Where should Vapour Barriers be installed?

Vapour barriers are crucial in managing moisture control within buildings, particularly in areas where temperature differences exist between the interior and exterior environments. The proper installation location for vapour barriers is on the warm side of the insulation. This positioning is important because it helps to prevent warm, moisture-laden air from inside the living spaces of a building from coming into contact with the colder surfaces in walls, ceilings, or roofs, where condensation could occur.

When the warm air cools down upon contact with these colder surfaces, it can result in moisture accumulation, leading to potential issues such as mold growth and structural deterioration over time. By placing the vapour barrier on the warm side, it effectively limits the movement of moisture from the interior into the insulation and structural components, promoting healthier indoor air quality and preserving the integrity of the building materials.

Understanding the right placement for vapour barriers is essential for effective building insulation practices, ensuring energy efficiency, and preventing moisture-related damage.