Cromar Vent 3 Breathable Roofing Underlay - 1m X 50m, Blue, BBA Certified, UK Made

Planning a roof job? The Cromar Vent 3 underlay makes things easier. It’s a high-performance breathable membrane, so you don’t need extra ventilation gaps – works for both cold and warm roof setups. The roll is 1 meter wide and 50 meters long (blue color, easy to spot). Made in the UK from spun-bonded polypropylene, it’s strong, tear-resistant, and handles weather like a champ. It’s BBA certified, so you know it meets strict building standards. Clean to handle and simple to install. Whether you’re re-roofing a shed, extension, or whole house, this underlay helps protect the structure while letting moisture escape. A reliable choice for pros and confident DIYers alike.