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Products / Roof Ventilation / Cor-Vent® Roof Ventilation System

Cor-Vent® Roof Ventilation System

We have created a range of products to assist in ventilation and condensation management of roof spaces. Cor-Vent® is a passive roof ventilation system adhering to NCC 2022 ABCB housing Provision Part 10.8.3 & Vol1 F8D5 requirements. Designed to help create airflow pathways to reduce the risk of moisture and condensation within roof spaces.

Cor-Vent® 25K BAL
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Overview Compliance Features Technical Roof Pitch 15°~75° Roof Pitch 0°~15° FAQ’s

Cor-Vent® Standard Pitch – 15°~75° Pitch Roofs – Steel

Compliance & Installation PDF

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NEW Cor-Vent® Low Pitch – 0°~15° Pitch Roofs – Steel

Compliance & Installation PDF

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Cor-Vent® Standard Pitch – 15°~75° Pitch Roofs – Tiles

Compliance & Installation PDF

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Overview

What is Cor-Vent®?

Cor-Vent® is a passive roof ventilation system with compliance to Code NCC 2022 ABCB housing Provision Part 10.8.3 & Vol1 F8D5 requirements. It is designed to help create airflow pathways to reduce the risk of moisture and condensation within roof spaces.

Cor-Vent® Range

We offer both low and high level Cor-Vent® products that cater to various roof pitches from 0°~75°.

Design

Cor-Vent® products are made from Australian made fluted polypropylene board (Corflute®); a robust substrate perfectly suited to roof ventilation requirements.

The Cor-Vent® 8K and 5K products include a 45° cut on both open ends (flute openings). Cor-Vent® 25K product has a 90° cut on both ends. The open ‘flutes’ improves airflow and helps avoid possible blockage from overlapped sarking.

Installation

Cor-Vent® product installations do not require any special tools, training, or major changes to the roof build. Cor-Vent® Installation Guides are included in the Product Information Download Forms above.

Certification

Cor-Vent® meets the DtS airflow opening requirements per NCC 2022, including BAL Zones.

Contact our Cor-Vent® specialists for additional information at building@corex.com.au

Image: Cor-Vent® 8K FR BAL 200. For standard pitch roofs – 15°~75°. Cor-Vent® is Australian designed and made locally from Corflute®. Patent pending: 541217AU

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NCC Compliance Code

Updated roof space ventilation requirements

Cor-Vent® satisfies Compliance Code NCC 2022 ABCB housing Provision Part 10.8.3 & Vol1 F8D5 requirements.

  1. Minimum 20 mm gap maintained between insulation and sarking.
  2. Eave ventilation opening in accordance with Table 10.8.3.
Roof pitch Ventilation openings
< 10° 25,000 mm2/m provided at each of two opposing ends
≥ 10° and < 15° 25,000 mm2/m provided at the eaves and 5,000 mm2/m at high level
≥ 15° and < 75° 7,000 mm2/m provided at the eaves and 5,000 mm2/m at high level, plus an additional 18,000 mm2/m at the eaves if the roof has a cathedral ceiling
NCC Compliance Code

Cor-Vent® Features

General features of the Cor-Vent® range

  • Applies to ventilation requirements for climate zones 6, 7 and 8
  • Designed for roof pitch from 0° to 75°
  • Light weight and engineered from Corflute®
  • Made from recyclable polypropylene (PP)
  • Easy to install and offered in 1.2 & 2.5-meter lengths
  • Can be screwed or bonded to battens or rafters

Smoke index

  • 3 | Heat index: 0

Image: Cor-Vent® Standard 8K 200 for pitch roofs 15°~75°.

Cor-Vent® Technical Data

Criteria Test Method Value
Compression strength AS1301.429S Min 600 kPA
Melting temperature ASTM3418 165ºC
Maximum working temperature 90ºC
Smoke developed index (range 1-10)** AS1530.3 3
Heat evolved index (range 1-10)** AS1530.3 0
Ember protection (BAL) ** AS3959 2mm SS wire mesh

15°~75° Pitch Products

Cor-Vent® Standard Pitch Roofs

15°~75° Pitch – Steel & Tile Roofs 

Roof pitch Ventilation openings
≥15° to ˂75° Exceeds 7000 mm²/m provided at the eaves and 5,000mm²/m at the high level.
Product Opening (mm) Width (mm) Length (mm) Weight (kg) Ventilation minimum Free open area (mm²/m)
Cor-Vent 8K 200 10 200 2500 0.9 8050
Cor-Vent 8K 250 10 250 2500 1.1 8050
Cor-Vent 8K BAL 200 10 200 2500 1.0 8050
Cor-Vent 8K BAL 250 10 250 2500 1.2 8050
Cor-Vent 5K 100 (High Level) 6 100 1200 0.3 5050
Cor-Vent 5K 100 (High Level) 6 100 2400 0.6 5,050
Cor-Vent Ridge (High Level) 40 320 2500 0.9 5,050
  • Cor-Vent 8K meets DTS 7000mm²/m installed along the two longest horizontals calculation based on the longest planned dimension of the roof.
  • Cor-Vent 5K meets DTS 5000mm²/m installed on one side (high level) but typical to install on both sides.

Image: Cor-Vent 8K – Hip Roof. Installed with sarking & clips

Image: Cor-Vent 8K – Hip Roof – Cladding installation

0°~15° Pitch Products

Cor-Vent® Low Pitch Roofs

0°~15° Pitch – Steel Roofs 

Roof pitch Ventilation openings
≥0° to ˂15° Exceeds 25000 mm²/m along the longest building length
Product Opening (mm) Width (mm) Length (mm) Weight (kg) Ventilation minimum Free open area (mm²/m)
Cor-Vent 25K 50 31 50 2500 0.7 25,000
Cor-Vent 25K 100 31 100 2500 1.4 25,000
Cor-Vent 25K BAL 50 31 50 2500 0.7 25,000
Cor-Vent 25K BAL 100 31 100 2500 1.4 25,000
Cor-Vent 5K 100 (High Level) 6 100 1200 0.3 5,050
Cor-Vent 5K 100 (High Level) 6 100 2400 0.6 5,050
Cor-Vent Packer N/A 50 1200 0.12 N/A
Cor-Vent Packer N/A 50 2400 0.24 N/A
  • Cor-Vent 25K meets DTS 25000mm²/m installed along the longest building length and opposite ends for skillion roof < 10°.
  • Cor-Vent 25K meets DTS 25000mm²/m installed along the longest length on low level in conjunction with Cor-Vent 5K on high level for roof pitch < 10°~15°.

Image: Cor-Vent® 25K– Standard version with 10mm packer.

Image: Cor-Vent® 25K FR-BAL

Cor-Vent®

New to Cor-Vent®?Not sure what it is or how it works? Here are some answers and some helpful tips for your roof ventilation questions!

  • What is Cor-Vent®?

    Cor-Vent® is a passive roof ventilation system designed to help create airflow pathways within roof cavities. The range is engineered to support ventilation over fascia, pliable building membrane (sarking) and flashing systems to help reduce the risk of trapped moisture and condensation within roof spaces.

  • What does passive roof ventilation mean?

    Passive roof ventilation uses natural airflow movement rather than powered fans or mechanical systems. Cor-Vent® products are designed to help air move through the roof cavity using natural pressure and temperature differences.

  • Why is roof ventilation important?

    Roof ventilation helps support airflow through roof cavities, which can assist in reducing the build-up of heat, moisture and condensation within the roof space.

  • Can poor roof ventilation cause condensation?

    Poor airflow within a roof cavity can contribute to condensation build-up, particularly when warm internal air meets cooler roof surfaces. Balanced ventilation pathways may help reduce this risk.

  • Does every roof need ventilation?

    Ventilation requirements can vary depending on roof design, insulation, climate zone, roofing materials and building systems. Many modern roof systems benefit from considered airflow design to support moisture management and roof cavity performance.

  • How do I choose the right Cor-Vent® product?
    Cor-Vent® products are designed around different roof pitch ranges and ventilation applications. Product selection typically depends on:
    • roof pitch
    • roof construction
    • ventilation location
    • airflow requirements
    • roof system design
    Corex can help guide product selection based on your application.
  • What roof pitches does Cor-Vent® suit?

    The Cor-Vent® range includes products designed for roof pitches from 0° to 75°.

  • What is the difference between Cor-Vent® 25K, 8K and 5K?
    Each Cor-Vent® product is designed for different airflow and roof pitch applications. Generally:
    • Cor-Vent® 25K supports low pitch roof applications
    • Cor-Vent® 8K suits many standard roof pitch applications
    • Cor-Vent® 5K products support higher-level airflow applications
    Refer to product guides for specific application recommendations.
  • Do I need both low-level and high-level ventilation products?
    Many roof systems perform best when airflow can move both into and out of the roof cavity. Low-level ventilation products support intake airflow, while high-level ventilation products can support airflow movement higher within the roof system. System requirements may vary depending on roof design and building conditions.
  • Can Cor-Vent® be used on low pitch roofs?

    Yes. Cor-Vent® includes solutions specifically designed for low pitch roof applications from 0° to 15°.

  • Where is Cor-Vent® installed?
    Cor-Vent® products are typically installed within roof edge or roof cavity ventilation zones depending on the application and product type. Installation methods may vary depending on roof construction and design.
  • Is Cor-Vent® easy to install?

    Cor-Vent® products are lightweight and designed for practical installation within common roofing systems.

  • Can Cor-Vent® be cut or modified on site?

    Cor-Vent® products are manufactured to suit specific airflow and installation requirements. You can cut Cor-Vent® Strips down to size using a standard box cutter / Stanley knife, but any site modifications should be carefully considered to ensure ventilation performance is maintained.

  • Can Cor-Vent® be used with pliable building membranes (sarking)?

    Yes. Cor-Vent® products are designed to help maintain airflow pathways over pliable building membrane systems.

  • Does Cor-Vent® support NCC2022 roof ventilation requirements?
    Cor-Vent® products are designed to support roof ventilation system design with consideration to NCC 2022 and ABCB housing provision requirements relating to roof space ventilation. Project-specific compliance requirements should always be confirmed by the relevant building professional.
  • Is Cor-Vent® tested?

    Corex products are developed around practical roofing applications and engineered airflow design principles. Please refer to Product Information sheets (Data Sheets) available to download via the product pages on the website for technical data.

    Product suitability should always be assessed against the specific project application. 

  • Does Cor-Vent® stop condensation completely?
    No roof ventilation product can guarantee the elimination of condensation under all conditions. Condensation risk depends on multiple factors including building design, climate, insulation, vapour management and airflow balance. Cor-Vent® products are designed to support airflow pathways that may help reduce moisture build-up risk.
  • What is Cor-Vent® made from?

    Cor-Vent® products are manufactured using Australian-made Corflute® fluted polypropylene board.

  • Is Cor-Vent® durable?

    Corflute® polypropylene board is lightweight, durable and well suited to roofing ventilation applications.

  • Who uses Cor-Vent®?
    Cor-Vent® products are used across residential and commercial roofing applications by:
    • builders
    • roof plumbers
    • roofing contractors
    • distributors
    • specifiers
  • Where can I buy Cor-Vent®?

    Purchase directly from Corex via our website or your contact your local roofing supplier for product availability and supply information.

  • Is Cor-Vent® recyclable?

    Cor-Vent is made from Corflute® polypropylene (PP) material (number 5 recycling symbol) is recyclable through appropriate recycling streams or at Corex Recycling free of charge.

  • Is Cor-Vent® Australian made?

    Yes. Cor-Vent® products are designed and manufactured in Australia by Corex, using Australian-made Corflute® material.

  • Why does passive ventilation matter in modern homes?
    Modern buildings are becoming more airtight and insulated, increasing the importance of considered airflow and moisture management within roof systems.
Cor-Vent®

Get in touch!

Contact our Cor-Vent® specialists for additional information. Email building@corex.com.au

Cor-Vent® Installation Guides can be found in the Product Information Download Forms at the top of this page.

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Melbourne, Victoria
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