Basements are continuously subjected to moisture whether from the soil outside a basement or condensation inside a basement. Even when you can’t see it, water vapour can leak through walls and floors gradually ruining insulation, drywall and flooring. That’s where vapor barriers come in - vapor barriers are the hidden protectors that every basement needs.
A vapor barrier is a layer of material, typically a plastic or foil, that is used to prevent moisture from passing through walls or floors. By preventing the movement of vapour, it’s helpful to keep interior finishes dry and unspoiled by mould or rot. Without it homeowners may find peeling paint, soggy carpets, or over time the smell that is unmistakable - musty.
These barriers are typically put in place behind walls, under flooring or around insulation. When used in conjunction with adequate sealing and drainage they form an integrated system of defence against moisture.
The choice of the type of vapour barrier to be used depends on the plan of the renovation to be carried out. Thicker sheets of polyethylene are common for walls and floors, while specialised paints or coatings may be used as barriers in some cases, as well.
Conclusion
Vapour barriers might be out of sight but their effects are undeniable. They protect materials, preserve the air quality and prolong the life of a basement renovation. In a space where moisture is always an issue, vapour barriers are not an option - they’re a necessity.