There are many product options which will provide passive ventilation for new build and existing homes. As this is a relatively new concept to New Zealand, we have recommended the following range of product options as a simple and effective guideline.
The products have been selected to achieve the recommended airflow for roof pitches above 15° (10,000mm2 lin/m) and below 15° (25,000 mm2 lin/m).
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The Manthorpe G502 Roll Panel Vent is designed to maintain a continuous 25mm air gap between the underside of the roofing membrane or sarking board and loft insulation at the eaves, providing a consistent flow of air into the roof space.
The castellated profile is laid across the top of the roof trusses/rafters parallel with the eaves level and is suitable for both new build and roof renovation projects. The extra width of the panel allows for better coverage when low pitch and deep insulation details are encountered.
The Manthorpe G502 Roll Panel Ventilator (A) should be rolled out over the full length of the eaves and adjusted to align with the required roof truss centres then nailed or stapled to secure in position.
This product should be used in conjunction with other soffit/fascia vents to provide a complete roof ventilation system.
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