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 Vent 3 BBA Underlay Breathable Roofing Felt Membrane Blue – 1m x 50m Roll DESCRIPTION: Vent3 is a heavy weight, triple layer fabric, high performance breather membrane, made from high tensile spun bonded polypropylene layers, around a micro-porous polypropylene film. Designed for use as a universal breather membrane for roofs and walls boasting superior moisture vapour permeability. Vent3 has a printed blue upper surface with preprinted marking lines and a white under-face.