Permo Ecovent is Klober's economy roof underlay solution for pitched roofs. The three-layer, vapour-permeable roof membrane allows the roof structure to breathe and is available with or without self-adhesive tape. The integral self-adhesive tape creates a strong and durable airtight seal to reduce energy loss. Permo Ecovent is BBA approved for non-ventilated cold and warm roofs. Area of application Suitable for non ventilated cold and warm roofs. All wind zones with taped headlap. Wind zones 1-2 with battened headlap. Key Features A lightweight three layer vapour-permeable roofing underlay. BBA approved low resistance membrane. Also available with fitted self-adhesive strips to provide water tightness and strong protection against winds. UV Stable for 4 months.