Ventilation Ember Guard

Ember Guard

Passive Roof Ventilation for Condensation Management and Bushfire Protection

As buildings become more energy efficient and airtight, effective roof space ventilation has become increasingly important for managing moisture and condensation within the building envelope. Without adequate ventilation, water vapour can accumulate within roof spaces, increasing the risk of condensation, mould growth, corrosion and long-term damage to building materials.

The National Construction Code (NCC) places significant emphasis on roof space ventilation as part of modern condensation management strategies. Ventilation openings play an important role in allowing humid air to escape the roof space while promoting drying of building materials and insulation systems.

In bushfire-prone areas, however, these same ventilation openings can create pathways for ember attack, requiring building designers and installers to balance condensation management requirements with bushfire protection requirements.

Karben Guard® Ventilation Ember Guard has been specifically developed to address both challenges by providing a simple, effective and compliant mesh solution for roof ventilation systems used in bushfire-prone areas.

Why Roof Space Ventilation Matters

Water vapour is constantly generated within buildings through ordinary daily activities including cooking, showering, laundry, heating and occupancy. If this moisture becomes trapped within the building envelope, it can increase relative humidity levels and contribute to condensation within roof spaces and cavities.

The ABCB Condensation in Buildings Handbook identifies ventilation as an important strategy for helping roof spaces dry and reducing the accumulation of moisture that can contribute to mould growth, corrosion and material deterioration.

Modern roof ventilation systems can assist in:

Managing moisture within roof spaces
Reducing condensation risk
Promoting drying of building materials
Improving roof space airflow
Supporting NCC condensation management requirements
Reducing the risk of mould and mildew growth
Improving long-term building durability

Designed for Ventilation and Ember Protection

Karben Guard® Ventilation Ember Guard uses a 1.9mm aperture mesh specifically developed for roof ventilation applications where ember protection is also required.

The product has been designed to integrate with common roof ventilation systems including high-level and low-level ventilation arrangements, ridge ventilation systems and other passive roof ventilation strategies commonly used within modern metal roof construction.

Typical applications include:

Ridge ventilation systems
Eave ventilation systems
High-level roof ventilation
Low-level roof ventilation
Roof cavity ventilation
Ventilated roof systems
Metal roof construction
Residential construction
Commercial construction

1.9mm Stainless Steel Ventilation Ember Guard

For projects requiring a corrosion-resistant steel ember screening solution, Karben Guard® also offers a 1.9mm powder coated stainless steel Ventilation Ember Guard. This product has been developed for ventilation ember protection applications including higher Bushfire Attack Levels where corrosion-resistant steel screening materials may be required.

The stainless steel option may be used in:

When specifying stainless steel mesh, consideration should be given to material compatibility. BlueScope technical guidance identifies stainless steel and zinc/aluminium coated steel materials as generally incompatible in direct contact due to the potential for galvanic corrosion of the less noble metal. Designers and installers should always review material compatibility and installation requirements when incorporating stainless steel mesh into roof ventilation systems.

1.9mm Aluminium Ventilation Ember Guard

Karben Guard® Ventilation Ember Guard is available in both aluminium and stainless steel mesh options, providing solutions for a broad range of Bushfire Attack Levels (BAL) and project requirements.

Manufactured from coated corrosion-resistant aluminium mesh, the aluminium option has been specifically developed for roof ventilation and ember protection applications up to BAL-29.

1.9mm aperture mesh
Coated corrosion-resistant aluminium
Approximately 63% open area
Compatible with COLORBOND® steel roofing systems
Compatible with TRUECORE® steel framing systems
Manufactured locked edges for safer handling and installation

The product provides a simple and cost-effective solution for incorporating passive ventilation into roof systems while maintaining ember protection requirements for bushfire-prone construction.