Airtight Membranes FAQs
What is an airtight membrane and why is it needed?
An airtight membrane is a specialised barrier used in construction to prevent uncontrolled air leakage. It improves energy efficiency, reduces heat loss, and protects insulation from moisture, ensuring long-term building performance.
How does an airtight membrane differ from a breather membrane?
Airtight membranes are designed to stop air leakage and prevent moisture from entering insulation, whereas breather membranes allow moisture vapour to escape while blocking external elements like wind and rain. Both are essential for maintaining a well-sealed and energy-efficient structure.
Where should airtight membranes be installed?
They are typically installed on the warm side of insulation, within walls, roofs, or floors. This placement prevents condensation from forming within insulation layers and enhances thermal efficiency.
Can airtight membranes be used in all types of buildings?
Yes, airtight membranes are suitable for residential, commercial, and industrial buildings. They are especially important in energy-efficient homes, Passivhaus constructions, and buildings that require strict airtightness for compliance with modern building regulations.
Do airtight membranes help reduce heating and cooling costs?
Yes, by preventing unwanted air leakage, airtight membranes help maintain a consistent indoor temperature. This reduces the need for excessive heating in winter and cooling in summer, leading to lower energy bills.
How do airtight membranes contribute to moisture control?
By creating a sealed barrier, airtight membranes prevent moisture-laden air from penetrating insulation and structural components. This helps to reduce the risk of condensation, dampness, and mould growth.
Are airtight membranes required for building regulations compliance?
Many building regulations now require airtightness to meet energy efficiency and sustainability standards. Proper installation of airtight membranes helps buildings achieve the required air permeability levels for compliance.
Can airtight membranes be used in combination with vapour control layers?
Yes, vapour control layers are often used alongside airtight membranes to manage moisture movement while maintaining airtightness. This combination is essential in preventing internal condensation and ensuring insulation performs optimally.
What is the best way to install airtight membranes?
To ensure an effective seal, airtight membranes should be installed with overlapping layers and secured using airtight tapes or adhesives. Sealing around fixings, edges, and junctions is crucial to achieving a fully airtight structure.
