A Self-Adhesive Vapour Control Layer (also called a VCL) is a type of bitumen felt that is used quite often in roofing and construction projects. It is mainly used to control the movement of moisture in a building and protect the structure from damage throughout the years. In this article, we will discuss:

• What does a vapour control layer do?
• Why is a vapour control layer beneficial?
• Wonderbuilds Self-Adhesive Vapour Control Layer

What does a vapour control layer do?

Vapour Control Layers can stop warm, moist air from passing through walls or roofs and condensing inside the structure. Condensation might seem like a small issue at first, but over time it can lead to serious and problems that would cost money to solve. If moisture is trapped in a building, it can weaken materials and reduce how effective the insulation works. A Self-Adhesive Vapour Control Layer can be installed either as part of an insulation system or as a separate layer. When insulation is fitted inside a roof or wall, the VCL should always be placed on the warm side of the insulation. This helps prevent moisture from getting into colder areas where condensation is more likely to form, and it will keep the structure dry and protected.

Why is a vapour control layer beneficial?

Preventing mould and condensation

Roofing structures can develop mould and condensation if nothing is done to prevent this from happening. Vapour Control Layers are especially useful in areas with high humidity, such as bathrooms, kitchens, and laundry rooms. They are also commonly installed in public buildings like swimming pools, where moisture levels are consistently high.

Health benefits

Mould can also negatively impact the quality of the air inside the building, and the health of people inside the building. If a Self-Adhesive Vapour Control Layer is installed, it can significantly reduce the risk of these issues.

New Builds and Refurbishments

Vapour Control Layers are usually required in new-build projects as part construction standards. However, they are also very beneficial when refurbishing or upgrading existing buildings, especially when roofs are being replaced.

Wonderbuilds Self-Adhesive Vapour Control Layer

Wonderbuilds offers a Self-Adhesive Vapour Control Layer. This product offers excellent flexibility and is quick and easy to install. Wonderbuilds also provides complete built-up roofing systems that include a Self-Adhesive Vapour Control Layer and come with a 25-year guarantee. The systems can be used for flat roofs.