At EKA Spray Foam Insulation, we understand that protecting your home or business from moisture is just as important as keeping it warm. That’s why we’re here to answer one of the most common questions we hear: Do I need a vapour barrier with spray foam insulation? The answer depends on your project, your climate, and the type of spray foam you choose. Let’s break it down so you can make an informed decision with confidence.

What Is a Vapour Barrier?

A vapour barrier is a material designed to prevent water vapour from passing through walls, floors, or ceilings. By blocking moisture movement, it helps avoid issues like condensation, mould growth, and structural damage. Traditionally, vapour barriers are made from plastic sheeting or foil and are installed separately from insulation. However, with modern insulation solutions like spray foam, the need for a separate vapour barrier isn’t always a given.