Vapour Barrier

Breathable membranes are a type of building product that are used to improve the energy efficiency and comfort of buildings. These membranes are designed to allow moisture vapor to pass through while preventing the entry of liquid water. They are typically installed on the exterior side of the building envelope, such as under the roof or behind the exterior cladding, to protect the structure from moisture damage.

Vapour barriers, on the other hand, are building products that are used to prevent the movement of moisture vapor through the building envelope. They are typically installed on the warm side of the insulation, such as on the interior walls or ceilings, to prevent condensation and moisture-related issues. Vapour barriers are impermeable to moisture vapor and help to maintain a controlled indoor environment.

Both breathable membranes and vapour barriers play important roles in managing moisture in buildings. While breathable membranes allow moisture vapor to escape, vapour barriers prevent its entry. Together, they help to create a balanced and healthy indoor environment by controlling moisture levels and preventing the growth of mold and mildew.