When using spray foam insulation, what is essential to meet vapour barrier requirements?

When using spray foam insulation, the thickness of the insulation is essential to meet vapour barrier requirements because the effectiveness of a vapour barrier is directly related to the material's ability to resist moisture penetration. For spray foam to function as a proper vapour barrier, it must be applied at a specific thickness that conforms to building codes and industry standards. If the foam is too thin, it may not adequately prevent moisture from passing through, potentially leading to issues like mold growth or structural damage.

The application method and type of foam could contribute to overall insulation performance, but they do not specifically dictate whether the vapour barrier requirements are met. While temperature during application can affect the curing and adhesion of the foam, it is the thickness that is critical in ensuring it effectively acts as a vapour barrier. Thus, ensuring the spray foam insulation is applied at the appropriate thickness is crucial for compliance with vapour barrier regulations.