Articles & Case Studies
Articles
From Eaves to Ridge: How a Complete Passive Ventilation System Works
Passive ventilation is most often discussed in terms of compliance: which products meet the code, and for which roof type. That’s an important conversation. But it doesn’t tell the full story.
A System-Based Approached to Managing Moisture for Long-Term Structural Integrity
The durability of a modern building depends on the performance of its envelope. As construction methods evolve to improve thermal efficiency, the risk of trapped moisture within wall and roof cavities increases.
Experts in Passive Ventilation for more than 15 years
From New Zealand to Australia
For more than 15 years, our mission has been centred on a clear and critical goal: To deliver compliant, discreet, and passive ventilation systems that improve building performance, support healthier homes, and make compliance easier for industry professionals.
Fully BAL Compliant Over Fascia Vent Now Available in Australia!
We’re pleased to announce that the G750N BAL Compliant Over-Fascia Vent is now available in Australia! The G750N is engineered to support bushfire compliance while maintaining airflow at the roof edge.
The Hidden Cost of Getting Ventilation Wrong: Defects, Callbacks and Who Wears It.
Most ventilation problems don’t show up at handover. They show up months later, when a homeowner finds mould creeping across a ceiling, or an inspector opens a roof space and finds the underside of the roofing wet to the touch. By then the build is signed off, everyone has moved on, and the question becomes a straightforward one: who pays to fix it?
Navigating Bushfire Ventilation Compliance
Bridging the Gap Between Paper and Performance
In bushfire-prone Australia, ventilation compliance isn’t just about ticking boxes. This article unpacks the gap between certified products and real-world performance, showing how VENT Systems bridges specification, installation, and long-term resilience.
How to Ventilate a Skillion Roof
In skillion roofs the space between purlins and insulation is usually limited to 25mm, meaning airflow below the roofing underlay is extremely restricted.
Wall Cavities Are Now Mandatory in Zones 6, 7 and 8. Here's What That Actually Means.
One of the most significant changes in NCC 2025 isn’t getting nearly enough attention.
From 1 May 2026, buildings in climate zones 6, 7 and 8 now generally need a continuous drained and ventilated cavity behind external wall cladding.
High level vs low level ventilation in buildings
What’s the difference and why both matter.
Good ventilation is simple in theory and unforgiving in practice. Buildings need a reliable path for fresh, cooler air to enter at low level and a clear path for warm, moisture‑laden air to leave at high level.
What Makes a Good Passive Ventilation System? (And How to Tell the Difference)
Not all ventilation is created equal. So how do you know if a passive ventilation system is genuinely good? Here are the qualities that separate systems that work from those that merely tick a box.
Why the VENT Systems 'We Work With' Philosophy Matters
At Vent Systems, we work with everyone.
VENT Systems isn’t just a supplier. We’re a technical partner who works alongside the people who shape, build, and certify construction. Ventilation only works when design, installation, and compliance are aligned – and that only happens when everyone is working together from the start. This collaboration is at the heart of our “We Work With…”
NCC 2025 is Here: What's Actually Changed for Ventilation
The National Construction Code 2025 is now in effect, and while much of this edition focuses on commercial building, it brings significant changes to ventilation and moisture management from NCC2022. If you’re a builder, designer or certifier, here’s what’s actually changed, what hasn’t, and why it matters.
Estimation Service Now Available! Supporting Faster, More Confident Project Planning
We’re excited to introduce our new estimation service, giving builders, project managers, developers, and industry professionals a streamlined way to plan ventilation requirements early and move forward with greater confidence.
VENT Passive Ventilation System Installed on School Skillion Roof
A four product combination from VENT creates passive ventilation for a new extension at Hingaia Peninsula School in Auckland.
Vent's Effective Passive Ventilation System for Pitched Skillion Roofs
Vent’s three product passive ventilation system for pitched skillion roofs ensures constant airflow through the roof space, preventing the build-up of moisture.
VENT Introduces New Deep Trough Ridge Vent
Designed to meet increasing demand for deep trough roof profiles, the new Deep Trough Ridge Vent is compatible with roofs with trough depths from 38 – 48mm.
VENT Passive Ventilation Products Now BRANZ Appraised
VENT is pleased to announce that three of their popular passive ventilation products are now BRANZ appraised.
Why Specify the VB20 Ventilated Batten?
Designed to ensure unimpeded airflow through the roof cavity — particularly important for skillion roofs, the VB20 is a popular ventilation option. Steve Mark from WMZA talks about his experience specifying the batten.
Case Studies
Mould in New Homes
Case study
Mould Assessor Report
Case Study
Insulation Install on Skillion Roof
Case study 1
Mould in Trussed Roof
Case Study 2
Mould in Trussed Roof
Case Study 3
Mould in Buildings
Case Study 7
Articles for the Home Consumer
Choose The Right Roof Ventilation System For Your Home: Tips To Help
With efficient circulation, stale moist air is ventilated outside and fresh air is drawn in. Your insulation works efficiently because it remains dry.
Good Roof Ventilation: An Essential Safeguard For Your Family Home
Is your roof ventilation system adequate for your home? Discover its importance for health and home security.
Roof Ventilation: Discover The Best Solution For Your Home
Our primary aim in roof ventilation is to ensure that stale air is ventilated and fresh air constantly circulates.
When Thinking About Your Ventilation Options, Consider Behaviour Too
If you’re thinking about your home ventilation options, consider a passive ventilation system as well as the behaviour of your home’s occupants.
International Articles
Condensation in Roof Spaces
Building Research Establishment
Ventilating Cold Deck Flat Roofs
Building Research Establishment
Modelling and Controlling Interstitial Condensation in Buildings
Building Research Establishment
Modelling Condensation and Airflow in Pitched Roofs
Building Research Establishment
Remedying Condensation in Domestic Pitched Tiled Roofs
Good Repair Guide
BRANZ Articles
Numerical Simulation of Ventilation in Roof Cavities
BRANZ Study SR343
Ventilation Dries Attic Space
Build 148-78 Research
Combating Internal Moisture
Build 151-46 Feature Internal
Ventilation Options
Build 152-44 Feature Ventilation
A Breath of Fresh Air
Build 152-46 Feature Ventilation
Passive Roof Ventilation
Build 152-54 Feature Ventilation
Measuring Airflows
Build 152-57 Feature Ventilation
Vents in Skillion Roofs
Build 155-78 Research
Roof Ventilation
Build 157-57 Design Science Build
Creating Healthy Learning Spaces
Build 158-46 Feature Schools
Design for Better Learning
Build 158-53 Feature Schools Seismic
Air Pollution in Schools
Build 158-60 Feature Schools
Airflow Through Ceilings
Build 158-82 Research
Cold Roofs? Warm Roofs?
Build 164-78 Research
Too Much Moisture in the Roof
Build 166-93 Research