Cromar Vent 3 135g Breathable Felt Membrane Roofing - 1.0m x 50m Blue
BBA approved for use in Warm and Cold, Ventilated and Non Ventilated Roofs. Certified for use in warm and cold, ventilated and non-ventilated roofs. Water Vapour Resistance: 0.16. Water Vapour Transmission: 1258.