This 1000mm x 25m Cromar Vent3 Classic Breathable Membrane is created using a triple-layer fabric; the outer layer forms the functional waterproof surface, the middle layer acts as the breathable waterproof membrane, and the inner layer protects the membrane from damage and abrasion, as well as providing some additional strength. This ingenious triple-layer construction means that moisture vapour can pass through, whilst still remaining fully waterproof.

Vent3 Classic is designed to be used as a secondary barrier to wind-driven rain and snow - however, it should NOT be considered a primary waterproofing layer. It has excellent tensile/tear strength and a fantastic level of high wind uplift resistance, ensuring it is equally suitable whether draped unsupported over rafters or laid directly over your insulation.

Key Features

• Long-term durability
• Lightweight and flexibility
• Excellent tensile and tear strength
• Conforms easily to any typical roof configuration
• Designed for use in a fully supported or unsupported tiled, slated or metal roof system
• Equally suitable whether draped unsupported over rafters or laid directly over insulation
• 3-layer membrane allows moisture vapour to pass through whilst remaining fully waterproof
• Made from high tensile spun bonded polypropylene layers, around a micro‐porous polypropylene film

Technical Information

• Weight: 115gsm
• Size: 1000mm X 25m
• UV resistance: 3 months
• Colour: Light grey upper / grey lower
• Water vapour resistance: 0.02 Sd/m

Approvals

• Flame retardancy Class E EN 13501-1
• Zones Compliance BS 5534:2014 + A1:2018