Due to the increasing amounts of insulation required to meet building regulations, there is a need for a more superior eaves ventilation system. The 10mm eaves vent system plus has been specifically produced to meet this requirement. Higher levels of insulation, coupled with lower pitched roofs means a wider rafter roll is often beneficial in order to maintain an air path over the top of the insulation - this new system incorporates a 600mm wide rafter roll, as well as a new and improved heavy duty underlay support tray. The new 10mm eaves vent system plus is part of the Marley universal range and is suitable for use with all of the Marley Eternit tiles & slates, as well as those from other manufacturers. It is quick & easy to install and is BS 5534 compliant, providing a weather-tight eaves vent solution. Kit Contents 6x over fascia ventilators - 10mm.1x continuous rafter roll - 600mm depth.10x felt support trays.Each kit can cover up to 6m.