Vapour control layers help manage moisture movement within the roof build-up and form an important part of condensation control in flat roof construction. Sika's Sarnavap® range includes polyethylene and self-adhesive vapour control layers designed for compatibility with single ply roofing systems, providing high vapour resistance and supporting long-term roof performance across a variety of roof designs and deck types.
Our Range of Vapour Control Layers
FAQ
A vapour control layer is a membrane installed within the roof build up to prevent warm, moist air from inside a building from reaching colder areas, where it could condense and cause damage such as rot, mould or insulation failure.
Vapour control layers play a vital role in protecting the roof structure and insulation. By controlling moisture movement, they help preserve the performance and lifespan of the roofing system, especially in buildings with high internal humidity levels.
Not necessarily. Whether a vapour control layer is needed depends on factors such as building use, internal humidity, insulation type and roof design. For guidance, contact one of our technical advisors here to evaluate your project’s specific requirements.
Yes, Sika vapour control layers are designed to be fully compatible with both PVC and FPO single ply membranes, ensuring long term performance of the full roofing system.
