Vapour Barrier Installation

A vapour barrier, typically made of plastic or foil, prevents moisture from penetrating building walls, floors, ceilings, or roofs, averting condensation and interstitial moisture buildup. While often called vapour retarders due to varying permeability levels, they come in coatings or membranes, with modern options combining multiple functions.

In heating-dominated regions, interior vapour retarders are preferred, while exterior ones suit cooling-dominated areas. However, vapour-open building assemblies, allowing drying inwards or outwards, are increasingly favoured in many regions. Adequate ventilation is crucial, especially since no vapour barrier is completely impermeable.

Properly installed vapour barriers are crucial in residential homes to prevent moisture-related issues like material deterioration and mould growth. They safeguard building materials and maintain structural integrity.