protected
- Whether the mesh is acting as a leaf guard or ember guard
- The permitted mesh material
- The required aperture
- Any support or framing requirements
- Any perimeter-gap requirements
- Acceptance by the relevant building professional
For Flame Zone projects, read our dedicated BAL-FZ Gutter Guard Requirements Guide.
Leaf Stopper Mesh Shield Options
Leaf Stopper offers three aluminium Mesh Shield options.
Standard Mesh
- Aperture: 3.5mm × 3.5mm
- Thickness: 0.55mm aluminium
- Best suited to: General leaves, twigs and larger debris
- Material: Non-combustible aluminium
- BAL status: Not the BAL-rated Leaf Stopper mesh option
Premium Mesh
- Aperture: 3.5mm × 3.5mm
- Thickness: 0.80mm aluminium
- Difference: Approximately 46% thicker than Standard Mesh
- Material: Non-combustible aluminium
- BAL status: Not the BAL-rated Leaf Stopper mesh option
Premium Mesh is thicker than Standard Mesh. It is not a finer-aperture product.
Fine Mesh
- Aperture: 1.8mm × 1.8mm woven mesh
- Thickness: 0.40mm aluminium
- Best suited to: Pine needles, fine seeds and smaller debris
- Material: Non-combustible aluminium
- BAL status: The BAL-rated Mesh Shield option within the Leaf Stopper range
Fine Mesh therefore serves two useful purposes where applicable: it helps reduce smaller debris entering the gutter and provides the fine-aperture Leaf Stopper option for relevant bushfire applications.
Non-Combustible Does Not Mean Fireproof
Leaf Stopper Mesh Shield is manufactured from aluminium, which is classified as a non-combustible material.
That does not mean aluminium is unaffected by unlimited heat.
Avoid descriptions such as:
- Fireproof
- Ember-proof
- Cannot melt
- Guaranteed to survive a bushfire
The accurate benefit is that aluminium does not contribute combustible fuel in the same way as a combustible gutter-guard material.
The Mesh Still Needs the Correct Roof System
Choosing Fine Mesh is only one part of configuring Leaf Stopper.
The roof-side components must also match the roof profile.
CORROGUARD® — Corrugated Metal Roofs
CORROGUARD® is designed for compatible traditional curved corrugated metal roof profiles.
It uses Corrofast Saddles to secure Mesh Shield to the compatible corrugated roof.
TILEGUARD™ — Concrete and Terracotta Tiles
TILEGUARD™ is designed for compatible concrete and terracotta tiled roofs.
The installation method differs significantly from metal-roof systems.
DEK-762™
DEK-762™ is for compatible metal roofs matching the required DEK-762 geometry and uses DEKAFast saddles.
DEKGUARD® — Flat-Based Metal Profiles
DEKGUARD® is designed for supported flat-based metal roof profiles and uses patented Gripit fasteners.
COMGUARD™ — Internal Box Gutters
COMGUARD™ is designed for compatible internal box-gutter applications.
Complex internal drainage arrangements should be considered carefully so gutter protection does not obstruct sumps, outlets, rainheads or overflow provisions.
Does Ember Guard Mesh Need to Create a Completely Sealed Roof?
No gutter-guard article should reduce bushfire compliance to a claim such as:
"There can be no gaps greater than 2mm anywhere in the gutter guard system."
Gap requirements depend on the particular building element being protected and the applicable construction provision.
Good installation still matters.
Mesh should be:
- Securely installed
- Matched to the roof profile
- Free from unnecessary openings
- Supported using the appropriate system components
- Installed according to current instructions
Where a specific ember-guard or BAL requirement applies, the relevant gap and fixing requirements should come from the project documentation or applicable construction standard.
Will Fine Mesh Handle Heavy Rain?
Fine Mesh allows rainwater to pass through the woven aluminium mesh, but no gutter guard should be marketed as guaranteeing water capture during every rainfall event.
Water performance depends on several factors, including:
- Rainfall intensity
- Roof pitch
- Roof catchment
- Mesh condition
- Surface debris
- Gutter size
- Gutter fall
- Downpipe capacity
- Overflow provisions
Fine mesh can also require surface maintenance if dust, pollen or organic material begins restricting the openings.
A gutter guard cannot correct an undersized or defective drainage system.
Maintaining Gutter Protection in Bushfire-Prone Areas
Installing Fine Mesh does not remove the need to inspect your roof and gutters.
Bushfire preparation should include attention to combustible debris around the entire property.
For gutter protection, check for:
- Dry branches resting on the Mesh Shield
- Matted leaves
- Bark and other combustible material
- Debris gathered in roof valleys
- Damage from storms or falling branches
- Fine sediment inside accessible gutter sections
- Obstructed outlets or downpipes
Inspection frequency should reflect the vegetation and conditions surrounding your property.
A property beneath heavy eucalyptus or pine vegetation may need attention more frequently than a property with little surrounding tree cover.
It is particularly sensible to assess the property as part of preparation for the local bushfire season and after significant storms or heavy debris events.
For a broader explanation of what maintenance still remains after installation, read Do You Still Have to Clean Gutters with Gutter Guards?.
EasyAc® and Bushfire-Related Gutter Maintenance
EasyAc® is an optional removable access panel that can provide local access through compatible gutter guard mesh.
It may be useful for:
- Inspecting selected gutter areas
- Checking a downpipe entrance
- Looking for fine sediment
- Flushing loose local material where appropriate
However, do not assume that adding an EasyAc® automatically preserves the compliance or ember-guard performance of a particular BAL construction.
If gutter mesh is part of a project-specific bushfire construction requirement, confirm the complete configuration—including access components—with the relevant professional.
Does Fine Mesh Stop All Embers?
No product should be marketed as stopping every ember or guaranteeing that a home will survive a bushfire.
Fine Mesh provides a 1.8mm × 1.8mm non-combustible aluminium barrier and may perform an ember-guard function where its material and installation are suitable for the applicable requirements.
Bushfire exposure can also involve:
- Radiant heat
- Direct flame contact
- Burning debris
- Embers entering other openings
- Combustible landscaping
- Decks and fencing
- Windows and doors
- Roof penetrations
Gutter mesh is therefore one element of a much larger bushfire-resilience strategy.
Choosing the Right Leaf Stopper System for a Bushfire-Prone Property
A useful selection process is:
- Confirm your property's BAL and project requirements.
- Determine whether the mesh is being used as a leaf guard, ember guard or both.
- Confirm the permitted mesh material and aperture.
- Identify your exact roof profile.
- Select the correct Leaf Stopper roof system.
- Select Fine Mesh where the BAL-rated Leaf Stopper option is appropriate.
- Follow the current installation instructions.
- Plan future inspection and maintenance access.
If your property is specifically BAL 29, continue with our BAL 29 Gutter Guard Buying Guide.
For BAL-FZ properties, read the BAL-FZ Gutter Guard Requirements Guide before selecting aluminium mesh for an ember-guard application.
For general product information, visit the Leaf Stopper Bushfire Protection page.
Once you've confirmed the requirements for your property, you can shop Leaf Stopper gutter guard systems by roof type or find a Leaf Stopper installer.
Frequently Asked Questions
What is an ember guard?
An ember guard is a protective screen or similar construction used to help restrict burning embers from passing through an opening. Where mesh performs this role, requirements can specify aperture, material and installation details.
Is every metal gutter guard an ember guard?
No. Non-combustible material is important, but an ember guard can also have specific aperture, material and installation requirements.
What is the 2mm rule for ember guards?
A maximum mesh aperture of 2mm is commonly specified where mesh or perforated sheet is used to protect certain openings from ember entry. It should not be interpreted as a universal requirement for every gutter guard in every BAL application.
What is the aperture of Leaf Stopper Fine Mesh?
Fine Mesh has a 1.8mm × 1.8mm woven aperture and is manufactured from 0.40mm aluminium.
Is Leaf Stopper Standard Mesh BAL-rated?
No. Standard Mesh is non-combustible 0.55mm aluminium with a 3.5mm × 3.5mm aperture, but it is not the BAL-rated Mesh Shield option.
Is Premium Mesh BAL-rated?
No. Premium Mesh is also non-combustible aluminium but uses the same 3.5mm × 3.5mm aperture as Standard Mesh. Its main difference is its 0.80mm thickness.
Which Leaf Stopper mesh is BAL-rated?
Fine Mesh is the BAL-rated Mesh Shield option within the Leaf Stopper range.
Can Leaf Stopper Fine Mesh be used at BAL 29?
Fine Mesh is the relevant Leaf Stopper option where suitable BAL-rated aluminium mesh or an aluminium ember guard is required at BAL 29. Confirm the exact application and construction requirement for the project.
Can aluminium Fine Mesh be used as an ember guard at BAL-FZ?
Do not assume so. BAL-FZ applications can have more restrictive material requirements for certain ember-screening applications. Confirm the exact building element and permitted material with the project certifier, builder or bushfire consultant.
Does BAL-rated gutter mesh make my house bushfire-proof?
No. Gutter protection can form part of broader bushfire preparation but cannot guarantee that a building will survive ember attack, radiant heat or direct flame exposure.
Do I still need to clean gutters with Fine Mesh?
Periodic inspection remains important. Fine Mesh helps exclude smaller debris, but dust, pollen and microscopic sediment may still pass through or collect on the mesh surface.