Created with Eselt - eBay Listing Template Editor eBay.co.uk Give us a call Send us a message Created with Eselt - eBay Listing Template Editor - Our Store - Seller Profile - Feedback - About us - Contact Created with Eselt - eBay Listing Template Editor CROMAR - Rafter Loft Tray Roll Out Eaves Roof Underlay Ventilation 6M x 300,400,600,800mm Roll Introduction: Designed to maintain a flow of air to the roof space from outside. Easy to install system to maintain ventilation between insulation and roofing felt. Simple and economical solution to the problems of eaves ventilation and loft moisture. Free airflow: 25,000mm² per metre. For roof refurbishments or new builds. Suitable for 400mm, 600mm and 800mm raft centres. Complies with.