Build better with Vent.

H1 AND INTERNAL MOULD. IF YOU’RE NOT ALREADY THINKING
ABOUT IT, YOU SHOULD BE.

Passive Roof Ventilation Systems

Trussed Roof Pitch >30°

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Trussed Roof Pitch 15°- 30°

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Trussed Roof Pitch <15°

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Trussed Mono Pitch Roof >15°

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H1 regulations carry risk of cavity mould.

Airtight homes are good for our health. But, the health of our builds depends on ventilation.

Our dramatic temperature decreases overnight create moisture from the hot air circulating around the roof and wall cavities of our homes with nowhere go. As the day cools, that hot air turns into condensation, settling into insulation and resulting in mould.

Overseas, passive ventilation to complement airtight, energy efficient homes has been standard in the building code for years, and is currently being mandated in Australia too. They are following Europe and America to incorporate cavity ventilation into weathertight builds to allow their homes to breathe.

Reduce the risk of cavity mould by installing a Vent passive ventilation system in your next build.

Airtight home with ventilation

Airtight home without ventilation

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Testimonial

Having entered into the new H1 Insulation changes to the building code, venting roof spaces is more important than ever.

Working with the team at Vent and learning about their passive roof space ventilation products has been invaluable.

Feedback from our builders has been positive, as they have found the products quick and easy to install.

Vince

Jennian Homes Franklin

Passive Ventilation is low cost & easy to install.

Protect your build’s integrity (and your reputation).

You can mitigate your liability, and offset your costs.

VENT IS A SIMPLE, COST EFFECTIVE WAY TO BUILD BETTER.

For builders installing passive roof ventilation in New Zealand, the affordability factor is important. With a focus on building better while keeping costs in check, passive Vent ventilation systems offer a compelling value proposition.

Vent systems have a bespoke solution that reduces your build’s heel height while achieving compliance with NZS 4246:2016, offsetting the cost of adding ventilation and protecting your liability against potential mould damage. By installing a Vent baffle you can offset the cost of your ventilation system by reducing your cladding costs.

HOW?

The new H1 insulation requirements mean added heel height in order to create enough space for thicker insulation. Added heel height means extra cladding costs.

The Baffle is a custom designed Vent product that allows you to build to the previous standard heel height and still be building code compliant, saving you cladding costs and creating a more insulated home.

The baffle slightly compresses insulation allowing you to fill to the very edge of the roof ridge and across the top plate, reducing thermal bridging and creating a more robustly insulated home.

EAVES BAFFLE – G502

Vent-Roll G502
THE MONEY YOU’VE SAVED IN HEEL HEIGHT COSTS CAN BE REINVESTED INTO VENTILATION.
The money you’ve saved in heel height costs can be reinvested into ventilation. Eliminating the need to add heel height to your roof means reducing the cladding costs of your build.

Installing a full ventilation system and baffle means your build is well insulated throughout the entire roof space, and has air flow to ensure your build isn’t prone to mould/moisture build up through condensation, and best of all, the costs of your ventilation are normally offset by the reduced cladding requirements.

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Get in touch

If you want more information or have a general enquiry, please fill in our form and we’ll get back to you as soon as we can.

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Distributed by DriSpace.

Our products are conveniently stocked all over New Zealand, distributed by our exclusive brand partner, DriSpace.

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Available Locally.

See below our list of trusted suppliers distributing nation wide online or instore, or orders are available through our brand partner DriSpace.

Frequently Asked Questions

FAQs – General:

What is Passive Ventilation?
Simply put, Passive ventilation is a method of allowing continuous, calculated, unimpeded airflow above the thermal envelope of a building with the objective of eliminating condensation by removing warm moist air from the roof voids of wall cavities.
Why do we need to passively ventilate?
Increased focus on energy efficiency, heating and insulation has led to “tighter” building construction. As buildings become more airtight, buildings are unable to breath and expel moisture that enters the building through various means. If moisture is not expelled from the building it can lead to condensation which can be detrimental both to the building and to its occupants. The build p of condensation in a building can lead to the decay of building products and create an environment for toxic moulds to thrive.
Is it a proven solution?
Yes. Passive Ventilation has been tried and tested across Europe & USA covering the most extreme climatic conditions for decades. Using proven methodologies Passive Ventilation has now been successfully incorporated into New Zealand building design dating back to 2015.
What is the difference between mechanical and passive ventilation and is there a need to passively ventilate a mechanical system is installed?
Many mechanical ventilation products focus mainly on the ventilation of habitable areas. It is common for many of these systems to have extraction vents in the habitable areas of the building that terminate in the roof space. The result of this is that the condensation from the habitable areas of the building are literally transferred into the roof cavity. It is imperative that any moisture has the ability to exit or escape the roof cavity. Whilst most mechanical ventilation companies offer systems that bypass the roof cavity, whilst these are preferable options, they still only deal with moisture in the habitable areas of the building. They do not deal with moisture that is created in the roof cavity itself. Leaving this moisture in the roof cavity it can very quickly create the ideal habitat for toxic moulds.
Will passively ventilating a roof cavity compromise the thermal efficiency of my insulation?
In principle, passively ventilating will not compromise the thermal efficiency of insulation. Despite reducing the air temperature above the insulation, by creating air movement and allowing moist air to escape the roof cavity, passively ventilating safeguards the thermal qualities of insulation which may be compromised should they become wet. However, as the thermal ratings of insulation will vary depending on the R-Ratings, the product supplier etc. it is always recommended to check with your insulation provider first.
Does every roof require passive ventilation?
It is our strong recommendation that ever roof should be passively ventilated. This is not to say that ever roof will experience internal moisture issues, however every roof that is not passively ventilated may suffer from internal moisture issues depending on a number of factors. By passively ventilating the roof space, you mitigate being exposed to internal moisture and associated issues.
How costly is it to passively ventilate my roof space?
When compared with mechanical ventilation systems, passive ventilation is relatively cheap and inexpensive as there are no ongoing running or maintenance costs after the initial install. The installation costs themselves depend on the roof design and the product combinations required.

FAQs – Product:

Does the VB20 sit on the top of building paper or under?
When used on the roof, the VB20 can be placed on top of the paper or underneath, depending on the type of roof construction.

When constructing a typical cold roof using a single membrane it is recommended to create ventilation by placing the VB20 on top of the purlin UNDERNEATH the roofing membrane. If however a warm roof construction is being constructed using a double membrane application then the airflow needs to be created above the upper membrane whereby the VB20 is placed ABOVE the upper membrane.

What’s the gap between RV10P and Ridge cap?
The ridge cap sits directly on top of the RV10P or RV10DT Ridge Vents. The ridge capping should extend beyond the width of the vent (excluding the aluminium soft edge) by no less than 20mm to ensure that the vent is not impeded by the ridge capping.
In order to cover the aluminium soft edge it is recommended to make the ridge capping to a minimum of 250mm with a drop down of 15mm. This will ensure that the aluminium soft edge is covered.
Is RV10P tape supposed to protrude beyond the ridge cap?
It can, however, for aesthetic reasons we recommend increasing ridge cap from 200mm to 250mm to cover tape.
What’s the deepest trough RV10DT can work on?
The RV10DT has been tested to a trough depth of 50mm. Please note however that when applying the RV10DT to a deep trough profile snipping will be required. One should take care during the application process to not force the flashing tape beyond it’s intended use, as this may cause the tape to break away from the vent.
What over fascia vent do you apply to a roof of under 15°?
For any trussed roof with a roof pitch less than 15° a G2500N VENT Over Fascia Vent should be applied. For any skillion roof, irrespective of the pitch of the roof a G2500N VENT Over Fascia Vent is recommended.

The G2500N is designed to allow a calculated airflow of 25,000mm² per linear metre into the roof cavity. The smaller or tighter the roof cavity the more airflow is required.

Is it better to ventilate through the soffit or over the fascia and do VENT offer soffit strip vent in their product range?
VENT products allow a calculated airflow into the roof cavity whether it be through the soffit or over the fascia. Over Fascia Vents are generally recommended as a ‘first choice’ in view of the fact that they are easier to install, mores aesthetically pleasing and will not allow the ingress of moisture when soffits are being cleaned.

VENT is however currently in the design phase of a soffit strip which can easily be applied to both new build or existing buildings.

Do VENT products (RV10) perform well in strong wind areas?
VENT Ridge Vent, Apron Vent and Vented Battens are BRANZ appraised for High Wind Zones. Please refer to VENTS BRANZ Appraisal 979 in our technical literature.

All other VENT products have long history of use in countries with high wind zones comparable to those experienced in New Zealand.