Permavent METAL uses the very high production methods of Permavent MAX as base layer to which a spiral layer of polypropylene mesh is melt bonded. It is specially design as a moisture and separation layer for all types of standing seam and metal roofs. It is designed to be laid on top of rigid insulation or timber or plywood boarding and is clean, safe and lightweight.
Permavent METAL is designed for use with all types of metal roofs. Permavent METAL incorporates a high performance breather membrane that will help to release water vapour from the building. The addition of the spiral mesh creates a 10mm air gap that allows this moisture to drain of the roof. The air gap also prevents the metal from being in constant contact with this moisture and this helps to protect the metal. The spiral mesh also allows the metal to freely expand and contract and also stops the direct transmission of summer heat and winter cold.
Its high tech design is ideal for roof pitches over 3° and will mask irregularities such as board joins that could deform the metal roof covering.
Permavent METAL allows the metal roof to be installed in the usual manner.
Permavent METAL is fully vapour-permeable, and provides a strong, durable and waterproof barrier.