Roof Ventilation Products have been appraised for use as non-structural roof battens and vents for use with pitched and skillion roof construction on buildings within the following scope:

• the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
• with profiled metal roof cladding; and,
• situated in NZS 3604 Wind Zones up to, and including Extra High.

The VENT Vented Batten (VB20) is designed for use on all skillion roof designs irrespective of the roof cladding. It can be used in all climates and weather conditions.

The VENT Vented Batten will fix to the top of the roof purlins, the upper edge of the fascia and underneath the barge flashing, and is compatible with steel and timber purlins.

• Residential skillion roofing and commercial buildings
• Designed to ensure that unimpeded airflow through the roof cavity of a skillion roof design
• Also designed as a purlin vent to allow airflow throughout roof area
• New build or renovation
• VB20 can also be used on walls to create vertical or horizontal ventilation flows 

See BRANZ Appraisal 979

The VENT Vented Batten should be used in conjunction with other VENT products to ensure a complete ventilation system:

• VENT Over Fascia Vent (G2500N)
• VENT Ridge Vent (RV10P) for application on purlin

Additional fixing screw length is required to accommodate 20mm thickness of the VB20.

In the opinion of BRANZ, Roof Ventilation Products, if designed, used, installed and maintained in accordance with the statements and conditions of this Appraisal, will meet or contribute to meeting the following provisions of the NZBC:

• Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2 and B1.3.4. Roof Ventilation Products meet the requirements for loads arising from gravity loads, wind and impact [i.e. B1.3.3 (b), (h) and (j)]
• Clause B2 DURABILITY: Performance B2.3.1 (b) 15 years and B2.3.2. Roof Ventilation Products meet these requirements
• Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. Roof Ventilation Products contribute to meeting this requirement
• Clause E3 INTERNAL MOISTURE: Performance E3.3.1. Roof Ventilation Products contribute to meeting this requirement
• Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. Roof Ventilation Products meet this requirement

See BRANZ Appraisal 979 (2023) for full information.

Passive Ventilation has been used in Canada, America, the United Kingdom and Europe for almost four decades. By introducing passive ventilation into roofs these countries have significantly reduced internal moisture and prevented what was called 'sick home syndrome'.

More recently in New Zealand, since changes to E3:AS1 1.1.4.b of the New Zealand Building Code in 2014, passive ventilation has become more widely understood and the need to ventilate the uninhabited spaces in a building has been more widely acknowledged. Industry experts BRANZ have endorsed passive ventilation as a necessity in Skillion roof types and have recommended that all roof types are passively ventilated as redundancy to eradicate internal moisture.

The NZMRM is currently revising the Metal Roofing Code of Practice to incorporate ventilation into certain roof design and strongly recommending passive ventilation in all metal roof types.  

Since the amendment of E3:AS1 hundreds of New Zealand buildings have incorporated passive ventilation into building design and application, These buildings include MOE school Reroof projects, residential new build and renovations and commercial projects. 

The VENT Ventilated Batten has been sepcified and installed on many Ministry of Education school re-roof projects throughout New Zealand.

• 15 year warranty
• Insect proof — recommended 4mm vents to prevent ingress of nesting insects
• Manufactured in recycled plastic