From Klober
Roll Out Rafter trays are a simple but effective way of preventing loft insulation from being pushed up to the underside of the roofing underlay and will maintain a clear ventilation path into the roof void from the eaves. The rafter trays will be suitable for 10,000 mm2/m or 25,000 mm2/m continuous eaves ventilation. Area of application Suitable for roofs with a pitch over 12.5°. 300-600mm rafter centres. Key Features Available in four widths. Quick and easy to install. Lightweight and durable.