Our range of airtight membranes for vapour control and airtightness. Airtight membranes are used to ensure airtightness of a building by preventing draught and heat loss. They also help reduce structural damage from occurring over time by preventing damp and mould growth in the building fabric. Overlapping membranes need to be sealed together using airtight tape in order to create one continuous airtight layer. We offer a range of airtight membranes which enable airtightness and vapour control in roof and wall connections, with products from Gerband and our own Passive House Systems range.